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After I have run overlap.pl the mosaic doesn't have the patchiness, but it now displays an overall gradient. Is it real or was it introduced by overlap.pl?
Posted by IRSA HelpDesk on 11 March 2013 01:43 PM
The chances are that it's neither of the above. Most likely the overall gradient in the mosaic image comes from the gradients in the input images, which were not properly flat-fielded. This is sometimes seen in MIPS-24 images. Perl script flatfield.pl, included in the MOPEX distribution, should take care of this problem, or you can carry out your own flatfielding of the input images with your favourite software. Once the images are properly flat-fielded, you can re-run them through MOPEX to create your mosaic.
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