This topic covers icons on the left bar:
| Icon | Description | Shortcut |
|---|---|---|
| Draw | Draw with various arithmetic modes | F1 |
| Colors | Manipulate/change image colors | F2 |
| Pixel shifting | Perform pixels shifting | F3 |
| Simple 3×3 filters | Apply predefined or user defined 3×3 filters | F4 |
| Ornaments | Draw ornaments with various symmetry options | F5 |
| Spreader | Spread, smudge or warp pixels under the brush | F6 |
| Image nozzle | Draw using image nozzle (tube) | F7 |
| Warping | Perform various image distortions | warping | F8 |
| Marker | Mark image area using current brush and perform various actions with marked area | F9 |
| IPP filters | Apply various fast IPP filters | Ctrl + F1 |
| IPP color twist | Manipulate image colors via color twist matrix | Ctrl + F2 |
| IPP general filters | Apply fast IPP general filter (cross-correlation) with variable kernel size | Ctrl + F3 |
| IPP compound filters | Apply various compound (multiple) filters in single pass | Ctrl + F4 |
TODO: explain relation between each action, brush parms, four cats. Mention “autobrush” option related to spreader.