Commits on Aug 2, 2023

1. Speed up Lab conversion with Srgb/LinSrgb fast path …

   Srgb/LinSrgb conversion between u8 and f32/f64 has been special-cased
   to use a lookup table and approximation. This PR uses that
   implementation where possible.
   
   Speedup gains increase as image size increases. On a 4500x3000 image,
   a 44% speedup was seen reducing the time from 7.8s to 4.3s after
   switching from `into_format` to using `into_linear`. The speedup is
   closer to 15-17% on smaller images (320x200) but still noticeable
   when measured.
   
   Swap to using palette's FromStr implementation for colors. Now 3 or 6
   digit hex colors are permitted.

   

   okaneco committed Aug 2, 2023
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