1.3.0 - view - scaling - transparency grid issue

[user0]

XnViewMP 1.3.0-1.9.8
Windows11 (25H2), 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 more noticeable (in Settings>View)

• have test images w transparency (100x100px, 4 and 32bit)

  test_img_transparency_grid.zip

  (1.84 KiB) Not downloaded yet

Issue A1
1. open test image in Viewer, zoom 100%
Transparency grid will be ~37x38 (25x25px * 1.5)
expected
no need to scale transparency grid

Issue A2
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 be rendered as well (visible on the sides)
expected
when turning off transparency, maybe disable transparency grid as well, as its not visible anyway


Issue B - image distortion1
1. open test image in Viewer, zoom 100%
image will be distorted
transparent grid will be visible on the right and bottom sides

B.png (1.01 KiB) Viewed 13 times

expected
render w/o distortion, like the same image w/o transparency
to double check - remove transparency from image, save and reopen
image will be rendered w/o any distortion at 100x100px


Issue C - image distortion2
1. open test image in Viewer, zoom 100%
2. turn on transparency
- for 4bit image - uncheck 'Use transparency index' (Ctrl+Alt+H)
- for 32bit image - uncheck 'Use alpha channel' (Ctrl+H)
3. repeat steps 2 and 3 (quickly for better visibility)
transparency will turn on/off - OK
image will shift (could be related to this shifting as zoom-out antialiasing filter applies at 0-149% range)

C.gif (1.43 KiB) Viewed 13 times

Example

• Bridge
  thumbnails have similar problem of image-transparency grid alignment at certain sizes (any dpi)

  

  other_apps_bridge_thumbnails.png (4.57 KiB) Viewed 4 times

Related

• issues
  1.8.2 - view - png - tRNS transparency - viewing issues
  1.3.0 - view - scaling - transparency grid issue (current post)
  - todo -
  1.8.8 - viewer - png - alpha transparency - clipboard issues
  1.8.0 - viewer - antialiasing - issue with dpi scaling
  1.7.1 - viewer - antialiasing - border at the edge of transparent png
  - fixed -
  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
  Viewer - png - tRNS transparency - add save/edit for all variations
  Edit palette - indexes selection, color and transparency
  - done -
  App UI - menu structure - 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.