Is it no longer possible to apply shaders to image files opened with the image viewer?
Which version of RetroArch do you have and on what platform?
RetroArch 1.22.2 x64 Linux
Okay, I’ve realized that the current built-in image viewer is not the same as the “core” version. I just compiled it myself, and it works as usual. Thanks anyway.
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I am on Linux too and have v1.22.2, but compiled it from source about a week ago. I do not remember any problem with applying shaders on the image viewer since stable version of 1.22.2.
… Okay, so its resolved while I was typing. Well congratz for finding the issue. 
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