upload correction task

src/core/transformations/correction.cpp

@@ -21,7 +21,30 @@ PNM* Correction::transform()
 
     PNM* newImage = new PNM(width, height, image->format());
 
-    qDebug() << Q_FUNC_INFO << "Not implemented yet!";
+    for (int i=0; i<256; ++i) {
+
+        int newColor = pow(i, gamma);
+        newColor = newColor * factor;
+        newColor = newColor + shift;
+
+        if (newColor > 255) newColor = 255;
+        else if (newColor < 0) newColor = 0;
+
+        LUT[i] = newColor;
+    }
+
+    for (int x=0; x<width; x++)
+        for (int y=0; y<height; y++)
+        {
+            QRgb pixel = image->pixel(x,y);
+
+            int red = LUT[qRed(pixel)];
+            int green = LUT[qGreen(pixel)];
+            int blue = LUT[qBlue(pixel)];
+
+            newImage->setPixel(x,y, QColor(red,green,blue).rgb());
+        }
 
     return newImage;
 }
+