06-17-2021, 08:59 PM
Yikes, this is embarrassing, but I will share it anyway. In looking to create a small example to reproduce and digging deeper into the issue I discovered that the colors are correct in the immediate PNG output from GIMP, but another downstream process (using Image Magick) that makes a lower-resolution web-ready version of the PNG is where the colors are getting changed slightly. I mixed up the two files in my earlier analysis. Thanks again I do appreciate the help.