brightness/contrast/gamma

src/core/transformations/correction.cpp

@@ -21,7 +21,34 @@ PNM* Correction::transform()
 
     PNM* newImage = new PNM(width, height, image->format());
 
-    qDebug() << Q_FUNC_INFO << "Not implemented yet!";
+    for (int y = 0; y < height; ++y)
+    {
+        for (int x = 0; x < width; ++x)
+        {
+            QRgb pixel = image->pixel(x, y);
+            int red = qRed(pixel);
+            int green = qGreen(pixel);
+            int blue = qBlue(pixel);
+
+            red += shift;
+            green += shift;
+            blue += shift;
+
+            red *= factor;
+            green *= factor;
+            blue *= factor;
+
+            red = pow(red / 255.0, gamma) * 255;
+            green = pow(green / 255.0, gamma) * 255;
+            blue = pow(blue / 255.0, gamma) * 255;
+
+            red = qBound(0, red, 255);
+            green = qBound(0, green, 255);
+            blue = qBound(0, blue, 255);
+
+            newImage->setPixel(x, y, qRgb(red, green, blue));
+        }
+    }
 
     return newImage;
 }