>>1723730there are a couple of different ways you can go about doing this:
you can either manually select each point on the outline using the bezier (draw) tool. This will allow you to add color to just parts of the whole image, giving you more control over the colors.
the other option would be to auto-trace the entire image with specific settings; this is generally easier and can look better but at the same time you lose control over what gets colored and where.
The webM shows this method as it can be very easy/short (in the option menu the "scans" are the number of colors you want in the image)
Sorry, it's kind of hard to explain over text and im not sure if the webM will really help much, but if you have any other questions feel free to ask me.
