Windows11 (24H2), display resolution 3840x2160, dpi scale 150%
Viewer/Browser(Preview) - png - tRNS transparency
png transparency via tRNS chunk (aka 'cheap alpha') turns out to be a bit more complicated
Issue A - fixed in 1.11.4
test images 3, 6 are rendered w/o transparency (Viewer/Browser thumbnails, preview)
Issue B
state of transparency controls (enabled/disabled) needs to be adjusted (in Viewer > View menu)
Issue C
the following transparency controls do not work when some antialiasing filters are applied (eg zoom>100%):
- Use transparency index
- Use alpha channel
- Show alpha
ref
https://www.w3.org/TR/png-3/#11transinfo
http://www.libpng.org/pub/png/book/chap ... ch08.div.5
http://www.libpng.org/pub/png/spec/1.2/ ... C.Anc-trns
Related
- issues
1.8.2 - view - png - tRNS transparency - viewing issues (current post)
1.7.1 - viewer - antialiasing - border at the edge of transparent png
1.3.0 - view - scaling - transparency grid issue
- todo -
1.12.2 - viewer - antialiasing - bilinear shifts image
1.12.2 - viewer - antialiasing - settings enforcement
- fixed -
1.8.0 - viewer - antialiasing - issue with dpi scaling (1.12.2)
1.8.8 - viewer - png - alpha transparency - clipboard issues (1.11.4)
1.6.5 - view - transparent index visible when zooming (1.8.1)
1.7.2 - viewer - Show alpha became disabled (1.8.0)
1.5.0 - viewer - antialiasing - None still affects image (1.7.0)
1.4.3 - viewer - antialiasing + HiDPI - extra space on zoom (1.5.0)
1.4.0 - viewer - antialiasing + Change color depth issue (1.5.0)
1.4.4 - viewer - antialiasing - state out of sync (1.4.5)