gistfile1.c

            uint8 *fourchan = (uint8*) malloc(sizeof(uint8) * width * height * 4);
            short cur;
            short *subscript = (short*) imgData;
            for (int i = 0; i < width * height; i++) {
                cur = subscript[i] + 1000;
                fourchan[i*4] = cur;
            }