Anonymous ID: 54b5c2 Sept. 17, 2020, 10:15 p.m. No.10691128   🗄️.is 🔗kun   >>1153 >>1259

>>10690981

Holy shit, that's the long route. Here's one Imagemagick incantation:

 

convert input.jpg -scale 5% +noise Poisson -scale 2000% input.jpg -compose Blend -define compose:args=85 -composite output.jpg

Anonymous ID: 54b5c2 Sept. 17, 2020, 10:37 p.m. No.10691263   🗄️.is 🔗kun   >>1308

>>10691191

It's easy to filter out the high frequency component. It's also easy to ignore low frequency components. I think the best approach is to add sharp transitions (ie: big colored blocks) which will add both.