GLSL shader workaround removes grid noise artifacts in Qwen Image 2.1
thevegit0 · reddit · 2026-09-21
A Reddit user noticed Qwen Image 2.1 outputs suffer patterned noise similar to Krea 2 and shared a GLSL "Nyquist Notch" shader workaround: a 7-tap binomial band-stop filter (-1,+6,-15,+20,-15,+6,-1)/64 applied before deconvolution to remove 2px grid artifacts. Just connect the image output to the GLSL node and save; parameters may need tuning but testing is free, full code included.
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