Color quantization is a legacy feature that serves little or no purpose
with lossless JPEG images. 9f756bc67a
eliminated interaction issues between the lossless decompressor and the
color quantizers related to out-of-range 12-bit samples, but referring
to #701, other interaction issues apparently still exist. Such issues
are likely, given the fact that the color quantizers were not designed
with lossless decompression in mind.
This commit reverts 9f756bc67a, since the
issues it fixed are no longer relevant because of this commit and
2192560d74.
Fixed#672Fixes#673Fixes#674Fixes#676Fixes#677Fixes#678Fixes#679Fixes#681Fixes#683Fixes#701
bf9f319cb4