RFR: 8160327: Support for thumbnails present in APP1 marker for JPEG [v2]

Thu Feb 13 23:46:13 UTC 2025

On Thu, 13 Feb 2025 23:19:35 GMT, Jeremy <duke at openjdk.org> wrote:

> I can scan all the JPEGs on my machine and see if I find one with properties that match other 2 jpeg files we may not have permission to share (exif-rgb-thumbnail, sharpshot-iphone).

At a minimum the test images should cover:

1. compressed (JPEG) main image, compressed (JPEG) thumbnail
2. compressed (JPEG) main image, uncompressed (RGB) thumbnail
3. uncompressed (RGB) main image, uncompressed (RGB) thumbnail

The case of an uncompressed main image with compressed thumbnail is not specified, if memory serves.

There are other cases than the above, e.g., YCbCr, but I would expect the above to cover most cases.

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PR Comment: https://git.openjdk.org/jdk/pull/22898#issuecomment-2657937708