Do you have any idea why the differences exist? Is it worth investigating?
Quite likely subtle differences in behavior of the JPEG compression library. Mine on ubuntu 20.04 is libjpeg-turbo 2.0.3 with IJG libjpeg 8 ABI. I presume if you built if from source and linked it against GDAL, you'd get the same checksums.
We should try to minimize tests using JPEG for that reason, but in that instance, this test is really meant to check JPEG specific code paths in the COG driver. Or use some kind of perceptualdiff test for such test, but the "perceptualdiff" utility does consider "your" and "mine" image to be different, so that wouldn't help. We'd probably need something clever that tolerates pixel values differences that can be quite important (the max here is a difference of 19 units) but detects there's no spatial shift.
On Wed, Apr 28, 2021 at 8:35 AM Even Rouault <even.roua...@spatialys.com <mailto:even.roua...@spatialys.com>> wrote:Andew, visually the difference between your image and the one generated on my PC are almost indistinguishable (no spatial shift at least). Please submit a PR adding your checksums as alternate accepted ones. You may just remove the "if sys.platform == 'darwin'" case. Hopefully adding your checksums should fix the OSX CI too -- Andrew Bell andrew.bell...@gmail.com <mailto:andrew.bell...@gmail.com>
-- http://www.spatialys.com My software is free, but my time generally not.
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