XnView Software

Posted: **Sun May 05, 2024 3:15 pm**

XnViewMP 1.7.1 64bit
Windows11 (23H2), display resolution 3840x2160, win scaling 150%

Viewer > Image > Adjust

Equalize
- issue with 32bit png w alpha channel

test_img_32bit_transparency.zip

(160.97 KiB) Downloaded 51 times

equalize_result.png (30.1 KiB) Viewed 1878 times

I doubt that this is desired result, eg in adobe:
The Equalize filter redistributes the brightness values of the pixels in an image so that they more evenly represent the entire range of brightness levels. When you apply this command, Photoshop Elements finds the brightest and darkest values in the composite image. It then remaps them so that the brightest value represents white and the darkest value represents black. Photoshop Elements then equalizes the brightness—that is, distributes the intermediate pixel values—evenly throughout the grayscale.

Posted: **Tue May 07, 2024 8:40 am**

user0 wrote: Sun May 05, 2024 3:15 pm Viewer > Image > Adjust
Equalize
- issue with 32bit png w alpha channel
test_img_32bit_transparency.zip

what's the problem?

Posted: **Tue May 07, 2024 9:01 am**

I've updated OP

Posted: **Mon May 13, 2024 7:43 am**

Thanks to your detailed description I can reproduce the problem.

Posted: **Tue Jun 04, 2024 8:23 am**

This problem is supposed to be fixed in XnView MP 1.7.2. Please check and confirm the bug fix here.

Posted: **Tue Jun 04, 2024 9:37 am**

172
issues still remain

Posted: **Thu Aug 29, 2024 1:19 pm**

This problem is supposed to be fixed in XnView MP 1.8.0. Please check and confirm the bug fix here.

Posted: **Thu Aug 29, 2024 1:48 pm**

fixed in 180

1.7.1 - effects - Equalize, Posterize - few issues