0.91 beta 1 - Export dialog - Switching JPEG to GIF shows incorrect preview image

Reported bugs that have been closed and/or resolved

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masterjp
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Location: Duesseldorf, Germany

0.91 beta 1 - Export dialog - Switching JPEG to GIF shows incorrect preview image

Post by masterjp »

I switched some settings in export dialog for "JPEG" and went to the "GIF" format tab. Then I saw a wrong preview image.

Here are the steps I did to get the preview image colour errors:

1. Load a picture in xvniewmp
2. File => Export ...
3. "JPEG" tab (is the default)
4. Switch colour mode: 16M to greyscale
5. Choose "GIF" tab

The colour mode is set to 256 colours, but the image colours are very dark and wrong.
test3.jpg
PC: Intel 8700k + Asus Z370-F + 16 GB RAM G.Skill + Asus RTX 3050 OC + Samsung SSD
OS: Windows 10 Pro 64bit 22H2 |
GFX: XN-View 2.51.5 | XnViewMP 1.6.5 | XnConvert 1.100.1 | Adobe Photoshop Elements 2024 | Elements XXL 11 | Paint.Net
cday
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Re: 0.91 beta 1 - Export dialog - Switching JPEG to GIF shows wrong preview image

Post by cday »

Have you tried different Dithering settings, and do you have a Transparency setting, which probably isn't appropriate? Have you tried a different image?

No problem on an image I tested using 0.89, except for some slight banding artefacts with Dithering set to Adaptive, I can't test Transparency settings as I only have 0.89 0n my laptop.

Otherwise possibly a bug in the new version.
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masterjp
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Joined: Fri Feb 13, 2009 4:37 pm
Location: Duesseldorf, Germany

Re: 0.91 beta 1 - Export dialog - Switching JPEG to GIF shows wrong preview image

Post by masterjp »

I opened other pictures and get the same colour errors and a dark preview.
If I switch back from GIF tab to JPEG tab, the preview image will be correct.

I think switching from JPEG tab with colour mode "greyscale" to GIF tab with default colour mode "256" will produce a preview image with unknown default settings which do not match with the GIF tab settings.

Transparency is not used. Other dithering modes Floyed-Steinberg, etc. did not help.

Here is another example:
xnmp.jpg
PC: Intel 8700k + Asus Z370-F + 16 GB RAM G.Skill + Asus RTX 3050 OC + Samsung SSD
OS: Windows 10 Pro 64bit 22H2 |
GFX: XN-View 2.51.5 | XnViewMP 1.6.5 | XnConvert 1.100.1 | Adobe Photoshop Elements 2024 | Elements XXL 11 | Paint.Net
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xnview
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Re: 0.91 beta 1 - Export dialog - Switching JPEG to GIF shows wrong preview image

Post by xnview »

right will be fixed for beta 2
Pierre.
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xnview
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Re: 0.91 beta 1 - Export dialog - Switching JPEG to GIF shows wrong preview image

Post by xnview »

This problem is supposed to be fixed in XnView MP 0.91 beta 2. Please check and confirm the bug fix here.
Pierre.
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masterjp
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Joined: Fri Feb 13, 2009 4:37 pm
Location: Duesseldorf, Germany

Re: 0.91 beta 1 - Export dialog - Switching JPEG to GIF shows incorrect preview image

Post by masterjp »

This problem is solved with 0.91 beta #2. Thank you!
PC: Intel 8700k + Asus Z370-F + 16 GB RAM G.Skill + Asus RTX 3050 OC + Samsung SSD
OS: Windows 10 Pro 64bit 22H2 |
GFX: XN-View 2.51.5 | XnViewMP 1.6.5 | XnConvert 1.100.1 | Adobe Photoshop Elements 2024 | Elements XXL 11 | Paint.Net
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