I am using the following code to create a magnifying glass of sorts:
glRasterPos2i(0, 0); glBitmap(0, 0, 0, 0, mClickX - 500, mClickY, null); glPixelZoom(2.0f, 2.0f); glCopyPixels(mClickX - 250, mClickY, 250, 250, GL_COLOR);
However, The colors of the resulting display do not match the original. It seems as though my colors are being clamped to a very small range.
I guess I should add that the “original” is an image being drawn with glDrawPixels using GL_LUMINANCE. I am also applying a pixel map so some clamping is expected, but not even close to what the result is.
I thought maybe my problem was because I am reading from the back buffer so I added a glReadBuffer(GL_FRONT). This had an even worse effect. Not only were the colors off, the image seemed a little distorted.