Xnview image viewer supports great number of picture formats including the IMG and ABS and can even convert some of them between various formats. So it is probably your only choice for converting these two file formats, because they seem to be rather uncommon.
Home > Search converters: img to abs
Conversion of img file format to abs file format beta
Search for img to abs converter or software able to handle these file types.
Convert Bitmap picture to Optocat picture image.
Unfortunately, there is no detailed software record in the database that match this conversion.
Additional links: img file extension details, abs file extension details
IMG
Files with img file extension can also be commonly found as various bitmap images in more than dozen different formats, including ADEX, Erdas, GEM, Radiance, VICAR, Analyze etc.
ABS
An abs file extension is related to the Optocat, an obsolete picture file format, but still viewable in XnView picture image viewer.
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