Lines or dots in an image that are narrower than one pixel or one point will get overrun by the surrounding colors. If the line or dot is black it might be partly visible as a weak grey blur, if it's white or light-colored it will get drowned out. In the original artwork these little monkies have finely textured fur, which just looks like flat gray in the printed image.
For dark lines use a minimum of 1 pixel wide, for white or light lines on a colored area, at least two pixels.
Last update on 2016-03-09 by Ellie Mutchler.