How to make the printer support 'bmp16m' image type instead of 'postscript'?

[houranled]

How does CUPS find out all the filters which can be used for converting image in the shortest path for the input image and the specified printer?
How can I modify a printer's configuration to support 'bmp16m' image type instead of 'postscript'?

[ValdikSS]

The conversion chain is described in *.convs and *.types files.
Check /usr/share/cups/mime path.

https://www.cups.org/doc/man-mime.types.html
https://www.cups.org/doc/man-mime.convs.html

If you want your printer (by that you mean filter I assume) to receive bmp16m, you need to define that MIME type by some kind of unique identifier of this file type in .types file, and then modify the cupsFilter option of your PPD file with that type.