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Colors messed up when exporting GIF

Posted Apr 4, 2012, 1:30 p.m. EDT Version 4.3a 4 Replies

Azer Faraclas
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Hello,

When I export a GIF from COMSOL, often times the color scheme will be all messed up.

Instead of a fluid change from blue to red, I will see about 16 distinct colors. This looks terrible and is not what is shown when I export a still image.

Also, sometimes the colors will be replaced as black on large domains, completely blocking out the domain.

This is not an issue on just my computer. It is happening to my entire lab. I am running version 4.2.

Has anyone else seen this before?

~Azer
4 Replies Last Post Apr 11, 2013, 8:37 a.m. EDT
COMSOL Moderator

Hello Azer Faraclas

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Jonathan Singer
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Posted: 1 decade ago Apr 10, 2013, 9:45 a.m. EDT
Know this is an older post, but I am having the same problem with exporting gifs/images from 3D: all result in solid black images. Is there any known solution to this?
Know this is an older post, but I am having the same problem with exporting gifs/images from 3D: all result in solid black images. Is there any known solution to this?
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Apr 10, 2013, 12:39 p.m. EDT
Hi

what OS and version do you have ?
I have no probem on a PC Win7-64 and v4.3a patched

--
Good luck
Ivar
Hi what OS and version do you have ? I have no probem on a PC Win7-64 and v4.3a patched -- Good luck Ivar
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago Apr 10, 2013, 5:26 p.m. EDT
Could be an issue with the GIF format which supports 256 colors only (8-bits). I usually export animations as AVIs with a high Quality factor setting.
Could be an issue with the GIF format which supports 256 colors only (8-bits). I usually export animations as AVIs with a high Quality factor setting.
Jonathan Singer
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Posted: 1 decade ago Apr 11, 2013, 8:37 a.m. EDT
Thank you for your quick response. The computer is RedHat linux and the version is 4.3a, so avi is not an option, but this also occurs with png exports. This was not an issue with 2D simulations or even smaller 3D. I found a workaround yesterday which was to switch the size from manual (which was the default) to current. Not sure why this would make the difference, but it is good enough for now as I shouldn't need custom gif sizes.
Thank you for your quick response. The computer is RedHat linux and the version is 4.3a, so avi is not an option, but this also occurs with png exports. This was not an issue with 2D simulations or even smaller 3D. I found a workaround yesterday which was to switch the size from manual (which was the default) to current. Not sure why this would make the difference, but it is good enough for now as I shouldn't need custom gif sizes.

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