| CrtImgType | Define new kind of image |
| CrtItemType | Define new kind of canvas item |
| CrtPhImgFmt | Define new file format for photo images |
| DeleteImg | Destroy an image. |
| FindPhoto | Manipulate the image data stored in a photo image. |
| GetBitmap | Maintain database of single-plane pixmaps |
| ImgChanged | Notify widgets that image needs to be redrawn |
| NameOfImg | Return name of image. |