Not too sure, myself, but if you want to just change a specific area, two things.... first, are you in RGB mode, or CMYK?.... next, one thing you can do is to lasso-select the area first, then have a go at expanding the percentage.... how "picky' it should be, and see if that helps... the reason I ask about the colour mode you're in is, if you aren't, some of the colours automatically default to grey. lou.

"..... and that was when things got interestiing."