[imageio] Fix reading of palette-based PNGs with transparency#18031

Merged

TurboGit merged 2 commits intodarktable-org:masterfrom victoryforce:fix-17991

Dec 23, 2024

+10-3

Commits on Dec 19, 2024

We have restricted the call conditions of png_set_strip_alpha too much
victoryforce
committed
Explain the purpose of introducing dt_imageio_png_read_header and dt_imageio_png_read_image
victoryforce
committed