Use more accurate bit for alpha lookup. #2473
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JimBobSquarePants
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tocsoft,
antonfirsov,
dlemstra and
brianpopow
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antonfirsov
approved these changes
Jun 13, 2023
| /// </para> | ||
| /// </remarks> | ||
| private unsafe struct ColorDistanceCache : IDisposable | ||
| { | ||
| private const int IndexBits = 5; | ||
| private const int IndexAlphaBits = 5; | ||
| private const int IndexAlphaBits = 6; |
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This could be zero when TPixel doesn't have an alpha. It might be worth to eventually implement some trick to have two versions of EuclideanPixelMap, so we save memory when working with RGB pngs and gifs.
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Good point. We could easily preserve much more accurate matches in less space.
This was referenced Jul 30, 2025
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Prerequisites
Description
Fixes #2469
Our pixel map accuracy wasn't good enough for alpha comparison, so we were leaving artifacts.
This increases memory from 2.26MB to 4.45MB but not only do we fix our issue, as a result of the increased accuracy, we're also getting less collisions in our RGB components.