[gdal-dev] [EXTERNAL] Re: GeoTiff JXL sample format & bits per sample restrictions?

[thomas bonfort]

doc update PR in https://github.com/OSGeo/gdal/pull/9220

On Fri, Feb 9, 2024 at 3:38 PM Meyer, Jesse R. (GSFC-618.0)[SCIENCE SYSTEMS
AND APPLICATIONS INC] <jesse.r.meyer at nasa.gov> wrote:

> We can work with the Uint16 case.  These dtype limitations should be
> listed on the gtiff docs presumably.
>
>
>
> *From: *thomas bonfort <thomas.bonfort at gmail.com>
> *Date: *Friday, February 9, 2024 at 9:37 AM
> *To: *"Meyer, Jesse R. (GSFC-618.0)[SCIENCE SYSTEMS AND APPLICATIONS
> INC]" <jesse.r.meyer at nasa.gov>
> *Cc: *"gdal-dev at lists.osgeo.org" <gdal-dev at lists.osgeo.org>
> *Subject: *[EXTERNAL] Re: [gdal-dev] GeoTiff JXL sample format & bits per
> sample restrictions?
>
>
>
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>
>
> JXL in tiff should support the 2 band case correctly. What is not
> supported here is the int16 datatype. Only uint8, uint16 and float32 are
> supported.
>
>
>
> TB
>
>
>
> On Fri, Feb 9, 2024 at 3:32 PM Meyer, Jesse R. (GSFC-618.0)[SCIENCE
> SYSTEMS AND APPLICATIONS INC] via gdal-dev <gdal-dev at lists.osgeo.org>
> wrote:
>
> We are trying to convert a 2 band int16 ZSTD compressed geotiff to JXL
> compression.  However for each band the following error message is given
> “ERROR 1: GetJXLDataType:Unsupported combination of SampleFormat and
> BitsPerSample”.
>
>
>
> On GDAL 3.8.3, released 2024/01/04.  JXL v0.9.2
>
>
>
> gdal_translate -ot int16 -co "COMPRESS=JXL" -co "NUM_THREADS=8" -co
> "TILED=YES" -co "SPARSE_OK=YES" -
>
> co "INTERLEAVE=BAND" -co "JXL_LOSSLESS=YES" in.tif out_JXL.tif
>
>
>
> The docs state an encode limitation for GDAL < 3.6 wrt interleave and band
> counts.  We’re not subject to that, unless there’s a bug, but I do wonder
> if we have nonetheless gone off the support path with band interleave with
> 2 bands?
>
>
>
> Jesse
>
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