XnView Software

Posted: **Sun Oct 22, 2023 8:06 pm**

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 2116 times

Posted: **Thu Oct 26, 2023 1:33 pm**

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

Posted: **Thu Oct 26, 2023 2:54 pm**

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
https://en.wikipedia.org/wiki/Pixel_aspect_ratio#Modern_standards_and_practices wrote: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

Posted: **Tue Oct 01, 2024 2:07 pm**

Thanks to your detailed description I can reproduce the problem.

Posted: **Thu Oct 10, 2024 2:47 pm**

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

Posted: **Thu Oct 10, 2024 3:46 pm**

fixed in 181

XnView Software

1.6.1 - viewer - incorrect rendering of image with unequal dpi

1.6.1 - viewer - incorrect rendering of image with unequal dpi

Re: 1.6.1 - viewer - incorrect rendering of image with unequal dpi

Re: 1.6.1 - viewer - incorrect rendering of image with unequal dpi

Re: 1.6.1 - viewer - incorrect rendering of image with unequal dpi

Re: 1.6.1 - viewer - incorrect rendering of image with unequal dpi

Re: 1.6.1 - viewer - incorrect rendering of image with unequal dpi