Your problem is you think color grabber = accurate. Sure it's accurate -- for that pixel. You need to expand your thinking a little and realize that textures are not one flat color. They have shadows and hilights (and often times the shadows and hilights have hints of other colors in them -- shadows are often more blue while hilights are often pinker, even if just subtly).
And for the records, "blue twi'lek != Mission Vao" is not spam -- it is an accurate representation of the truth. I advise you to listen to the advice of modders who have several times more experience than yourself, otherwise I think you'll find in the future that we'll be unwilling to help you when (you think) you actually need it.