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

Post by masterjp » Fri Jun 08, 2018 5:47 pm

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
OS: Windows 10 Pro x64 | XN-View 2.44 | XN-View MP 0.91 | Adobe Photoshop Elements 15 & Photoshop XXL

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

Post by cday » Fri Jun 08, 2018 6:13 pm

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

Post by masterjp » Fri Jun 08, 2018 6:31 pm

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
OS: Windows 10 Pro x64 | XN-View 2.44 | XN-View MP 0.91 | Adobe Photoshop Elements 15 & Photoshop XXL

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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 » Sat Jun 09, 2018 3:41 pm

right will be fixed for beta 2
Pierre.

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

Post by xnview » Thu Jun 28, 2018 3:52 pm

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

Post by masterjp » Fri Jun 29, 2018 5:43 pm

This problem is solved with 0.91 beta #2. Thank you!
OS: Windows 10 Pro x64 | XN-View 2.44 | XN-View MP 0.91 | Adobe Photoshop Elements 15 & Photoshop XXL

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