Everything about the reference, the canvas and the guide. Changes here take effect the next time the guide is generated.
Photo
Guide
Physical scale
Takes the canvas shape from the picture instead of fitting the picture inside the paper, so there are no white margins to spend shapes and colours on. The long edge stays as it is.
Prepare
Crops the picture to the canvas edges. Zoom and position still apply.
Simplify with purpose
One value each · every colour mixed on its own
Turns the photo into outlines only, ready to colour in. Lower detail gives big simple shapes for children. Higher detail keeps the structure a painter needs to transfer.
Settings only
Sign in to use Pro presets.
Tries a range of shape counts and palettes on your own picture, and keeps the cheapest that get closest to it. Fewer colours to mix wins any tie, because mixing is the work.