public final void applyColourMask(int maskID) {
		for (int h = myHeight - 1; h > 0; h--) {
			int x = h * myWidth;
			for (int w = myWidth - 1; w > 0; w--) {
				if (myPixels[w + x] == 0 && myPixels[w + x - 1 - myWidth] != 0) {
					myPixels[w + x] = maskID;
				}
			}
		}
	}