diff --git a/batchprocessing.cpp b/batchprocessing.cpp
index a682aec..5dfbecc 100644
--- a/batchprocessing.cpp
+++ b/batchprocessing.cpp
@@ -17,12 +17,12 @@
 #include <QMessageBox>
 #endif
 
-QStringList scanDirectories(const QStringList &paths)
+QList<QPair<QString, QString>> scanDirectories(const QStringList &paths)
 {
-    QStringList files;
+    QList<QPair<QString, QString>> files;
     QStringList scannedDirs;
 
-    std::function<void(const QString &path)> scanDirectory = [&](const QString &path)
+    std::function<void(const QString &root, const QString &path)> scanDirectory = [&](const QString &root, const QString &path)
     {
         QFileInfo info(path);
         if(info.isDir() && !scannedDirs.contains(info.canonicalFilePath()))
@@ -31,16 +31,16 @@ QStringList scanDirectories(const QStringList &paths)
             QDir dir(path);
             QStringList entries = dir.entryList(QDir::Dirs | QDir::Files | QDir::NoDotAndDotDot);
             for(QString &entry : entries)
-                scanDirectory(dir.absoluteFilePath(entry));
+                scanDirectory(root, dir.absoluteFilePath(entry));
         }
         else if(info.isFile())
         {
-            files.append(path);
+            files.append({path, root});
         }
     };
 
     for(const QString &path : paths)
-        scanDirectory(path);
+        scanDirectory(path, path);
 
     return files;
 }
diff --git a/scriptengine.cpp b/scriptengine.cpp
index 3cdba65..dc32057 100644
--- a/scriptengine.cpp
+++ b/scriptengine.cpp
@@ -20,7 +20,7 @@ ScriptEngine::ScriptEngine(QObject *parent) : QObject(parent)
     _semaphore.release(_pool->maxThreadCount());
 }
 
-void ScriptEngine::setParams(const QString &scriptPath, const QStringList &paths, const QString &outputDir)
+void ScriptEngine::setParams(const QString &scriptPath, const QList<QPair<QString, QString>> &paths, const QString &outputDir)
 {
     _scriptPath = scriptPath;
     _paths = paths;
@@ -67,7 +67,23 @@ bool ScriptEngine::isMarked(const File *file) const
     return _database->isMarked(file->absoluteFilePath());
 }
 
-bool ScriptEngine::convert(File *file, QString &outpath, QString format, QVariantMap params)
+void ScriptEngine::setMaxThread(int maxthread)
+{
+    int newval = std::max(std::min(QThread::idealThreadCount(), maxthread), 1);
+    int oldval = _pool->maxThreadCount();
+    if(newval > oldval)
+        _semaphore.release(newval - oldval);
+    else if(newval < oldval)
+        _semaphore.acquire(oldval - newval);
+    _pool->setMaxThreadCount(newval);
+}
+
+void ScriptEngine::sync()
+{
+    _pool->waitForDone();
+}
+
+bool ScriptEngine::convert(File *file, QString &outpath, const QString &format, const QVariantMap &params, bool async)
 {
     QString path;
     QDir dir(_outputDir);
@@ -79,9 +95,17 @@ bool ScriptEngine::convert(File *file, QString &outpath, QString format, QVarian
         path = dir.absoluteFilePath(outpath);
 
     info.setFile(path);
-    //qDebug() << info.absolutePath() + "/" + info.completeBaseName() + "." + format.toLower();
-    _semaphore.acquire();
-    _pool->start(new ConvertRunable(file->absoluteFilePath(), info.absolutePath() + "/" + info.completeBaseName() + "." + format.toLower(), format, params, &_semaphore));
+    outpath = info.absolutePath() + "/" + info.completeBaseName() + "." + format.toLower();
+    if(async)
+    {
+        _semaphore.acquire();
+        _pool->start(new ConvertRunable(file->absoluteFilePath(), outpath, format, params, &_semaphore));
+    }
+    else
+    {
+        ConvertRunable crun(file->absoluteFilePath(), outpath, format, params, nullptr);
+        crun.run();
+    }
     return true;
 }
 
@@ -90,11 +114,16 @@ QJSValue ScriptEngine::newObject()
     return _jsEngine->newObject();
 }
 
+QJSValue ScriptEngine::newArray(uint size)
+{
+    return _jsEngine->newArray(size);
+}
+
 void ScriptEngine::run()
 {
     QJSValue jsPaths = _jsEngine->newArray(_paths.size());
     for(qsizetype i=0; i<_paths.size(); i++)
-        jsPaths.setProperty(i, _jsEngine->newQObject(new File(_paths[i], this)));
+        jsPaths.setProperty(i, _jsEngine->newQObject(new File(_paths[i].first, _paths[i].second, this)));
 
     _jsEngine->globalObject().setProperty("files", jsPaths);
 
@@ -138,9 +167,10 @@ void File::loadFitsKeywords()
         }
         else return;
 
-        for(const FITSRecord &record : info.fitsHeader)
+        for(auto &record : info.fitsHeader)
         {
-            _fitsKeywords[record.key] = record.value.toString();
+            _fitsKeywords.append(record.key);
+            _fitsRecords.insert(record.key, record);
         }
     }
 }
@@ -165,9 +195,14 @@ bool File::mkpath(const QString &path) const
     }
 }
 
-File::File(const QString &path, Script::ScriptEngine *engine) :
+File::File(const QString &path, Script::ScriptEngine *engine) : File(path, QString(), engine)
+{
+}
+
+File::File(const QString &path, const QString &root, ScriptEngine *engine) :
     _engine(engine),
     _path(path),
+    _root(root),
     _info(path)
 {
 }
@@ -187,6 +222,18 @@ QString File::absolutePath() const
     return _info.absolutePath();
 }
 
+QString File::relativeFilePath() const
+{
+    QDir dir(_root);
+    return dir.relativeFilePath(_info.absoluteFilePath());
+}
+
+QString File::relativePath() const
+{
+    QDir dir(_root);
+    return dir.relativeFilePath(_info.absolutePath());
+}
+
 QString File::baseName() const
 {
     return _info.baseName();
@@ -209,53 +256,101 @@ qint64 File::size() const
 
 QStringList File::fitsKeywords()
 {
-    QThread::msleep(500);
     loadFitsKeywords();
-    return _fitsKeywords.keys();
+    return _fitsKeywords;
 }
 
 QString File::fitsValue(const QString &key)
 {
     loadFitsKeywords();
-    if(_fitsKeywords.contains(key))
-        return _fitsKeywords[key];
+    if(_fitsRecords.contains(key))
+        return _fitsRecords[key].value.toString();
     else
         return QString();
 }
 
+QJSValue File::fitsValues(const QString &key)
+{
+    loadFitsKeywords();
+    if(_fitsRecords.contains(key))
+    {
+        QList<FITSRecord> values =  _fitsRecords.values(key);
+        QJSValue array = _engine->newArray(values.size());
+        for(qsizetype i=0; i<values.size(); i++)
+            array.setProperty(i, values[i].value.toString());
+        return array;
+    }
+    else
+        return QString();
+}
+
+QJSValue File::fitsRecords()
+{
+    loadFitsKeywords();
+
+    QJSValue array = _engine->newArray(_fitsRecords.size());
+    uint i = 0;
+    for(auto &record : _fitsRecords)
+    {
+        QJSValue item = _engine->newObject();
+        item.setProperty("key", QString::fromUtf8(record.key));
+        item.setProperty("value", record.value.toString());
+        item.setProperty("comment", QString::fromUtf8(record.comment));
+        item.setProperty("xisf", record.xisf);
+        array.setProperty(i++, item);
+    }
+
+    return array;
+}
+
 bool File::isMarked() const
 {
     return _engine->isMarked(this);
 }
 
-bool File::copy(const QString &newpath) const
+File* File::copy(const QString &newpath) const
 {
     if(mkpath(newpath))
     {
         if(QFile::copy(_path, _engine->outputDir() + newpath))
-            return true;
+            return new File(_engine->outputDir() + newpath, _engine);
         _engine->logError("Failed copy to " + newpath);
-        return false;
+        return nullptr;
     }
-    return false;
+    return nullptr;
 }
 
-bool File::move(const QString &newpath) const
+bool File::move(const QString &newpath)
 {
     if(mkpath(newpath))
     {
         if(QFile::rename(_path, _engine->outputDir() + newpath))
+        {
+            _path = _engine->outputDir() + newpath;
             return true;
+        }
         _engine->logError("Failed move to " + newpath);
         return false;
     }
     return false;
 }
 
-bool File::convertTo(const QString &format)
+File* File::convert(const QString &outpath, const QString &format, const QVariantMap &params)
 {
-    _engine->reportError("Not implemented");
-    return false;
+    QString path = outpath;
+    if(_engine->convert(this, path, format, params, false))
+        return new File(path, _engine);
+    else
+        return nullptr;
+}
+
+File* File::convertAsync(const QString &outpath, const QString &format, const QVariantMap &params)
+{
+    QString path = outpath;
+    if(_engine->convert(this, path, format, params, true))
+        return new File(path, _engine);
+    else
+        return nullptr;
 }
 
 QJSValue File::stats()
@@ -298,7 +393,7 @@ ScriptEngineThread::~ScriptEngineThread()
     if(_engine)_engine->interrupt();
 }
 
-void ScriptEngineThread::setParams(const QString &scriptPath, const QStringList &paths, const QString &outputDir)
+void ScriptEngineThread::setParams(const QString &scriptPath, const QList<QPair<QString, QString>> &paths, const QString &outputDir)
 {
     _engine->setParams(scriptPath, paths, outputDir);
 }
diff --git a/scriptengine.h b/scriptengine.h
index 1aea2be..83abc4c 100644
--- a/scriptengine.h
+++ b/scriptengine.h
@@ -8,6 +8,7 @@
 #include <QThreadPool>
 #include <QSemaphore>
 #include "database.h"
+#include "imageinfo.h"
 
 namespace Script
 {
@@ -23,10 +24,10 @@ class ScriptEngine : public QObject
     QSemaphore _semaphore;
     QString _scriptPath;
     QString _outputDir;
-    QStringList _paths;
+    QList<QPair<QString, QString>> _paths;
 public:
     explicit ScriptEngine(QObject *parent = nullptr);
-    void setParams(const QString &scriptPath, const QStringList &paths, const QString &outputDir);
+    void setParams(const QString &scriptPath, const QList<QPair<QString, QString>> &paths, const QString &outputDir);
     void reportError(const QString &message);
     const QString& outputDir() const;
     void interrupt();
@@ -35,8 +36,11 @@ public:
     Q_INVOKABLE void mark(File *file);
     Q_INVOKABLE void unmark(File *file);
     Q_INVOKABLE bool isMarked(const File *file) const;
-    Q_INVOKABLE bool convert(File *file, QString &outpath, QString format, QVariantMap params);
+    Q_INVOKABLE void setMaxThread(int maxthread);
+    Q_INVOKABLE void sync();
+    bool convert(File *file, QString &outpath, const QString &format, const QVariantMap &params, bool async);
     QJSValue newObject();
+    QJSValue newArray(uint size);
 public slots:
     void run();
 signals:
@@ -52,7 +56,7 @@ class ScriptEngineThread : public QObject
 public:
     ScriptEngineThread(QObject *parent = nullptr);
     ~ScriptEngineThread();
-    void setParams(const QString &scriptPath, const QStringList &paths, const QString &outputDir);
+    void setParams(const QString &scriptPath, const QList<QPair<QString, QString>> &paths, const QString &outputDir);
     void start();
     void interrupt();
 signals:
@@ -65,27 +69,35 @@ class File : public QObject
     Q_OBJECT
     ScriptEngine *_engine;
     QString _path;
+    QString _root;
     QFileInfo _info;
     bool _fitsKeywordsLoaded = false;
-    QMap<QString, QString> _fitsKeywords;
+    QStringList _fitsKeywords;
+    QMultiHash<QString, FITSRecord> _fitsRecords;
     void loadFitsKeywords();
     bool mkpath(const QString &path) const;
     QJSValue _stats;
 public:
     explicit File(const QString &path, ScriptEngine *engine);
+    explicit File(const QString &path, const QString &root, ScriptEngine *engine);
     Q_INVOKABLE QString fileName() const;
     Q_INVOKABLE QString absoluteFilePath() const;
     Q_INVOKABLE QString absolutePath() const;
+    Q_INVOKABLE QString relativeFilePath() const;
+    Q_INVOKABLE QString relativePath() const;
     Q_INVOKABLE QString baseName() const;
     Q_INVOKABLE QString completeBaseName() const;
     Q_INVOKABLE QString suffix() const;
     Q_INVOKABLE qint64 size() const;
     Q_INVOKABLE QStringList fitsKeywords();
     Q_INVOKABLE QString fitsValue(const QString &key);
+    Q_INVOKABLE QJSValue fitsValues(const QString &key);
+    Q_INVOKABLE QJSValue fitsRecords();
     Q_INVOKABLE bool isMarked() const;
-    Q_INVOKABLE bool copy(const QString &newpath) const;
-    Q_INVOKABLE bool move(const QString &newpath) const;
-    Q_INVOKABLE bool convertTo(const QString &format);
+    Q_INVOKABLE File* copy(const QString &newpath) const;
+    Q_INVOKABLE bool move(const QString &newpath);
+    Q_INVOKABLE File* convert(const QString &outpath, const QString &format, const QVariantMap &params);
+    Q_INVOKABLE File* convertAsync(const QString &outpath, const QString &format, const QVariantMap &params);
     Q_INVOKABLE QJSValue stats();
 };