IIRC raw is specific to cameras; there is is embedded info in a RAW that doesn't exist to embed in a screenshot.
But, again IIRC, I think it
should generally be possible to save screenshots as a .png, which is a lossless format well suited for editing.
A useful search string might be 'lossless screenshots windows 57.3', or whatever OS/program you are using..
'Theoretically this level of creeping Orwellian dynamics should ramp up our awareness, but what happens instead is that each alert becomes less and less effective because we're incredibly stupid.' - Jerry Holkins