Reply To: Blender 2.91 Official Release is here!
Images added as “Reference Image” or “Background Image” can be traced with “Grease Pencil Strokes”, but only with one color (black per default):
If you want it with the colors preserved, you should trace it with Inkscape (freeware!) and import the saved “.svg” file into Blender as described here (scroll down a little bit to the post hightlighted with an orange frame) and extrude the separate curve paths with different thickness values (curves set to “2D” in order to get a filling):
