A preview image from a 3D part or CAD drawing can be probably saved using some kind of export function in CAD software. This will just create a plain static image of the model/part/drawing, which cannot be further edited as CAD file, just like a picture. So it is possible to export IGES model (.igs, .iges) as .jpg files, which is what igs to jpg conversion represents.
Updated: April 26, 2022
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