[gdal-dev] Updating value for Compression tag for JPEGXL in TIFF to the one of DNG 1.7 ?

[thomas bonfort]

sounds good, +1

thanks,
TB

Le lun. 6 janv. 2025, 18:44, Even Rouault via gdal-dev <
gdal-dev at lists.osgeo.org> a écrit :

> Hi,
>
> Given that communication with Adobe in recent years has been similar to
> expecting to receive a signal from a black hole from outside its event
> horizon, up to now we have unilaterally attributed Compression=50002 to
> mean JPEGXL in TIFF. Recently I saw that the DNG 1.7 specification has
> registered value 52546 to mean JPEGXL in DNG
> (
> https://helpx.adobe.com/content/dam/help/en/photoshop/pdf/DNG_Spec_1_7_0_0.pdf
> , page 122). DNG is a derivative of the TIFF spec, so I guess/hope Adobe
> makes sure that tag & tag value numbers don't collide between base TIFF
> and DNG. So it would seem to me that switching to using the 52546 value
> would be more future proof than our self-assigned 50002. If so, I'd do
> the change in master to using 52546 on write side and accepting both
> 50002 and 52546 on read side, and backport read support for 52546 in 3.10
>
> (this is mostly a GDAL-only topic for now given that the JPEGXL TIFF
> codec is for the internal libtiff copy only)
>
> Thoughts?
>
> Even
>
> --
> http://www.spatialys.com
> My software is free, but my time generally not.
> Butcher of all kinds of standards, open or closed formats. At the end,
> this is just about bytes.
>
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