07-04-2021, 05:51 PM
This is a Gimp 2.8 Some possible causes:
1. Using empty clipboard brush
2. The layer visibility is OFF. Paints but nothing shows on canvas
3. The Alpha lock is ON. Not possible to paint on transparent layer.
4. The layer mode is incorrect. Also applies to the layer dialogue. Change to Normal
5. Brush opacity is zero
6. Brush is so small user can not detect (unlikely but can happen).
If none of those, please post a screenshot of the Gimp interface, layers, tool options...
1. Using empty clipboard brush
2. The layer visibility is OFF. Paints but nothing shows on canvas
3. The Alpha lock is ON. Not possible to paint on transparent layer.
4. The layer mode is incorrect. Also applies to the layer dialogue. Change to Normal
5. Brush opacity is zero
6. Brush is so small user can not detect (unlikely but can happen).
If none of those, please post a screenshot of the Gimp interface, layers, tool options...