Photoshop Conundrum, Rarely use it but replace color option seems to misbehave Options

[yarik83]

Hey all.

I rarely use photoshop but when I do its mostly to touch up photos (ie change skin color or deciding on house paint)... for some reason same exact option does not work when I try to change color of a car. It selects pixels and changes color but it does not change color globally. Adding more colors to selection starts changing colors elsewhere and even with max settings car itself looks like a broken plasma tv picture with a whole rainbow of colors. All I am trying to do is taking my old black car and changing color to tan brown color and changing a yellow dragon that I used to have and change that to white. Dragon comes out alright but black to brown conversion comes out looking rather iffy.

Is there a workaround to this? For time being I am able to use stamp tool and magic wand tool to make a really crappy looking photo but at least with last colors.

Thanks for your help