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Semi-transparency blends differently before and after PNG-export
#1
Hi. Sorry for the generic title but I couldn't explain the problem I'm facing in a few words.

I'm facing this weird problem: I start with an image (a hand drawn picture made with Sketchbook, exported in photoshop format and imported in Gimp 2.10.18) that only contains a layer with semi-transparent black drawings, and a background white layer. Gimp imports it correctly, or at least everything looks good. If I hide the white layer and I export only the black-and-transparent layer into PNG, and then I open the exported image I have this behaviour: the image look the same, but when I add again a white background layer, the image blends differently with it, it looks washy, with less contrast and with lighter blacks. I attach an example to illustrate the behaviour.

As you can see in the picture below, the exported PNG looks the same until I add a background again.

Does anyone knows what's happening here?


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Semi-transparency blends differently before and after PNG-export - by M1rch - 05-03-2020, 06:34 PM

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