1.6.1 - viewer - incorrect rendering of image with unequal dpi

[user0]

XnViewMP 1.6.1 64bit
Windows11 64bit (22H2), display resolution 3840x2160, win scaling 150%

Viewer
incorrect rendering of image with unequal horizontal/vertical dpi

To reproduce:
1. run clean portable XnViewMP
2. open test image (dpi H144 V72)

test_img.zip

(34.19 KiB) Downloaded 68 times

3. press SHIFT+R/L
4. zoom-out to any value between 51-99%
image will be displayed incorrectly

test_img_rot.jpg (41.05 KiB) Viewed 2111 times

[yacomi9014]

Is this the same as viewtopic.php?p=193179 ?

[user0]

nope, they both related to images with unequal horizontal&vertical dpi, however

• your case
  dpi in your photo is incorrect, you have to fix it

  Modern standards and practices
  In modern digital imaging systems and high-definition televisions, especially those that comply with SMPTE standards and practices, only square pixels are used for broadcast and display.

• my case
  there is a bug with rendering (color shift & stripes) of such images under certain conditions

[xnview]

Thanks to your detailed description I can reproduce the problem.

[xnview]

This problem is supposed to be fixed in XnView MP 1.8.1. Please check and confirm the bug fix here.

[user0]

fixed in 181