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+--- Thread: Bug when using Color to Alpha on selected area (/Thread-Bug-when-using-Color-to-Alpha-on-selected-area)
Bug when using Color to Alpha on selected area - wpkzz - 03-12-2023
Fellow Image Manipulators:
I have this problem with GIMP when trying to make a selected area transparent so that part of an underlying photo is shown in the foreground image.
Using two layers, one of a photo under, a drawing above, I select by any method, but usually, Quick Mask, part of the drawing. I then proceed to fill the selection White, and then I order, "White to Alpha". In the preview it shows exactly what is intended, namely, the selected area is transparent and it shows part of the photo below. But once I push "Accept", then one of two possible weird things happen.
One is that if the Under Layer has a size as the canvas size, ALL of the drawing gets more or less transparent, as if by its content of "white". But it gets quite transparent.
The other is if the under layer is in size a fraction of the canvas, the whole part of the upper layer outside the size of the under layer gets this "partial but almost transparent" effect", the selected intended size gets the full transparent, and, the part above the area of the under layer that is not selected, is alright, that is, not transparent.
So I end with only that "margin" right, and everything else wrong.
RE: Bug when using Color to Alpha on selected area - Ofnuts - 03-13-2023
Can you add before/after screenshots?
RE: Bug when using Color to Alpha on selected area - wpkzz - 03-24-2023
(03-13-2023, 08:36 AM)Ofnuts Wrote: Can you add before/after screenshots?
Yes, sorry for the late reply, I think I can. Let me check on that.
RE: Bug when using Color to Alpha on selected area - sallyanne - 03-26-2023
wpkzz where are your screen shots?
The alpha to transparency should only happen on the selected layer.
Add your picture as a layer after you have done the drawing then you cannot select the wrong one. You can move your picture down underneath after as well
Also move it, scale if need be etc. As long as that layer is selected.