04-25-2022, 08:07 AM
(This post was last modified: 04-25-2022, 08:30 AM by rich2005.
Edit Reason: typo
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Quote:...I followed all the instructions, used "color to alpha" mode on the smaller/superimposed photo, erased all the parts I didn't want included in the photo, opened up both the background photo and superimposed photo as layers..
Who gave those instructions ? It is indeed one way of adding to a base image.
Your problem is the colour-to-alpha (c2a) by default removes all the selected background colour, often white but can be any solid colour. Your image will show transparency (the checker pattern) through the foreground.
With Gimp 2.10 c2a there is an additional slider, Opacity Threshold, adjust that to improve the image.
That can have consequences, a unwanted border of the old BG colour. Remove that before adding to the background image. Layer > Transparency > Alpha-to-selection then Selection > Shrink by a couple of pixels Now copy > Paste into the main image.
An animation of that: https://i.imgur.com/eaM0zbc.mp4
No doubt someone will come along with a plugin reference that does all that automatically but it is worth knowing what is going on.
Other ways, and probably what I would use. The figure added as a new layer and a layer mask to remove the BG.