Do not store obsolete tRNS chunk data following processing. - #2975
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Pull Request Overview
This PR fixes an issue where obsolete tRNS (transparency) chunk data was being preserved in PNG files after image processing. The change ensures that when a PNG has transparency information but the color type changes during processing, the metadata is properly updated to reflect the new state.
- Updates the
AfterImageApplymethod to handle transparency metadata cleanup - Converts RGB images with transparency to RGBA format and clears obsolete transparency data
- Converts Grayscale images with transparency to GrayscaleWithAlpha format and clears obsolete transparency data
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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Description
Fix #2974