Mypaint was probably the first software to implement spectral blending, way before even Mixbox, this thread was originally opened to implement the same functionality in krita, thank you very much indeed, without your spectral.js it would probably have taken a long time to implement spectral blending in krita, yes, you can download the full source code using this link: https://invent.kde.org/killy/krita/-/archive/spectral_blending_mod/krita-spectral_blending_mod.zip