I have used UAE for getting screenshots long long time ago, DOS version on 486. I remember that if you want 100% exact same colour palette as Amigas, you need to use 24-bit color.
16-bit won't do..
Later you can use 32 indexed colors and save as .png (sometimes 64 IIRC, Photoshop or similar knows how many exactly)
I made 100s of games screenshots that way but it took a lot of time on 486 :roll: