andrews05 174f36ad8f

Improve indexed to grayscale conversion (#674) ...

If no palette reduction occurred (or palette reductions were off), a
fully transparent palette entry may not have been zeroed to black. By
ensuring this gets cleaned in the `indexed_to_channels` transformation,
we may able to achieve a grayscale conversion that would otherwise have
been RGB.

This is the final piece of the puzzle in #649 to achieve better file
sizes on the first run and avoid further changes on a second run.

Results from the images in #649 (combining this PR and #673):
9.1.3 1st run: 2,191,773
9.1.3 2nd run: 2,191,629
PR 1st run: 2,191,380
PR 2nd run: 2,191,380

2025-02-02 18:26:18 +01:00

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