Danbooru-based image board with a specialization in high-quality images.
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1) weveletdenoise (threshold; Y 0.0 Cr 1.0 Cb 1.0) to erase color noise
2) greycstoration (-dt 20 -p 0.3 -a 0.5 -alpha 0 -sigma 5.0 -fast true) to turn moire into brush-like texture
3) selective gaussian blur (radius 3 delta 25) to eliminate artifacts around edges
4) greycstoration (-dt 10 -p 0.2 -a 0.6 -alpha 1.0 -sigma 1.0 -fast false) to smoothen the entire image

not bad?
I can't tell without the original to compare. -p 0.2 makes me nervous, though: it usually means "really blurry". Maybe the high -a 0.6 and low -dt 10 counteract it.

By the way, you can apply greyc to just color channels in Photoshop: convert to LAB, apply the filters to the A and B channels, and then convert back to RGB. I think you can do this similarly with the commandline: convert to LAB, save it, and use "-crange 1-2", and then convert it back (but that's a pain).
setting low -dt&-p prevents side effects of greycstoration such as ghost halo effect, and artifacts around edges. I always keep -dt under 20.

comandline greyc can apply only color noise, but slower than weveletdenoise, and the result is same. I can't find advantage of using greycstoration for reduce color noise.
Photoshop greyc doesn't have any halo effect :)

Maybe I'll port that to the commandline version. But you use a different version of greyc, and I don't think source code is available for that...
Right, as far as I can tell there's no source code on that page.
petopeto said:
Photoshop greyc doesn't have any halo effect :)
Lucky photoshop.