#define IMAGE_WALK_DO_STEP do{ pixel_conv_rgb_to_ycck(walk_pos, walk_sec_pos); }while(0)
#include "images/image-walk.h"
-/* YCCK <-> RGB */
+/* YCCK <-> YCbCr */
#define IMAGE_WALK_PREFIX(x) walk_##x
#define IMAGE_WALK_FUNC_NAME image_conv_ycck_4_to_ycbcr_n