gistfile1.cpp

void ImageProcessingClassApp::reduceIntensity(int n) 
{
  int reduce = 2 << n;
	// myImage is a object variable that starts as a grayscale copy of the original image
	Surface::Iter iter = myImage.getIter();
	while(iter.line()) {
		while(iter.pixel()) {
			int orig = iter.r();
			int next = orig/reduce;
			next *= reduce;
			iter.r() = next;
			iter.g() = next;
			iter.b() = next;
		}
	}
}

void ImageProcessingClassApp::average(int n)
{
	Surface::Iter iter = myImage.getIter(Area(0+n, 0+n, myImage.getWidth()-n, myImage.getHeight()-n));
	while(iter.line()) {
		while(iter.pixel()) {
			int sum = 0;
			int count = 0;
			for(int x = -n/2; x <= n/2; x++) {
				for(int y = -n/2; y <= n/2; y++) {
					count++;
					sum += iter.r(x,y);
				}
			}
			int average = sum/count;
			iter.r() = average;
			iter.g() = average;
			iter.b() = average;
		}
	}
}