| clear | Delete an iconic object from the HORUS database. |
| clear_image | Set the gray values of an image to a specified value. |
| concat_obj | Concatenate two iconic object tuples. |
| copy_obj | Cpoy an iconic object in the HORUS database. |
| dup_image | Copy an image and allocate new memory for it. |
| empty_obj | Create an empty object tuple. |
| integer_to_obj | Convert a ``integer number'' into an iconic object. |
| obj_to_integer | Convert an iconic object into a ``integer number.'' |
| paint_grey__ | Copy the gray values of an image into another image. |
| paint_region__ | Paint a region in an image with a constant gray value. |
| select_obj | Select an object from an object tuple. |
| set_greyval__ | Set single gray values in an image. |