Background Images in FreeCAD
Commenting post 184: Background Images in FreeCAD
This feature is priceless for getting an item for reverse-engineering into CAD; I often begin with industrial art images from a century or more ago (often no modern 'blueprint' ever existed).
If an object of known (real world) dimensions is portrayed in the image, by use of a CAD reference line spanning the known dimension (initially this reference line will be proportional to the size of the image as imported), the entire image can be scaled to real world dimensions (or very nearly); this is quite advantageous as a starting point for reverse-engineering. It can allow one to reproduce the object in whole or in part, modify features, and also to design new parts to interact with the original assembly. Other significant design information becomes easier to approximate as well.
Well Done Yorick !!