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+--- Thread: save image with mask layer to file with transparency (/Thread-save-image-with-mask-layer-to-file-with-transparency)
save image with mask layer to file with transparency - bitrat - 01-24-2021
How? Seems like something that should be straight forward.
Answering my own question here.
mask -> active layer
right click menu -> Mask to Selection
delete mask layer
image -> active layer
fill selection with key color
colors -> color to alpha [select key color]
file -> export as png
Is there a way to do this directly, without the step using color to alpha?
It would be nice if it could all be accomplished in one step.
RE: save image with mask layer to file with transparency - bitrat - 01-24-2021
(01-24-2021, 02:36 AM)bitrat Wrote: ...
Maybe I'll try some script-fu.
RE: save image with mask layer to file with transparency - Ofnuts - 01-24-2021
I can't wrap my head around what you are trying to do but it looks way too complicated anyway. If you use a layer mask (which you don't seem to be doing) you would skip most of this.
RE: save image with mask layer to file with transparency - bitrat - 01-24-2021
(01-24-2021, 08:57 PM)Ofnuts Wrote: I can't wrap my head around what you are trying to do but it looks way too complicated anyway. If you use a layer mask (which you don't seem to be doing) you would skip most of this.
I am using a layer mask. That's fine inside GIMP using the native .xcf format, but I want to export a .png file with transparency, with the alpha channel matching the mask.
This seems so obvious and basic I can't believe it's not a built in command. Maybe it is, but I haven't found it.
RE: save image with mask layer to file with transparency - Ofnuts - 01-25-2021
(01-24-2021, 09:06 PM)bitrat Wrote:(01-24-2021, 08:57 PM)Ofnuts Wrote: I can't wrap my head around what you are trying to do but it looks way too complicated anyway. If you use a layer mask (which you don't seem to be doing) you would skip most of this.
I am using a layer mask. That's fine inside GIMP using the native .xcf format, but I want to export a .png file with transparency, with the alpha channel matching the mask.
This seems so obvious and basic I can't believe it's not a built in command. Maybe it is, but I haven't found it.
That works for me. If I export the attached XCF to PNG, I get the expected result. Maybe you have to force the pixel format in the PNG dialog.
[attachment=5547]
RE: save image with mask layer to file with transparency - bitrat - 01-25-2021
Hmm, thanks! Yes that works. I was doing the layer mask wrong, so a big help all round! :-)