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.
Convert IGES 3D exchange format to JPEG bitmap image format.
We have found 3 software records in our database eligible for .iges to .jpeg file format conversion.
Microsoft Windows software - convert iges to jpeg on Windows
A CAD and Gerber conversion software
Convert from iges file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned iges to jpeg. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A 3D CAD translation softwate
A 3D product data optimalization software