diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2203d5e..41cf88f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -38,8 +38,8 @@ set(TENMON_SRC
     histogram.cpp histogram.h
     imageinfo.cpp imageinfo.h
     imageringlist.cpp imageringlist.h
-    imagescrollarea.cpp
-    imagescrollareagl.cpp imagescrollareagl.h
+    imagescrollarea.cpp imagescrollarea.h
+    imagewidget.h imagewidget.cpp
     loadrunable.cpp loadrunable.h
     main.cpp
     mainwindow.cpp mainwindow.h
diff --git a/filesystemwidget.h b/filesystemwidget.h
index 52b8c9c..6483407 100644
--- a/filesystemwidget.h
+++ b/filesystemwidget.h
@@ -14,8 +14,9 @@ class FilesystemWidget : public QWidget
 public:
     explicit FilesystemWidget(QAbstractItemModel *model, QWidget *parent = nullptr);
     void contextMenuEvent(QContextMenuEvent *event) override;
-private slots:
+public slots:
     void selectFile(int row);
+protected slots:
     void fileClicked(const QModelIndex &index, const QModelIndex &);
 signals:
     void fileSelected(int row);
diff --git a/imagescrollarea.cpp b/imagescrollarea.cpp
index 1bed5d2..b350db3 100644
--- a/imagescrollarea.cpp
+++ b/imagescrollarea.cpp
@@ -1,121 +1,148 @@
 #include "imagescrollarea.h"
-#include <QMouseEvent>
-#include <QScrollBar>
-#include <QKeyEvent>
-#include <QPalette>
+#include "imageringlist.h"
 #include <QDebug>
+#include <QKeyEvent>
+#include <QGridLayout>
+#include <QMimeData>
+#include <QMessageBox>
+#include <QCoreApplication>
+#include <QPainter>
+#include <QFileInfo>
+#include <QScrollBar>
+#include <cmath>
 
-ImageScrollArea::ImageScrollArea(QWidget *parent) : QScrollArea(parent),
-    m_scale(-1)
+ImageScrollArea::ImageScrollArea(Database *database, QWidget *parent) : QWidget(parent)
 {
-    m_label = new QLabel(this);
-    setWidget(m_label);
-    setAlignment(Qt::AlignCenter);
-    setBackgroundRole(QPalette::Dark);
+    QGridLayout *layout = new QGridLayout(this);
+    setLayout(layout);
+
+    ImageWidgetGL *imageWidgetGL = new ImageWidgetGL(database, this);
+    m_imageWidget = imageWidgetGL;
+
+    m_verticalScrollBar = new QScrollBar(Qt::Vertical, this);
+    m_horizontalScrollBar = new QScrollBar(Qt::Horizontal, this);
+
+    layout->setSpacing(0);
+    layout->addWidget(dynamic_cast<ImageWidgetGL*>(m_imageWidget), 0, 0);
+    layout->addWidget(m_verticalScrollBar, 0, 1);
+    layout->addWidget(m_horizontalScrollBar, 1, 0);
+
+    connect(m_verticalScrollBar, SIGNAL(valueChanged(int)), this, SLOT(scrollEvent()));
+    connect(m_horizontalScrollBar, SIGNAL(valueChanged(int)), this, SLOT(scrollEvent()));
+
+    if(imageWidgetGL)
+    {
+        connect(imageWidgetGL, &ImageWidgetGL::fileDropped, this, &ImageScrollArea::fileDropped);
+        connect(imageWidgetGL, &ImageWidgetGL::status, this, &ImageScrollArea::status);
+        connect(imageWidgetGL, &ImageWidgetGL::scrollBarsUpdate, this, &ImageScrollArea::updateScrollbars);
+    }
 }
 
-void ImageScrollArea::setImage(const QPixmap &img)
+ImageScrollArea::~ImageScrollArea()
 {
-    m_pixmap = img;
-    QPixmap pix;
-    if(m_scale < 0)
-        pix = img.scaled(size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
+
+}
+
+void ImageScrollArea::allocateThumbnails(const QStringList &paths)
+{
+    m_imageWidget->allocateThumbnails(paths);
+}
+
+void ImageScrollArea::showThumbnail(bool enable)
+{
+    m_imageWidget->showThumbnail(enable);
+}
+
+void ImageScrollArea::setBayerMask(int mask)
+{
+    m_imageWidget->setBayerMask(mask);
+}
+
+void ImageScrollArea::updateScrollbars(int valueH, int stepH, int maxH, int valueV, int stepV, int maxV)
+{
+    if(maxH > 0)
+    {
+        m_horizontalScrollBar->show();
+        m_horizontalScrollBar->setRange(0, maxH);
+        m_horizontalScrollBar->setPageStep(stepH);
+        m_horizontalScrollBar->setValue(valueH);
+    }
     else
-        pix = img.scaled(img.size() * m_scale, Qt::KeepAspectRatio, Qt::SmoothTransformation);
+        m_horizontalScrollBar->hide();
 
-    m_label->setPixmap(pix);
-    m_label->resize(pix.size());
-
-    horizontalScrollBar()->setValue(horizontalScrollBar()->maximum() / 2);
-    verticalScrollBar()->setValue(verticalScrollBar()->maximum() / 2);
-}
-
-void ImageScrollArea::setScale(float scale)
-{
-    if(scale > 4 || (scale < 0.2 && scale > 0) || m_pixmap.isNull())
-        return;
-
-    m_scale = scale;
-    QSize newSize = m_scale < 0 ? size() : m_pixmap.size()*scale;
-    m_label->setPixmap(m_pixmap.scaled(newSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
-    m_label->resize(newSize);
+    if(maxV > 0)
+    {
+        m_verticalScrollBar->show();
+        m_verticalScrollBar->setRange(0, maxV);
+        m_verticalScrollBar->setPageStep(stepV);
+        m_verticalScrollBar->setValue(valueV);
+    }
+    else
+        m_verticalScrollBar->hide();
 }
 
 void ImageScrollArea::zoomIn()
 {
-    if(m_scale < 0)
-        m_scale = (float)size().width()/m_pixmap.size().width();
-
-    setScale(m_scale + 0.1);
+    m_imageWidget->zoom(1);
 }
 
 void ImageScrollArea::zoomOut()
 {
-    if(m_scale < 0)
-        m_scale = (float)size().width()/m_pixmap.size().width();
-
-    setScale(m_scale - 0.1);
+    m_imageWidget->zoom(-1);
 }
 
 void ImageScrollArea::bestFit()
 {
-    setScale(-1);
+    m_horizontalScrollBar->hide();
+    m_verticalScrollBar->hide();
+    m_imageWidget->bestFit();
 }
 
 void ImageScrollArea::oneToOne()
 {
-    setScale(1);
+    m_imageWidget->zoom(0);
 }
 
-void ImageScrollArea::keyPressEvent(QKeyEvent *event)
+void ImageScrollArea::imageLoaded(Image *image)
 {
-    event->ignore();
-}
-
-void ImageScrollArea::keyReleaseEvent(QKeyEvent *event)
-{
-    event->ignore();
-}
-
-void ImageScrollArea::mouseMoveEvent(QMouseEvent *event)
-{
-    QPoint delta = m_lastPos - event->pos();
-    horizontalScrollBar()->setValue(horizontalScrollBar()->value() + delta.x());
-    verticalScrollBar()->setValue(verticalScrollBar()->value() + delta.y());
-    m_lastPos = event->pos();
-}
-
-void ImageScrollArea::mousePressEvent(QMouseEvent *event)
-{
-    m_lastPos = event->pos();
-}
-
-void ImageScrollArea::resizeEvent(QResizeEvent *event)
-{
-    if(m_scale < 0 && !m_pixmap.isNull())
+    if(image && image->rawImage())
     {
-        m_label->setPixmap(m_pixmap.scaled(event->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation));
-        m_label->resize(event->size());
+        m_imageWidget->setImage(image->rawImage(), image->number());
+        m_imageWidget->setWCS(image->info().wcs);
     }
-    QScrollArea::resizeEvent(event);
 }
 
-void ImageScrollArea::wheelEvent(QWheelEvent *event)
+void ImageScrollArea::thumbnailLoaded(const Image *image)
 {
-    if(m_scale < 0)
-        m_scale = (float)size().width()/m_pixmap.size().width();
-
-    QPointF top(horizontalScrollBar()->value(), verticalScrollBar()->value());
-    QPointF mousePos = (top + event->position()) / m_scale;
-
-    QPoint delta = event->angleDelta();
-    if(delta.y() > 0)
-        setScale(m_scale + 0.1);
-    else
-        setScale(m_scale - 0.1);
-
-    mousePos *= m_scale;
-    top = mousePos - event->position();
-    horizontalScrollBar()->setValue(top.x());
-    verticalScrollBar()->setValue(top.y());
+    m_imageWidget->thumbnailLoaded(image);
+}
+
+void ImageScrollArea::setMTFParams(const MTFParam &params)
+{
+    m_imageWidget->setMTFParams(params);
+}
+
+void ImageScrollArea::invert(bool enable)
+{
+    m_imageWidget->invert(enable);
+}
+
+void ImageScrollArea::superPixel(bool enable)
+{
+    m_imageWidget->superPixel(enable);
+}
+
+void ImageScrollArea::falseColor(bool enable)
+{
+    m_imageWidget->falseColor(enable);
+}
+
+QImage ImageScrollArea::renderToImage()
+{
+    return m_imageWidget->renderToImage();
+}
+
+void ImageScrollArea::scrollEvent()
+{
+    m_imageWidget->setOffset(m_horizontalScrollBar->value(), m_verticalScrollBar->value());
 }
diff --git a/imagescrollarea.h b/imagescrollarea.h
index 2f5822f..6ddb6f2 100644
--- a/imagescrollarea.h
+++ b/imagescrollarea.h
@@ -1,32 +1,41 @@
 #ifndef IMAGESCROLLAREA_H
 #define IMAGESCROLLAREA_H
 
-#include <QScrollArea>
-#include <QLabel>
+#include "imagewidget.h"
 
-class ImageScrollArea : public QScrollArea
+class ImageScrollArea : public QWidget
 {
     Q_OBJECT
-    QPoint m_lastPos;
-    QLabel *m_label;
-    QPixmap m_pixmap;
-    float m_scale;
+    QScrollBar *m_verticalScrollBar;
+    QScrollBar *m_horizontalScrollBar;
+    ImageWidget *m_imageWidget;
 public:
-    explicit ImageScrollArea(QWidget *parent = 0);
-    void setImage(const QPixmap &img);
-    void setScale(float scale);
+    explicit ImageScrollArea(Database *database, QWidget *parent = nullptr);
+    ~ImageScrollArea();
+
+    void allocateThumbnails(const QStringList &paths);
+    void showThumbnail(bool enable);
+    void setBayerMask(int mask);
+protected:
+    void updateScrollbars(int valueH, int stepH, int maxH, int valueV, int stepV, int maxV);
 public slots:
     void zoomIn();
     void zoomOut();
     void bestFit();
     void oneToOne();
-protected:
-    void keyPressEvent(QKeyEvent *event) override;
-    void keyReleaseEvent(QKeyEvent *event) override;
-    void mouseMoveEvent(QMouseEvent *event) override;
-    void mousePressEvent(QMouseEvent *event) override;
-    void resizeEvent(QResizeEvent *event) override;
-    void wheelEvent(QWheelEvent *event) override;
+    void imageLoaded(Image *image);
+    void thumbnailLoaded(const Image *image);
+    void setMTFParams(const MTFParam &params);
+    void invert(bool enable);
+    void superPixel(bool enable);
+    void falseColor(bool enable);
+    QImage renderToImage();
+protected slots:
+    void scrollEvent();
+signals:
+    void fileDropped(const QString &path);
+    void status(const QString &value, const QString &pixelCoords, const QString &celestialCoords);
+    void scrollBarsUpdate(int valueH, int stepH, int maxH, int valueV, int stepV, int maxV);
 };
 
 #endif // IMAGESCROLLAREA_H
diff --git a/imagescrollareagl.cpp b/imagewidget.cpp
similarity index 84%
rename from imagescrollareagl.cpp
rename to imagewidget.cpp
index d7f8925..1b656f4 100644
--- a/imagescrollareagl.cpp
+++ b/imagewidget.cpp
@@ -1,21 +1,15 @@
-#include "imagescrollareagl.h"
-#include <QOpenGLFunctions>
-#include <QOpenGLVersionFunctionsFactory>
-#include <QDebug>
-#include <QKeyEvent>
-#include <QOpenGLDebugLogger>
-#include <QOpenGLPixelTransferOptions>
-#include <QOpenGLFramebufferObject>
-#include <QGridLayout>
-#include <QMimeData>
-#include <QMessageBox>
+#include "imagewidget.h"
 #include <QCoreApplication>
-#include <QPainter>
-#include <QFileInfo>
-#include <cmath>
+#include <QMessageBox>
+#include <QTimer>
 #include <QElapsedTimer>
-#include <QFloat16>
-#include <lcms2.h>
+#include <QOpenGLFramebufferObject>
+#include <QOpenGLExtraFunctions>
+#include <QOpenGLDebugLogger>
+#include <QMimeData>
+#include <QDragEnterEvent>
+#include <QPainter>
+#include "imageringlist.h"
 
 int FILTERING = 1;
 bool OpenGLES = false;
@@ -74,8 +68,8 @@ RawImageType getRawImageType(const RawImage *img)
     return type;
 }
 
-ImageWidget::ImageWidget(Database *database, QWidget *parent) : QOpenGLWidget(parent)
-  , m_database(database)
+ImageWidgetGL::ImageWidgetGL(Database *database, QWidget *parent) : QOpenGLWidget(parent)
+    , m_database(database)
 {
     setFocusPolicy(Qt::ClickFocus);
     m_updateTimer = new QTimer(this);
@@ -87,19 +81,19 @@ ImageWidget::ImageWidget(Database *database, QWidget *parent) : QOpenGLWidget(pa
         if(!isValid())
         {
             QMessageBox::critical(this, tr("OpenGL error"), tr("Could not initialize OpenGL 3.3 context. Ensure that proper GPU driver is installed."));
-             QCoreApplication::exit(-1);
+            QCoreApplication::exit(-1);
         }
     });
 
     setMouseTracking(true);
 }
 
-ImageWidget::~ImageWidget()
+ImageWidgetGL::~ImageWidgetGL()
 {
     makeCurrent();
 }
 
-void ImageWidget::setImage(std::shared_ptr<RawImage> image, int index)
+void ImageWidgetGL::setImage(std::shared_ptr<RawImage> image, int index)
 {
     m_currentImg = index;
 
@@ -174,12 +168,12 @@ void ImageWidget::setImage(std::shared_ptr<RawImage> image, int index)
     else setOffset(m_dx, m_dy);
 }
 
-void ImageWidget::setWCS(std::shared_ptr<WCSData> wcs)
+void ImageWidgetGL::setWCS(std::shared_ptr<WCSData> wcs)
 {
     m_wcs = wcs;
 }
 
-void ImageWidget::zoom(int zoom, const QPointF &mousePos)
+void ImageWidgetGL::zoom(int zoom, const QPointF &mousePos)
 {
     m_bestFit = false;
     if(zoom != 0)
@@ -203,14 +197,14 @@ void ImageWidget::zoom(int zoom, const QPointF &mousePos)
     setOffset(m_dx * r + focus.x() * (r - 1), m_dy * r + focus.y() * (r - 1));
 }
 
-void ImageWidget::bestFit()
+void ImageWidgetGL::bestFit()
 {
     m_bestFit = true;
     m_scale = std::min((float)m_width/m_imgWidth, (float)m_height/m_imgHeight);
     setOffset(0, 0);
 }
 
-void ImageWidget::allocateThumbnails(const QStringList &paths)
+void ImageWidgetGL::allocateThumbnails(const QStringList &paths)
 {
     makeCurrent();
     int count = paths.size();
@@ -234,7 +228,7 @@ void ImageWidget::allocateThumbnails(const QStringList &paths)
     m_thumbnailTexture->allocateStorage();
 }
 
-QVector2D ImageWidget::getImagePixelCoord(const QVector2D &pos)
+QVector2D ImageWidgetGL::getImagePixelCoord(const QVector2D &pos)
 {
     float dx = m_dx;
     float dy = m_dy;
@@ -247,7 +241,7 @@ QVector2D ImageWidget::getImagePixelCoord(const QVector2D &pos)
     return (pos + offset) / m_scale;
 }
 
-void ImageWidget::setBayerMask(int mask)
+void ImageWidgetGL::setBayerMask(int mask)
 {
     m_firstRed[0] = mask & 0x1;
     m_firstRed[1] = (mask & 0x2) >> 1;
@@ -259,13 +253,13 @@ void ImageWidget::setBayerMask(int mask)
     update();
 }
 
-void ImageWidget::setMTFParams(const MTFParam &params)
+void ImageWidgetGL::setMTFParams(const MTFParam &params)
 {
     m_mtfParams = params;
     update();
 }
 
-void ImageWidget::setOffset(float dx, float dy)
+void ImageWidgetGL::setOffset(float dx, float dy)
 {
     m_dx = std::clamp(dx, 0.0f, std::max(0.0f, m_imgWidth * m_scale - m_width));
     if(m_showThumbnails)
@@ -276,25 +270,25 @@ void ImageWidget::setOffset(float dx, float dy)
     update();
 }
 
-void ImageWidget::superPixel(bool enable)
+void ImageWidgetGL::superPixel(bool enable)
 {
     m_superpixel = enable;
     update();
 }
 
-void ImageWidget::invert(bool enable)
+void ImageWidgetGL::invert(bool enable)
 {
     m_invert = enable;
     update();
 }
 
-void ImageWidget::falseColor(bool enable)
+void ImageWidgetGL::falseColor(bool enable)
 {
     m_falseColor = enable;
     update();
 }
 
-QImage ImageWidget::renderToImage()
+QImage ImageWidgetGL::renderToImage()
 {
     if(m_imgWidth < 0)return QImage();
     makeCurrent();
@@ -302,6 +296,7 @@ QImage ImageWidget::renderToImage()
     fbo.bind();
 
     f->glViewport(0, 0, m_imgWidth, m_imgHeight);
+    m_vao->bind();
 
     m_program->bind();
     m_program->setUniformValue("viewport", (float)m_imgWidth, (float)m_imgHeight);
@@ -309,16 +304,20 @@ QImage ImageWidget::renderToImage()
     m_program->setUniformValue("zoom", 1.0f);
 
     if(m_superpixel && m_debayerTex)
+    {
+        f->glActiveTexture(GL_TEXTURE0);
         f->glBindTexture(GL_TEXTURE_2D, m_debayerTex);
+    }
     else
         m_image->bind(0);
     f->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+    m_vao->release();
 
     fbo.bindDefault();
     return fbo.toImage(true);
 }
 
-void ImageWidget::thumbnailLoaded(const Image *image)
+void ImageWidgetGL::thumbnailLoaded(const Image *image)
 {
     if(image->number() >= m_maxArrayLayers)
         return;
@@ -336,13 +335,13 @@ void ImageWidget::thumbnailLoaded(const Image *image)
     if(!m_updateTimer->isActive())m_updateTimer->start();
 }
 
-void ImageWidget::showThumbnail(bool enable)
+void ImageWidgetGL::showThumbnail(bool enable)
 {
     m_showThumbnails = enable;
     setOffset(m_dx, m_dy);
 }
 
-void ImageWidget::paintGL()
+void ImageWidgetGL::paintGL()
 {
     float dx = m_dx;
     float dy = m_dy;
@@ -455,7 +454,7 @@ void ImageWidget::paintGL()
 
 }
 
-void ImageWidget::resizeGL(int w, int h)
+void ImageWidgetGL::resizeGL(int w, int h)
 {
     m_width = w;
     m_height = h;
@@ -464,7 +463,7 @@ void ImageWidget::resizeGL(int w, int h)
     updateScrollBars();
 }
 
-void ImageWidget::initializeGL()
+void ImageWidgetGL::initializeGL()
 {
     f = context()->functions();
     fx = context()->extraFunctions();
@@ -483,11 +482,11 @@ void ImageWidget::initializeGL()
         if(OpenGLES)
         {
             src = "#version 300 es\n"
-                "precision highp float;\n"
-                "precision highp sampler2D;\n"
-                "precision highp sampler2DArray;\n"
-                "precision highp sampler3D;\n"
-                "#line 1\n";
+                  "precision highp float;\n"
+                  "precision highp sampler2D;\n"
+                  "precision highp sampler2DArray;\n"
+                  "precision highp sampler3D;\n"
+                  "#line 1\n";
         }
         else
         {
@@ -507,9 +506,9 @@ void ImageWidget::initializeGL()
     logger->initialize();
     logger->startLogging();
     connect(logger, &QOpenGLDebugLogger::messageLogged, [](const QOpenGLDebugMessage &message)
-        {
-            qDebug() << message;
-        });
+            {
+                qDebug() << message;
+            });
 
     qDebug() << "Vendor:"   << (char*)f->glGetString(GL_VENDOR);
     qDebug() << "Renderer:" << (char*)f->glGetString(GL_RENDERER);
@@ -524,9 +523,9 @@ void ImageWidget::initializeGL()
 
     // each vertex is  x,y 2D position and s,t texture coordinates
     float vertexs[] = {-1.0f, -1.0f, 0.0f, 1.0f,
-                        1.0f, -1.0f, 1.0f, 1.0f,
-                       -1.0f,  1.0f, 0.0f, 0.0f,
-                        1.0f,  1.0f, 1.0f, 0.0f,};
+        1.0f, -1.0f, 1.0f, 1.0f,
+        -1.0f,  1.0f, 0.0f, 0.0f,
+        1.0f,  1.0f, 1.0f, 0.0f,};
     m_buffer = std::unique_ptr<QOpenGLBuffer>(new QOpenGLBuffer(QOpenGLBuffer::VertexBuffer));
     m_buffer->setUsagePattern(QOpenGLBuffer::StaticDraw);
     m_buffer->create();
@@ -616,13 +615,13 @@ void ImageWidget::initializeGL()
         setImage(m_rawImage, m_currentImg);
 }
 
-void ImageWidget::dragEnterEvent(QDragEnterEvent *event)
+void ImageWidgetGL::dragEnterEvent(QDragEnterEvent *event)
 {
     if(event->mimeData()->hasUrls() && event->proposedAction() & (Qt::CopyAction | Qt::MoveAction))
         event->acceptProposedAction();
 }
 
-void ImageWidget::dropEvent(QDropEvent *event)
+void ImageWidgetGL::dropEvent(QDropEvent *event)
 {
     if(event->mimeData()->hasUrls() && event->proposedAction() & (Qt::CopyAction | Qt::MoveAction))
     {
@@ -639,7 +638,7 @@ void ImageWidget::dropEvent(QDropEvent *event)
     event->ignore();
 }
 
-void ImageWidget::mousePressEvent(QMouseEvent *event)
+void ImageWidgetGL::mousePressEvent(QMouseEvent *event)
 {
     if(m_showThumbnails && event->button() == Qt::LeftButton && event->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier))
         m_selecting = true;
@@ -655,7 +654,7 @@ void ImageWidget::mousePressEvent(QMouseEvent *event)
     }
 }
 
-void ImageWidget::mouseMoveEvent(QMouseEvent *event)
+void ImageWidgetGL::mouseMoveEvent(QMouseEvent *event)
 {
     if(m_selecting)
     {
@@ -690,7 +689,7 @@ void ImageWidget::mouseMoveEvent(QMouseEvent *event)
     }
 }
 
-void ImageWidget::mouseReleaseEvent(QMouseEvent *event)
+void ImageWidgetGL::mouseReleaseEvent(QMouseEvent *event)
 {
     if(m_selecting)
     {
@@ -721,7 +720,7 @@ void ImageWidget::mouseReleaseEvent(QMouseEvent *event)
     }
 }
 
-void ImageWidget::wheelEvent(QWheelEvent *event)
+void ImageWidgetGL::wheelEvent(QWheelEvent *event)
 {
     if(m_showThumbnails)
     {
@@ -734,7 +733,7 @@ void ImageWidget::wheelEvent(QWheelEvent *event)
     }
 }
 
-void ImageWidget::thumbSelect(QMouseEvent *event)
+void ImageWidgetGL::thumbSelect(QMouseEvent *event)
 {
     QPoint p = event->pos();
     const int off = (THUMB_SIZE_BORDER - THUMB_SIZE) / 2;
@@ -763,7 +762,7 @@ void ImageWidget::thumbSelect(QMouseEvent *event)
     }
 }
 
-void ImageWidget::debayer()
+void ImageWidgetGL::debayer()
 {
     if(m_debayerTex > 0 || !m_superpixel || !m_bwImg || m_imgWidth < 0)return;
 
@@ -786,99 +785,10 @@ void ImageWidget::debayer()
     f->glGenerateMipmap(GL_TEXTURE_2D);
 }
 
-void ImageWidget::updateScrollBars()
+void ImageWidgetGL::updateScrollBars()
 {
     if(m_showThumbnails)
         emit scrollBarsUpdate(0, 0, -1, m_dy, m_height, (m_thumbnailCount / (m_width / THUMB_SIZE_BORDER) + 2) * THUMB_SIZE_BORDER_Y - m_height);
     else
         emit scrollBarsUpdate(m_dx, m_width, m_imgWidth * m_scale - m_width, m_dy, m_height, m_imgHeight * m_scale - m_height);
 }
-
-ImageScrollAreaGL::ImageScrollAreaGL(Database *database, QWidget *parent) : QWidget(parent)
-{
-    QGridLayout *layout = new QGridLayout(this);
-    setLayout(layout);
-
-    m_imageWidget = new ImageWidget(database, this);
-
-    m_verticalScrollBar = new QScrollBar(Qt::Vertical, this);
-    m_horizontalScrollBar = new QScrollBar(Qt::Horizontal, this);
-
-    layout->setSpacing(0);
-    layout->addWidget(m_imageWidget, 0, 0);
-    layout->addWidget(m_verticalScrollBar, 0, 1);
-    layout->addWidget(m_horizontalScrollBar, 1, 0);
-
-    connect(m_verticalScrollBar, SIGNAL(valueChanged(int)), this, SLOT(scrollEvent()));
-    connect(m_horizontalScrollBar, SIGNAL(valueChanged(int)), this, SLOT(scrollEvent()));
-    connect(m_imageWidget, &ImageWidget::scrollBarsUpdate, this, &ImageScrollAreaGL::updateScrollbars);
-}
-
-ImageScrollAreaGL::~ImageScrollAreaGL()
-{
-
-}
-
-void ImageScrollAreaGL::setImage(Image *image)
-{
-    if(image && image->rawImage())
-    {
-        m_imageWidget->setImage(image->rawImage(), image->number());
-        m_imageWidget->setWCS(image->info().wcs);
-    }
-}
-
-ImageWidget *ImageScrollAreaGL::imageWidget()
-{
-    return m_imageWidget;
-}
-
-void ImageScrollAreaGL::updateScrollbars(int valueH, int stepH, int maxH, int valueV, int stepV, int maxV)
-{
-    if(maxH > 0)
-    {
-        m_horizontalScrollBar->show();
-        m_horizontalScrollBar->setRange(0, maxH);
-        m_horizontalScrollBar->setPageStep(stepH);
-        m_horizontalScrollBar->setValue(valueH);
-    }
-    else
-        m_horizontalScrollBar->hide();
-
-    if(maxV > 0)
-    {
-        m_verticalScrollBar->show();
-        m_verticalScrollBar->setRange(0, maxV);
-        m_verticalScrollBar->setPageStep(stepV);
-        m_verticalScrollBar->setValue(valueV);
-    }
-    else
-        m_verticalScrollBar->hide();
-}
-
-void ImageScrollAreaGL::zoomIn()
-{
-    m_imageWidget->zoom(1);
-}
-
-void ImageScrollAreaGL::zoomOut()
-{
-    m_imageWidget->zoom(-1);
-}
-
-void ImageScrollAreaGL::bestFit()
-{
-    m_horizontalScrollBar->hide();
-    m_verticalScrollBar->hide();
-    m_imageWidget->bestFit();
-}
-
-void ImageScrollAreaGL::oneToOne()
-{
-    m_imageWidget->zoom(0);
-}
-
-void ImageScrollAreaGL::scrollEvent()
-{
-    m_imageWidget->setOffset(m_horizontalScrollBar->value(), m_verticalScrollBar->value());
-}
diff --git a/imagescrollareagl.h b/imagewidget.h
similarity index 60%
rename from imagescrollareagl.h
rename to imagewidget.h
index a0c1fec..fbda655 100644
--- a/imagescrollareagl.h
+++ b/imagewidget.h
@@ -1,21 +1,42 @@
-#ifndef IMAGESCROLLAREAGL_H
-#define IMAGESCROLLAREAGL_H
+#ifndef IMAGEWIDGET_H
+#define IMAGEWIDGET_H
 
 #include <memory>
-#include <QObject>
 #include <QOpenGLWidget>
 #include <QOpenGLShaderProgram>
 #include <QOpenGLBuffer>
 #include <QOpenGLTexture>
 #include <QOpenGLVertexArrayObject>
-#include <QScrollBar>
-#include <QTimer>
-#include "rawimage.h"
-#include "imageringlist.h"
-#include "database.h"
-#include "stretchtoolbar.h"
 #include <QOpenGLFunctions>
-#include <QOpenGLExtraFunctions>
+#include "database.h"
+#include "rawimage.h"
+#include "imageinfo.h"
+#include "stretchtoolbar.h"
+
+class ImageWidget
+{
+public:
+    ImageWidget(){}
+    virtual ~ImageWidget(){}
+
+    virtual void setImage(std::shared_ptr<RawImage> image, int index) = 0;
+    virtual void setWCS(std::shared_ptr<WCSData> wcs) = 0;
+
+    virtual void zoom(int zoom, const QPointF &mousePos = QPointF()) = 0;
+    virtual void bestFit() = 0;
+
+    virtual void setBayerMask(int mask) = 0;
+    virtual void setOffset(float dx, float dy) = 0;
+    virtual void allocateThumbnails(const QStringList &paths) = 0;
+
+    virtual void setMTFParams(const MTFParam &params) = 0;
+    virtual void superPixel(bool enable) = 0;
+    virtual void invert(bool enable) = 0;
+    virtual void falseColor(bool enable) = 0;
+    virtual QImage renderToImage() = 0;
+    virtual void thumbnailLoaded(const Image *image) = 0;
+    virtual void showThumbnail(bool enable) = 0;
+};
 
 struct ImageThumb
 {
@@ -26,7 +47,7 @@ struct ImageThumb
     bool dirty;
 };
 
-class ImageWidget : public QOpenGLWidget
+class ImageWidgetGL : public QOpenGLWidget, public ImageWidget
 {
     Q_OBJECT
     QOpenGLFunctions *f = nullptr;
@@ -71,25 +92,23 @@ class ImageWidget : public QOpenGLWidget
     QPointF m_lastPos;
     QString m_error;
 public:
-    explicit ImageWidget(Database *database, QWidget *parent = nullptr);
-    ~ImageWidget() override;
-    void setImage(std::shared_ptr<RawImage> image, int index);
-    void setImage(const QPixmap &pixmap);
-    void setWCS(std::shared_ptr<WCSData> wcs);
-    void zoom(int zoom, const QPointF &mousePos = QPointF());
-    void bestFit();
-    void allocateThumbnails(const QStringList &paths);
+    explicit ImageWidgetGL(Database *database, QWidget *parent = nullptr);
+    ~ImageWidgetGL() override;
+    void setImage(std::shared_ptr<RawImage> image, int index) override;
+    void setWCS(std::shared_ptr<WCSData> wcs) override;
+    void zoom(int zoom, const QPointF &mousePos = QPointF()) override;
+    void bestFit() override;
+    void allocateThumbnails(const QStringList &paths) override;
     QVector2D getImagePixelCoord(const QVector2D &pos);
-    void setBayerMask(int mask);
-public slots:
-    void setMTFParams(const MTFParam &params);
-    void setOffset(float dx, float dy);
-    void superPixel(bool enable);
-    void invert(bool enable);
-    void falseColor(bool enable);
-    QImage renderToImage();
-    void thumbnailLoaded(const Image *image);
-    void showThumbnail(bool enable);
+    void setBayerMask(int mask) override;
+    void setOffset(float dx, float dy) override;
+    void setMTFParams(const MTFParam &params) override;
+    void superPixel(bool enable) override;
+    void invert(bool enable) override;
+    void falseColor(bool enable) override;
+    QImage renderToImage() override;
+    void thumbnailLoaded(const Image *image) override;
+    void showThumbnail(bool enable) override;
 protected:
     void paintGL() override;
     void resizeGL(int w, int h) override;
@@ -109,26 +128,4 @@ signals:
     void scrollBarsUpdate(int valueH, int stepH, int maxH, int valueV, int stepV, int maxV);
 };
 
-class ImageScrollAreaGL : public QWidget
-{
-    Q_OBJECT
-    QScrollBar *m_verticalScrollBar;
-    QScrollBar *m_horizontalScrollBar;
-    ImageWidget *m_imageWidget;
-public:
-    explicit ImageScrollAreaGL(Database *database, QWidget *parent = nullptr);
-    ~ImageScrollAreaGL() override;
-    void setImage(Image *image);
-    ImageWidget* imageWidget();
-protected:
-    void updateScrollbars(int valueH, int stepH, int maxH, int valueV, int stepV, int maxV);
-public slots:
-    void zoomIn();
-    void zoomOut();
-    void bestFit();
-    void oneToOne();
-protected slots:
-    void scrollEvent();
-};
-
-#endif // IMAGESCROLLAREAGL_H
+#endif // IMAGEWIDGET_H
diff --git a/mainwindow.cpp b/mainwindow.cpp
index de67fd5..7d39bf3 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -76,19 +76,19 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
     if(!m_database->init())
         QMessageBox::critical(this, tr("Can't open DB"), tr("Can't open SQLITE database"));
 
-    m_imageGL = new ImageScrollAreaGL(m_database, this);
-    setCentralWidget(m_imageGL);
+    m_image = new ImageScrollArea(m_database, this);
+    setCentralWidget(m_image);
 
     StatusBar *statusBar = new StatusBar(this);
     setStatusBar(statusBar);
-    connect(m_imageGL->imageWidget(), &ImageWidget::status, statusBar, &StatusBar::newStatus);
+    connect(m_image, &ImageScrollArea::status, statusBar, &StatusBar::newStatus);
 
     m_stretchPanel = new StretchToolbar(this);
-    connect(m_stretchPanel, &StretchToolbar::paramChanged, m_imageGL->imageWidget(), &ImageWidget::setMTFParams);
+    connect(m_stretchPanel, &StretchToolbar::paramChanged, m_image, &ImageScrollArea::setMTFParams);
     connect(m_stretchPanel, &StretchToolbar::autoStretch, [&](){ m_stretchPanel->stretchImage(m_ringList->currentImage().get()); });
-    connect(m_stretchPanel, &StretchToolbar::invert, m_imageGL->imageWidget(), &ImageWidget::invert);
-    connect(m_stretchPanel, &StretchToolbar::superPixel, m_imageGL->imageWidget(), &ImageWidget::superPixel);
-    connect(m_stretchPanel, &StretchToolbar::falseColor, m_imageGL->imageWidget(), &ImageWidget::falseColor);
+    connect(m_stretchPanel, &StretchToolbar::invert, m_image, &ImageScrollArea::invert);
+    connect(m_stretchPanel, &StretchToolbar::superPixel, m_image, &ImageScrollArea::superPixel);
+    connect(m_stretchPanel, &StretchToolbar::falseColor, m_image, &ImageScrollArea::falseColor);
 
     m_ringList = new ImageRingList(m_database, nameFilter, this);
     m_filesystem = new FilesystemWidget(m_ringList, this);
@@ -133,14 +133,14 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
 
     setWindowTitle(tr("Tenmon"));
 
-    connect(m_ringList, SIGNAL(pixmapLoaded(Image*)), this, SLOT(pixmapLoaded(Image*)));
-    connect(m_ringList, SIGNAL(currentImageChanged(int)), this, SLOT(updateWindowTitle()));
-    connect(m_ringList, SIGNAL(infoLoaded(ImageInfoData)), m_info, SLOT(setInfo(const ImageInfoData&)));
-    connect(m_ringList, SIGNAL(currentImageChanged(int)), m_filesystem, SLOT(selectFile(int)));
-    connect(m_ringList, &ImageRingList::thumbnailLoaded, m_imageGL->imageWidget(), &ImageWidget::thumbnailLoaded);
+    connect(m_ringList, &ImageRingList::pixmapLoaded, m_image, &ImageScrollArea::imageLoaded);
+    connect(m_ringList, &ImageRingList::currentImageChanged, this, &MainWindow::updateWindowTitle);
+    connect(m_ringList, &ImageRingList::infoLoaded, m_info, &ImageInfo::setInfo);
+    connect(m_ringList, &ImageRingList::currentImageChanged, m_filesystem, &FilesystemWidget::selectFile);
+    connect(m_ringList, &ImageRingList::thumbnailLoaded, m_image, &ImageScrollArea::thumbnailLoaded);
     connect(m_ringList, &ImageRingList::pixmapLoaded, m_stretchPanel, &StretchToolbar::imageLoaded);
     connect(m_ringList, &ImageRingList::pixmapLoaded, histogram, &Histogram::imageLoaded);
-    connect(m_imageGL->imageWidget(), &ImageWidget::fileDropped, this, static_cast<void (MainWindow::*)(const QString &)>(&MainWindow::loadFile));
+    connect(m_image, &ImageScrollArea::fileDropped, this, static_cast<void (MainWindow::*)(const QString &)>(&MainWindow::loadFile));
 
     QMenu *fileMenu = new QMenu(tr("File"), this);
     fileMenu->addAction(tr("Open"), QKeySequence::Open, this, SLOT(loadFile()));
@@ -171,10 +171,10 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
     menuBar()->addMenu(editMenu);
 
     QMenu *viewMenu = new QMenu(tr("View"), this);
-    viewMenu->addAction(tr("Zoom In"), QKeySequence::ZoomIn, m_imageGL, SLOT(zoomIn()));
-    viewMenu->addAction(tr("Zoom Out"), QKeySequence::ZoomOut, m_imageGL, SLOT(zoomOut()));
-    viewMenu->addAction(tr("Best Fit"), QKeySequence("Ctrl+1"), m_imageGL, SLOT(bestFit()));
-    viewMenu->addAction(tr("100%"), m_imageGL, SLOT(oneToOne()));
+    viewMenu->addAction(tr("Zoom In"), QKeySequence::ZoomIn, m_image, &ImageScrollArea::zoomIn);
+    viewMenu->addAction(tr("Zoom Out"), QKeySequence::ZoomOut, m_image, &ImageScrollArea::zoomOut);
+    viewMenu->addAction(tr("Best Fit"), QKeySequence("Ctrl+1"), m_image, &ImageScrollArea::bestFit);
+    viewMenu->addAction(tr("100%"), m_image, &ImageScrollArea::oneToOne);
     viewMenu->addSeparator();
     QMenu *bayerMenu = viewMenu->addMenu(tr("Bayer mask"));
     QActionGroup *bayerActionGroup = new QActionGroup(this);
@@ -190,15 +190,15 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
     viewMenu->addMenu(bayerMenu);
     connect(bayerActionGroup, &QActionGroup::triggered, [this](QAction *action){
         int data = action->data().toInt();
-        m_imageGL->imageWidget()->setBayerMask(data);
+        m_image->setBayerMask(data);
         QSettings settings;
         settings.setValue("mainwindow/bayermask", data);
     });
 
     QAction *thumbnailsAction = viewMenu->addAction(tr("Thumbnails"), Qt::Key_F2, [this](bool checked){
         if(SettingsDialog::loadThumbsizes())m_ringList->clearThumbnails();
-        m_imageGL->imageWidget()->allocateThumbnails(m_ringList->imageNames());
-        m_imageGL->imageWidget()->showThumbnail(checked);
+        m_image->allocateThumbnails(m_ringList->imageNames());
+        m_image->showThumbnail(checked);
         if(checked)m_ringList->loadThumbnails();
         else m_ringList->stopLoading();
     });
@@ -295,7 +295,7 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
         }
     }
 
-    m_imageGL->setFocus();
+    m_image->setFocus();
 
     // workaround for nasty wayland backend bug https://bugreports.qt.io/browse/QTBUG-87332
     if(static_cast<QGuiApplication*>(QCoreApplication::instance())->platformName() == "wayland")
@@ -451,14 +451,6 @@ void MainWindow::socketNotify()
     socketNotifier->setEnabled(true);
 }
 
-void MainWindow::pixmapLoaded(Image *image)
-{
-    if(image->rawImage())
-    {
-        m_imageGL->setImage(image);
-    }
-}
-
 void MainWindow::loadFile()
 {
     QString file = QFileDialog::getOpenFileName(this,
@@ -557,7 +549,7 @@ void MainWindow::saveAs()
         }
         else
         {
-            QImage img = m_imageGL->imageWidget()->renderToImage();
+            QImage img = m_image->renderToImage();
             if(!img.isNull())
                 img.save(file, filterToFormat(file, selectedFilter));
         }
diff --git a/mainwindow.h b/mainwindow.h
index b140eed..81765bd 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -4,10 +4,9 @@
 #include <QMainWindow>
 #include <QSocketNotifier>
 #include "imageringlist.h"
-#include "imagescrollarea.h"
 #include "database.h"
 #include "imageinfo.h"
-#include "imagescrollareagl.h"
+#include "imagescrollarea.h"
 #include "filesystemwidget.h"
 #include "stretchtoolbar.h"
 #include "databaseview.h"
@@ -16,7 +15,6 @@ class MainWindow : public QMainWindow
 {
     Q_OBJECT
     ImageScrollArea *m_image;
-    ImageScrollAreaGL *m_imageGL;
     ImageRingList *m_ringList;
     StretchToolbar *m_stretchPanel;
     Database *m_database;
@@ -44,7 +42,6 @@ protected:
 protected slots:
     void socketNotify();
     void updateWindowTitle();
-    void pixmapLoaded(Image *image);
     void loadFile();
     void loadFile(const QString &path);
     void loadFile(int row);