diff --git a/clahe.cpp b/clahe.cpp
index 76c95cc..f56c8ff 100644
--- a/clahe.cpp
+++ b/clahe.cpp
@@ -13,16 +13,16 @@ void CLAHE::loadFile(const QString &path)
     int type = tmp.depth();
     _scale = type==CV_8U ? 1.0/255 : 1.0/65535;
     tmp.convertTo(tmp, CV_32F, _scale);
-    cv::cvtColor(tmp, tmp, cv::COLOR_BGR2Lab);
+    cv::cvtColor(tmp, tmp, cv::COLOR_BGR2YCrCb);
     cv::split(tmp, _image);
-    _image[0].convertTo(_lumImage, type, 0.01/_scale);
+    _image[0].convertTo(_lumImage, type, 1/_scale);
 }
 
 void CLAHE::saveFile(const QString &path)
 {
     cv::Mat tmp;
     cv::merge(_image, 3, tmp);
-    cv::cvtColor(tmp, tmp, cv::COLOR_Lab2BGR);
+    cv::cvtColor(tmp, tmp, cv::COLOR_YCrCb2BGR);
     tmp.convertTo(tmp, _lumImage.depth(), 1/_scale);
     cv::imwrite(path.toLocal8Bit().data(), tmp);
 }
@@ -32,7 +32,7 @@ void CLAHE::apply(float clipLimit, int kernelSize)
     cv::Mat lum;
     cv::Ptr<cv::CLAHE> clahe = cv::createCLAHE(clipLimit, cv::Size(kernelSize, kernelSize));
     clahe->apply(_lumImage, lum);
-    lum.convertTo(_image[0], CV_32F, 100*_scale);
+    lum.convertTo(_image[0], CV_32F, _scale);
     double min, max;
     cv::minMaxLoc(_image[0], &min, &max);
     qDebug() << min << max;
@@ -42,7 +42,7 @@ QPixmap CLAHE::getImage() const
 {
     cv::Mat tmp;
     cv::merge(_image, 3, tmp);
-    cv::cvtColor(tmp, tmp, cv::COLOR_Lab2RGB);
+    cv::cvtColor(tmp, tmp, cv::COLOR_YCrCb2RGB);
     tmp.convertTo(tmp, CV_8U, 255);
     QImage ret(tmp.data, tmp.cols, tmp.rows, tmp.step1(), QImage::Format_RGB888);
     //ret.bits();//perform deep copy of tmp.data pointer