This must be called sequentially from n=0 to n=rows-1 One integer per sample , in the natural order: R G B R G B ... (or R G B A R G B A... if has alpha) The values should be between 0 and 255 for 8 bitspc images, and between 0- 65535 form 16 bitspc images (this applies also to the alpha channel if present) The array can be reused.