[gdal-dev] WEBP in GEOTIFF

[Andreas Neumann]

Hi Thomas,

Interesting - thanks for the hint about turbo-jpeg.

I found out that my gdal is linked against libjpeg.so.8 and not against 
libturbojpeg.so.0 which is also present on my system.

Would I have to tell gdal to compile against libturbojpeg with the 
--with-jpeg= flag in order to benefit from turbo-jpeg?

And yes, the mask thing is what I was struggling with JPEG compression 
and RGB images, but I got the mask to work by using the following 
gdal_translate command:

|gdal_translate -b 1 -b 2 -b 3 -b mask -of COG --config 
GDAL_DISABLE_READDIR_ON_OPEN TRUE\ -co COMPRESS=JPEG -co BIGTIFF=YES -co 
NUM_THREADS=4 -a_srs EPSG:2056\ infile.vrt outfile.tif|

Thanks and greetings,

Andreas

Am 09.10.20 um 17:53 schrieb thomas bonfort:
> Andreas,
> The size gains compared to JPEG are marginal, at the cost of 
> noticeably higher compression and decompression times (especially 
> compared to the optimized turbo jpeg library). WEBP does however 
> support an alpha channel which can be desirable, as it avoids having 
> to add a mask IFD to the TIFF.
> Regards,
> Thomas
>
> On Fri, Oct 9, 2020 at 4:30 PM Andreas Neumann <a.neumann at carto.net 
> <mailto:a.neumann at carto.net>> wrote:
>
>     Thanks Thomas,
>
>     Yes, compiling it with libtiff=internal and libgeotiff=internal
>     did the trick - thanks for the hint!
>
>     Do you recommending using webp instead of jpeg inside GTIFF or
>     COG? It seems like the WEBP compression produces smaller file
>     sizes than JPEG, but how does it look speed-wise regarding
>     decompression?
>
>     Thanks,
>
>     Andreas
>
>     On 2020-10-09 15:33, thomas bonfort wrote:
>
>>     You might need to compile with gdal's internal libtiff so that
>>     webp-in-tif support is enabled (i.e. the system libtiff might not
>>     have webp support). Also note you should probably be adding "-co
>>     TILED=YES" to your translate command.
>>
>>     On Fri, Oct 9, 2020 at 3:07 PM Andreas Neumann
>>     <a.neumann at carto.net <mailto:a.neumann at carto.net>> wrote:
>>
>>         Hi,
>>
>>         I am using a self-compiled GDAL 3.1.2 version and try to
>>         create a GTIFF file with COMPRESS=WEBP
>>
>>         libwebp-devel and other webp automatic dependencies are
>>         installed on this ubuntu 18.04 machine. I could also compile
>>         against libwebp
>>
>>         However, when running gdal_translate like
>>
>>         gdal_translate -b 1 -b 2 -b 3 -b mask -of GTIFF -co
>>         COMPRESS=WEBP -co PHOTOMETRIC=YCBCR -co BLOCKXSIZE=512 -co
>>         BLOCKYSIZE=512 -co BIGTIFF=YES -co NUM_THREADS=4 -a_srs
>>         EPSG:2056 -projwin 2599700 1226200 2602200 1224650
>>         ch.swisstopo.orthofoto_2018.rgb.vrt test_webp_ycbcr.tif
>>
>>         I get the following error output:
>>
>>         Input file size is 530000, 480000
>>         Warning 6: 'WEBP' is an unexpected value for COMPRESS
>>         creation option of type string-select.
>>         ERROR 1: Cannot create TIFF file due to missing codec for WEBP.
>>
>>         Any idea what might be missing in my installation - where do
>>         I get this missing codec for WEBP?
>>
>>         Thanks,
>>
>>         Andreas
>>
>>
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>
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