WIP: Add JPEG XL import/export with OpenImageIO #118989

Peter Kovář · 2024-03-01T22:45:08+01:00

Peter Kovář commented

2024-03-01 22:45:08 +01:00

First-time contributor

This PR adds JPEG XL I/O based on Initial JPEG XL support for image input/output #4055

Signed-off-by: Peter Kovář peter.kovar@reflexion.tv

This PR adds JPEG XL I/O based on [Initial JPEG XL support for image input/output #4055](https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/4055) Signed-off-by: Peter Kovář <peter.kovar@reflexion.tv>

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Peter Kovář added 1 commit 2024-03-01 22:45:19 +01:00

252b02dd8b Add JPEG XL import/export with OpenImageIO

Signed-off-by: Peter Kovář <peter.kovar@reflexion.tv>

Jesse Yurkovich changed title from ~~Add JPEG XL import/export with OpenImageIO~~ to WIP: Add JPEG XL import/export with OpenImageIO

2024-03-02 22:35:15 +01:00

Jesse Yurkovich commented

2024-03-02 22:35:32 +01:00

I've added the "WIP" tag to the title as I think it's a bit too early to review this on our side.

We'll need to wait for OIIO to actually accept the patch AND for them to make an official release with the changes before spending time here.

Logistics:
The platform maintainers first need to decide if they're willing to accept a new dependency on libjxl because we'll need precompiled libraries and build system support for all the platforms if we decide to support the format at all.

Then the next opportunity to update our library dependencies, for OIIO and libjxl, is around the transition from bcon1 to bcon2 scheduled for May 1st, so that would be the earliest that a commit on Blender's side could be made. This assumes OIIO has made an official release by then.

I'll comment on the upstream patch as I have further questions about support for different bit-depths, compression settings, and alpha channel processing.

I've added the "WIP" tag to the title as I think it's a bit too early to review this on our side. We'll need to wait for OIIO to actually accept the patch AND for them to make an official release with the changes before spending time here. Logistics: The platform maintainers first need to decide if they're willing to accept a new dependency on `libjxl` because we'll need precompiled libraries and build system support for all the platforms if we decide to support the format at all. Then the next opportunity to update our library dependencies, for OIIO and `libjxl`, is around the transition from bcon1 to bcon2 scheduled for May 1st, so that would be the earliest that a commit on Blender's side could be made. This assumes OIIO has made an official release by then. I'll comment on the upstream patch as I have further questions about support for different bit-depths, compression settings, and alpha channel processing.

Jonnyawsom3 commented

2024-03-04 09:52:01 +01:00

First-time contributor

The JXL format actually has reserved channels for Alpha, Depth and Thermal (you never know what people will do with Blender :P). On the Jpeg XL Discord server we were also discussing if OIIO would be able to make use of them.

Libjxl's tools (cjxl) automatically detect the bitdepth and encode it accordingly, so it's another case where OIIO might actually be restrictive, but I'll have to read the upstream patch as you mentioned.
Glad to see work is being done though.

The JXL format actually has reserved channels for Alpha, Depth and Thermal (you never know what people will do with Blender :P). On the Jpeg XL Discord server we were also discussing if OIIO would be able to make use of them. Libjxl's tools (cjxl) automatically detect the bitdepth and encode it accordingly, so it's another case where OIIO might actually be restrictive, but I'll have to read the upstream patch as you mentioned. Glad to see work is being done though.

Jesse Yurkovich referenced this pull request

2024-03-09 22:48:59 +01:00

WIP: α channel #119257

This pull request is marked as a work in progress.

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WIP: Add JPEG XL import/export with OpenImageIO #118989

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