I am currently using OpenGL as a realtime solution for removing barrel distortion from images. I have written code which creates a 3-d shape and place my image on it as a texture. The shape is pretty much a 2-d square with the center sunken in and the four side pinched in. This corrects the barrel distortion, but now I need to some how save the way the image looks on screen. I figure the only way I could do this would be to take a screen shot of the screen, and save it as a bitmap. I ideally want to get 32 frames per second, so this is going to be too slow. If anyone one can see a better way to do this, please let me know.