1.3.0 - view - scaling - transparency grid issue

[user0]

XnViewMP 1.3.0-1.12.2
Windows11 (26H2), display resolution 3840x2160, dpi scale 150%

Viewer/Browser - transparency grid
transparency grid scaling issue

to reproduce
0. prerequisites

• set win dpi scaling to 150%

• change Transparency grid color/size (yellow-pink/25px) to make it more noticeable (in Settings>View)

• have test images w transparency (100x100px, 1-32bit)
  test_img_transparency_grid_1.zip

Issue A - fixed in 1.9.9
1. open test image in Viewer, zoom 100%
Transparency grid will be ~37x38 (25x25px * 1.5)
expected
no need to scale transparency grid


Issue B

transparency_grid_scale_issue.png

Issue B1
1. open test image in Viewer (OR Browser - Preview), zoom 100%
transparent layer has 24x24 grid and 101x100 size
Issue B2
1. open test image in Browser
2. increase thumbnail size to be >100px
transparent layer has ~24x24 grid, 99x99 size and is blurry


Issue C
1. open test image in Viewer, zoom 100%
2. turn off transparency
- for 4bit image - uncheck 'Use transparency index' (Ctrl+Alt+H)
- for 32bit image - uncheck 'Use alpha channel' (Ctrl+H)
transparency will turn off - OK
transparent grid will still be rendered (visible on the sides)
expected
when turning off transparency, maybe disable transparency grid as well, as its not supposed to be visible anyway









Related

• issues
  1.8.2 - view - png - tRNS transparency - viewing issues
  1.7.1 - viewer - antialiasing - border at the edge of transparent png
  1.3.0 - view - scaling - transparency grid issue (current post)
  - 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)

• suggestions
  View - add Use channel commands
  View - transparency grid - zoom with image
  Viewer - png - tRNS transparency - add save/edit for all variations
  Edit palette - indexes selection, color and transparency
  - done -
  Menu - View - improve channel commands (1.9.0)

[XnTriq]

Is Zoom on HiDPI screen: 1 image pixel equals 1 screen pixel in Tools → Settings… → View → View activated, user0?

[user0]

Is Zoom on HiDPI screen: 1 image pixel equals 1 screen pixel in Tools → Settings… → View → View activated, user0?

Nope, it is not checked by default.

However, I can confirm that the issue is gone when this box is checked.

It's worth mentioning that the issue is gone if the alpha channel is removed from the png image.
Also no such issue in XnView Classic.

[XnTriq]

However, I can confirm that the issue is gone when this box is checked.

I believe that this setting turns DPI awereness on and off.

[xnview]

Thanks to your detailed description I can reproduce issue 1 & issue 2.