Too many different .cap files exists, so it's hard to give a specific answer except that is certainly export of graphics. This is certainly possible, you just have to pick software based on the desired CAP format.
It might also be possibly recovery of music sheets from JPEG pictures to use in Capella notation software, in which case you have to use some OMR solution to get MusicXML file from it and import that file to Capella. Latest versions of Capella might support OMR directly, but it's usually from PDF files.
Updated: August 25, 2023