ArcGIS Pro and related products like ArcGIS Server include the ability to perform image manipulations with Python code using the Pillow library. Starting with Pro 2.7, Pillow-SIMD was included, an API compatible fork of Pillow with improved performance. However, that fork hasn't received the same level of updates as the underlying Pillow package, and starting at Pro 2.9, we began shipping the baseline Pillow library. For customers who are on Pro 2.7 or 2.8, there had been a non-working build of Pillow-SIMD available on the Esri channel, pillow-simd-8.2.0-py37_1.tar.bz2 which was reliant on versions of packages not otherwise available through conda. Because this package could be inadvertently upgraded to, it has been removed from the channel to prevent its use. We recommend using the included Pillow library shipped with Pro 2.9 and later, and if you need the performance of Pillow-SIMD, you can get the latest build via pip locally.
If you have an environment with the broken pillow-SIMD 8.1.2 in Pro 2.7 or 2.8, you can remove it by running:
conda install pillow-simd=7.1.2
For Pro 2.9 and later, you can continue to use the updated pillow package we ship, or if you require high performance image manipulation, in a custom environment, install it with:
pip install pillow-SIMD
