gluScaleImage() Query....

//nImageComps = number of image components, ie 3 (R,G and B)

pPreImage = (unsigned char *)malloc(nPreWidth * nPreHeight * nImageComps);

//read in image to pPreImage

//calculate new size for image

pPostImage = (unsigned char *)malloc(nPostWidth * nPostHeight * nImageComps);

gluScaleImage(GL_BGRA_EXT,						nPreWidth, nPreHeight,						GL_UNSIGNED_BYTE, pPreImage,					nPostWidth, nPostHeight,					GL_UNSIGNED_BYTE, pPostImage);