Viewer - png - tRNS transparency - add save/edit for all variations

Ideas for improvements and requests for new features in XnView MP

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user0
XnThusiast
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Joined: Sat May 09, 2015 9:37 am

Viewer - png - tRNS transparency - add save/edit for all variations

Post by user0 »

XnViewMP 1.8.2 64bit
Windows11 (24H2), display resolution 3840x2160, win scaling 150%


Viewer - png
there is no full support (view/save/edit) of png 'cheap alpha' transparency (via tRNS values), which is inconvenient
viewer_png_add_transparency_save_edit_support.png
test files


Suggestion
  • add save/edit support for all transparency variations via tRNS chunk
    • save
    • edit
      - add visualization of alpha value on index map (eg same as in TweakPNG)

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




Example
  • tweakPNG
    other_apps_tweakPNG_transparency.png




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