Created attachment 138003 [details] sample .png file SUMMARY I have a png file converted from a tga source, using imagemagick. While this seems valid (I can see it in dolphin, open it in kolourpaint etc), it won't work with utilities like libpng. Metapicz.com reports the file contains errors. When I edit and save the file in kolourpaint, the errors remain. I can make a new file in kolourpaint, which then works with libpng, but the quality is unacceptable. STEPS TO REPRODUCE 1. Open .png file in kolourpaint 2. Edit file 3. Save file OBSERVED RESULT png data not updated EXPECTED RESULT png data updated SOFTWARE/OS VERSIONS KDE Plasma Version: 5.19.5 KDE Frameworks Version: 5.74.0 Qt Version: 5.14.2 ADDITIONAL INFORMATION Attached .png which can be used to demonstrate the problem.
What you attached is not a PNG file. According to "file sample.png" output: Targa image data - RGBA 40 x 40 x 32 - 8-bit alpha - top I assume you just renamed the file from .tga to .png instead really converting the format.