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<p class="MsoNormal"><span style="font-size:11.0pt">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I am attempting to create a COG format GeoTIFF with WEBP_LOSSLESS compression using GDAL.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I have compiled GDAL 3.2.1 from source with libwebp 0.4.2 installed from Debian Buster repos (I’ve also tried with libwebp v1.1.0 installed from source, no difference). When I run the ./configure script before
compiling, WEBP support is listed as “Yes”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">When I try to create a COG with gdal_translate, and setting QUALITY=100, GDAL returns “Warning 6: driver GTiff does not support creation option WEBP_LOSSLESS”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I would expect that WEBP_LOSSLESS would work because the documentation for the GTiff driver states “WEBP_LOSSLESS=True/False: (GDAL >= 2.4.0 and libwebp >= 0.1.4): By default, lossy compression is used. If
set to True, lossless compression will be used.”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Here is the command I am running, it works fine when running with another compression (or choosing QUALITY=99 for WEBP)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">gdal_translate -of COG -co COMPRESS=WEBP -co QUALITY=100 -co NUM_THREADS=ALL_CPUS -co RESAMPLING=NEAREST -co OVERVIEW_RESAMPLING=NEAREST -co WARP_RESAMPLING=NEAREST -co OVERVIEWS=AUTO -co TILING_SCHEME=CUSTOM
-co ZOOM_LEVEL_STRATEGY=UPPER input.tif output.tif <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks for any guidance on getting WEBP_LOSSLESS to work!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Marty Sullivan<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Cornell University<o:p></o:p></span></p>
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