Drawable filter preview on layer masks doesn't look like final result on 8-bit images
Submitted by Bastian Ilsø Hougaard
Created attachment 372244 xcf for bug reproduction
I am using GIMP to create a transparent background for a product shot (8-bit image). To do this I am trying to apply a Gradient in "Multiply" mode to a layer mask I created of my image.
"preview_gradient.png" shows a smooth gradient between black and to the layer mask color. But when I press Enter, I get different results (seen in "applied_gradient.png"). The result look much more jaggy than the preview, which I did not expect.
I am using GIMP 2.10.0 in flatpak. To workaround this, I tried changing blend color space, dithering/adaptive supersampling/legacy-mode/other "darken" blend modes too but without much luck (they all yield different results but none of the results looks as good as the preview, they all suffer from the same "look").
Attachment 372244, "xcf for bug reproduction":