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Image Trace had no way to trace some of an image's colors and leave the rest out. Ignore Color drops one color, so tracing only the line work of a multi-color image took a full trace and then deleting the other colors' paths by hand. With "keepColors": ["#rrggbb", ...] in the params of imageTrace.make and imageTrace.makeAndExpand, only the palette colors within about 30 levels of a listed color are traced, the distance Ignore Color matches by. With Method Abutting, the kept colors' paths are the same as in a trace of every color. With Method Overlapping, a kept color's paths do not reach under the colors left out, as with Ignore Color. An empty list traces every color, and a value that is not a six-digit hex color is refused. Flat Logo mode does not use the list. The reply's warnings name each listed color that matches none of the colors the trace found, and say when nothing was traced; the status bar shows the first. The warnings are translated in every complete catalog. The params help of imageTrace.make lists keepColors and the new warnings, and the help of imageTrace.makeAndExpand lists the warnings it returns.