SUMMARY When trying to fill an already created fill layer using the fill tool, the new color will change the transparency of the already existing color on the layer as if a transparency mask was applied to it instead of changing the color. STEPS TO REPRODUCE 1. open a new krita file 2. make a new fill layer with pure black 3 select from the color selector a random color that isn't pure white or pure black (for example light blue) 4. click on the fill layer with the fill tool, it is now grey 5. hide the background layer to see the checkers OBSERVED RESULT it is now a gradation of gray and the color is half transparent, despite the opacity of the layer being 100% EXPECTED RESULT change the color without changing the transparency, or maybe only being able to change the color by pressing f3 to open the fill window. Though it would be nice if it worked with the fill tool SOFTWARE/OS VERSIONS Windows 10 5.3.0-prealpha (git c1a25a3) ADDITIONAL INFORMATION if you keep filling with random colors you will see the the transparency changing like it would work for a transparency mask.
This happens because when you use a paint tool on the fill layer (or filter layer/mask as well, for example) you are actually modifying the mask that controls where the layer has effect, not the color/pattern/etc. To change the color you have to use the fill layer properties dialog.
(In reply to Deif Lou from comment #1) > This happens because when you use a paint tool on the fill layer (or filter > layer/mask as well, for example) you are actually modifying the mask that > controls where the layer has effect, not the color/pattern/etc. To change > the color you have to use the fill layer properties dialog. Ah that's great then! Do you think it would be possible to expose this mask to the user in the UI so it's easier to see and modify/control?
It is possible but it would require some ui/ux design i guess, and time to implement. You can create a feature request in the krita-artists forum about this, stating why it would be useful. Also the other users can give feedback as well.