Guides and articles
Longer pieces on getting good results: which images convert cleanly, what the settings actually do, and how to print a page that looks the way it did on screen.
Which Images Make Good Coloring Pages
Edge detection rewards some pictures and punishes others. Here is what separates an image that converts cleanly from one that turns into visual static.
Why Most Coloring Page Tools Upload Your Photos
Converting an image to line art is cheap arithmetic a browser can do instantly. So why do nearly all online tools send your picture to a server first?