Here's what you do: - open image - Layer->New Adjustment Layer->Channel Mixer 1) Tick the "monochrome" selection 2) Adjust the percentages of the various sliders 3) They should total 100% that's your monochrome conversion right there! - Take a black brush and paint onto the areas you want color in - Bring up layers menu (F7 on a PC) and look at the layer stack. At the channel mixer layer you'll see an area to the right that's white. That's the "layer mask" - areas there that are white have the effect applied. Areas that are black have the effect disabled. Areas that are 50% grey have the effect 50% applied... So just paint on the layer mask with black and white and grey! Easy! - For some areas, you can use the selection tool and select whole areas - I traced her panties with the magic selection tool. Then choose the colors so black is the background and hit 'delete' to erase to the black background. You may want to: Select->Feather to blur the edges of the selection area.
That sounds like too much lol. I use Paint Shop Pro and all you have to do is hit hue/saturation/lightness and just pull the saturation out of it. Black n white...Presto hahah
You're right and what I find in the art programs is there is like 20 ways to do the same job. For example the way I would have did the above pic is use a point to point selection with a feather of one and basically selected all the shirt and shorts and make them a layer then just do what I said to the og layer. So its hard to say which methods are better/easier doing task in the art appz. I guess it doesn't matter as long as you know how to get what you want in said app.