Danbooru-based image board with a specialization in high-quality images.

armor crease leina miyazawa_tsutomu queen's_blade topless undressing

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Also needs a bit of cleaning and filtering, but G'MIC keeps crashing on me.
Not only you have this problem with this image me too :] Orginaly this image have 40 MB file size.
greycstoration may work because I filtered many 10000x7000 images with gimp on 1.5GB
Its a question of processor and RAM you have, not the algorithm.
the required ram of g-mic isn't the same to greycstoration.
also greycstoration gui can run with less memory.
if it won't work, then crop left 55% and right 55% then filter.

processor and RAM aren't fundamental issue.