Partly solved!
> I don't know how to select by color, but only within a certain area of the
image.
Select the "certain area of the image" first.
Then Select by Color, but change the Mode to "Intersects"
Then click on the color you want to select.
Still need to take those selected areas/colors
I have a landscape photo filled with trees. Through the trees you can see
dozens of sky and cloud spots in the background. I'd like to select the blue
sky areas (a fairly large range of blues), and shade them all a little darker
toward one of the bluer sky colors in the image.
I'm comfortable
