Image conversion in MediaWiki is handled by ImageMagick or GD. Image are converted for several reasons, the commons is when thumbnails are created.

Known problems

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LAB color is not supported by ImageMagick at this moment.

How to

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Convert files with different colorspaces / colormodels: Check the colorspace of the original file and load this and a RGB colormodel using the -profile option. (this requires .icc or .icm files)

Convert PSD to JPG: When converting a PSD to a JPG format always make use of the -flatten command in ImageMagick, this makes sure the layers are removed.

Convert EPS to JPG: When converting a EPS, you need to have w:Ghostscript installed.