Brightening an image

The convertTo method provides a means of brightening an image. The original image is copied to a new image where the contrast and brightness is adjusted. The first parameter is the destination image. The second specifies that the type of image should not be changed. The third and fourth parameters control the contrast and brightness respectively. The first value is multiplied by this value while the second is added to the multiplied value:

Mat source = Imgcodecs.imread("cat.jpg"); 
Mat destination = new Mat(source.rows(), source.cols(), 
        source.type()); 
source.convertTo(destination, -1, 1, 50); 
Imgcodecs.imwrite("brighterCat.jpg", destination); 

The enhanced image follows: