I'm trying to get some pictures simplified to just a few definite and contrasting colors, and am not sure how to go about it. I've searched old topics and have seen this issue come up a few times, but usually with different goals in mind. I found one that looked like just what I needed, but it referred to a plug-in that doesn't seem to be around any more. Many answers referred to the Posterize feature, but... I don't know what that's supposed to do, but it's not workin' for me.
Basically I tell the computer to narrow the image down to however many colors, but it focuses on all the most prevalent ones instead of the most varied ones, giving me several shades of one color and skipping over certain others. Is there a feature or plug-in handy that will allow me to select samples of the colors I want all the shades generalized to?
If this isn't making sense, my goal is to upload it to leftsource.com, click "Print/view your project" and 1) not see a whole mess of intermediate colors on what should be a clean edge between two colors, and 2) not need a dozen different shades of green, brown, red and yellow to do one leaf for example. If you run any image on that site, you'll see what I mean. I just need something that will let me tell the computer how to simplify it.