Flat-colour art. PNG preferred. Fuzzy JPEG? It'll cope.
Draw yr thing. Keep the lines and edges as crispy sharp as you can. Save it as a PNG (other file types later).
Upload yr shit. The machine counts the colours itself and shows you the inks it found. Disagree with it? Hit PICK MANUALLY and choose up to 10 yourself.
Scanned jpeg or fuzzy file? It notices and cleans up after itself. White paper baked into the file? Tick DROP WHITE BACKGROUND. Two colours annoyingly close (dark brown vs black, i'm looking at you)? Hit SHARP.
Hit MAKE. The matrix does all the fiddly matching weird pixel shit. Download the layers one at a time or all at once as a zip.
Soon the zip also comes with a swatch sheet, every colour plus its closest Pantone (coated) guesstimate, so you can eyedrop straight off it. Gonna sort that soon
Layers come out the same pixel size as the file you uploaded, so upload at the size you want to print. They're flat 1-bit so they stay crispy.
Open the seps on the original sized canvas, kick out all the white (or set the layers to multiply), fill them with the swatch colours, boom, done.
And yeah my old way of trapping colour for sloppy printers is in there as an algorithm, so every lighter colour sneaks about 2 pixels under the darker one next to it. Yr print is safe from shit registration. Fucking neo ta fuck boys.