| ::get_grayval | Access the gray values of an image object. |
| ::get_image_pointer1 | Access the pointer of a channel. |
| ::get_image_pointer3 | Access the pointers of a colored image. |
| ::paint_gray | Copy the gray values of an image into another image. |
| ::paint_region | Paint a region in an image with a constant gray value. |
| ::set_grayval | Set single gray values in an image. |