How to reduce color depth to a specified palette?

[wonder_boke]

Is there a way, in any program, to specify an allowed palette of colors and automatically reduce the color depth of an image to that palette?

I know you can do that in mtPaint.

You'd crop out one monster, do "Image > Convert to RGB" if necessary, then edit the palette until it has the colors you want. Then you can do "Image > Convert to Indexed" and use the "Use Current Palette" option with Dithering set to "None". Then assemble monsters into one sheet afterwards.

Thanks, I'm gonna try this when I get home!

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How did you rip these sprites? Ingame screenshots, tile viewer or recorded video file?

I recorded a video of me playing the game at 4x integer scale, took screenshots of that video file and ripped from them manually.

I need to find a way to record videos without any color compression if I want to do it again like this.