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#66261: Media: Preserve AVIF sub-sizes when Imagick reports HEIC - #14129

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ArkaPrabhaChowdhury:trac-66261-avif-sub-sizes
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ArkaPrabhaChowdhury:trac-66261-avif-sub-sizes

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@ArkaPrabhaChowdhury

@ArkaPrabhaChowdhury ArkaPrabhaChowdhury commented Oct 9, 2026 •

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Imagick can label an AVIF upload as HEIC on ImageMagick 6, causing the default HEIC-to-JPEG mapping to convert its sub-sizes. When Imagick reports a HEIC-family format, check the file's actual MIME type and retain AVIF when detected. Add a regression test for AVIF sub-size output.

Trac ticket: https://core.trac.wordpress.org/ticket/66261

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Used for: Implementation and test drafting, code review, and validation.


This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

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The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

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Props arkaprabhachowdhury.

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@ArkaPrabhaChowdhury ArkaPrabhaChowdhury changed the title Media: Preserve AVIF sub-sizes when Imagick reports HEIC #66261: Media: Preserve AVIF sub-sizes when Imagick reports HEIC Oct 19, 2026
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