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Data extraction of some samples in n-bit files #202

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constantinius opened this issue Feb 26, 2021 · 2 comments
Open

Data extraction of some samples in n-bit files #202

constantinius opened this issue Feb 26, 2021 · 2 comments

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@constantinius
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When reading not multiple of 8 bit unsigned data in pixel interleaved images, some samples are read wrongly.

Bildschirmfoto 2021-02-26 um 12 15 46
@ashley-mort
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ashley-mort commented Dec 16, 2022 •
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I'm seeing something similar. readRasters on an 11-bit TIF sometimes gives me values above the top pixel value of 2047. ~1% of my pixels will be from 2048-2121.
Any tips on where to look to try to address this?

Note: When it happens, it's only on the reduced resolution (internal) overviews. When I zoom in to full resolution, the problem is not there.
Image was created by GDAL 3.4.3 gdal_translate -of COG -co COMPRESS=DEFLATE -co NUM_THREADS=ALL_CPUS -co BIGTIFF=YES

geotiff.js 1.0.0-beta.14

@ashley-mort
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Adding this to my gdal_translate fixed my issue. Sorry for the false alarm.
-co OVERVIEW_RESAMPLING=AVERAGE

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@constantinius @ashley-mort