convert a high dynamic range (more than 24-bit color) image down to 24-bit color using dithering.
it does not seem straightforward to do with Netpbm. it seems like a good feature that could be added to pamdepth. maybe it's possible by providing a colormap with all 2^24 colors to pnmremap.
if one is both downscaling in resolution and reducing color depth, I think the correct order is resolution first, then color depth.
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