Could libimagequant be extended to more than 256 colours?

[cmeister2]

My use case is that I want to map images into the DMC Colour Chart, which has a palette of around 447 colours in it. Most programs are designed to map into a colour space of 256 colours or less; currently libimagequant appears to be one of those. My question is whether there's an easy path to being able to define a larger colour space without raising errors.

[kornelski]

It can work, but you need to modify the source:

libimagequant/src/pal.rs

Lines 200 to 207 in dc3e6d1

	#[cfg(feature = "large_palettes")]
	pub type PalIndex = u16;
	#[cfg(not(feature = "large_palettes"))]
	pub type PalIndex = u8;
	/// This could be increased to support > 256 colors in remapping too
	pub type PalIndexRemap = u8;