Bug 432630

Summary:	Low-contrast display of 8-bit images
Product:	[Applications] gwenview	Reporter:	Zoltan Laszlo Ferenci <ferenci84>
Component:	general	Assignee:	Gwenview Bugs <gwenview-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	major	CC:	ferenci84, idontfeelcomfygivingyoumyemail, nate, tobias
Priority:	NOR
Version First Reported In:	Other (add details in bug description)
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	comparison between the different pictures in gwenview and firefox

Description Zoltan Laszlo Ferenci 2021-02-08 08:42:48 UTC

SUMMARY
The color management of Gwenview results in image having lower contrast images. The problem persists for several years, over several Cannon cameras used (Cannon 30D, 10D, 5D), and several different RAW converters. 16 bit images were always working well, and I used to think that 8 bit images are just that worse and continued to export only 16-bit images, until I found that the very simple and stupid basic windows image browser shipped with Windows 7 can show the colors I wanted to see on my images even on 8-bit photos. The images are also showing well in Google Chrome, Firefox, Geegie image viewer.

Example:
https://ferenci84.s3.amazonaws.com/Compare_JPG_Exported.png

STEPS TO REPRODUCE
1. Use the images: https://ferenci84.s3.amazonaws.com/Gwenview_Bug.zip
2. Open the same image with chrome or any other browser, or in Windows image viewer and compare with one opened with gwenview.
3. Compare the colors

OBSERVED RESULT
The colors shown by gwenview is different, especially the contrast is much lower. 

EXPECTED RESULT
The colors should be the same as other viewers

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Ubuntu 18.04.5
(available in About System)
KDE Plasma Version: 5.12.9
KDE Frameworks Version: 5.44.0
Qt Version: 5.9.5

Comment 1 Tobias Schula 2022-10-22 08:39:47 UTC

Created attachment 153107 [details]
comparison between the different pictures in gwenview and firefox

It seems like you have some misconfigured color management. With my display profile (close to P3, hence the washed out colors in the screenshot) set up in kde and firefox the colors are the same in all pictures. For Firefox and Chrome it is not sufficient to set up the display profile in the color management module in kde systemsettings, you must also load it with xcalib or dispwin from the argyll package.

Comment 2 A Linux User 2025-08-25 10:22:01 UTC

Thank you for the bug report. Unfortunately we were not able to get to it yet. Can we ask you to please check if this is still an issue with Gwenview 25.08.0?

Comment 3 Bug Janitor Service 2025-09-09 03:48:18 UTC

🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!

Comment 4 Bug Janitor Service 2025-09-24 03:47:18 UTC

🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.