+#define IMAGETYPE_BITMAP 0 /* monochrome bitmap */
+#define IMAGETYPE_RGB 1 /* RGB image with colormap */
+#define IMAGETYPE_TRUECOLOR 2 /* true-color image */
+
+#define TRUECOLOR_RED(pixel) (((unsigned long)((pixel) & 0xff0000)) >> 16)
+#define TRUECOLOR_GREEN(pixel) (((unsigned long)((pixel) & 0xff00)) >> 8)
+#define TRUECOLOR_BLUE(pixel) ( (unsigned long)((pixel) & 0xff))
+#define RGB_TO_TRUECOLOR(r,g,b) ((((unsigned long)((r) & 0xff00)) << 8) | ((g) & 0xff00) | (((unsigned short)(b)) >> 8))
+