But I have found the conversion's limit. I had thought that if the gauge was small enough, such weird angles and slopes wouldn't be so troublesome and the image wouldn't look like a pixelated Luigi when I was hoping to settle for a pixelated Mario. At the 9st/1" to follow that's obviously bunk.
I've worked this in Assisi Embroidery; stitching only the background.These little birds are from Bibliothèque DMC Point de Croix Nouveaux Dessins, Ire Série c.1905(made available by http://www.antiquepatternlibrary.com/) and when they are cross stitched they are pert, pleasantly squat, and Escher-y.
Knit, they have goiters.
My Mushroom sweater however, is working out. So my new rule shall be Geometric yes, Pictorial no.
EDIT: Go grab some free knitter's graph paper here.