I was trying to photoshop my car flat blue, but I can only get it tolook like pearlescent blue.
This is the pic:

And all the light spots make it look super shiny when the hue is changed. I tried lowering the contrast on it, but it just doesn't want to work.
Suggestions?

 

Make a duplicate layer of the original image.
Have the duplicated layer in front, change the opacity down to about 50%.
Just enough so you can see both layers.
Erase everything in the duplicated layer that you don't want to be flat blue.
If you slip with the eraser, no biggie just use the paint brush and touch it up.

Once you have everything in that layeryou want changed, use the replace color tool.
Image > adjustments > replace color
If you don't like the results of that you could always use the Match color tool.

Typically I just play around with a bunch of different settings until I get a cool effect, or what I was looking for.

Good luck!

 

Well, I know how to recolor the car, but the paint looks pearlescent and I need flat. I don't quite understand how to get it like that, or maybe I'm not understanding your directions?

That's absolutely not what I wanted in that picture.

 

You don't like the streetglo paint?
Oh well. [8D]

It's not the hue that needs to be changed believe it or not.
When you're in the copy layer lower the opacity until you get aprox. where you want the color.
With the copy layer selected (which should be on top of the original layer) go into match color.
Play around which those settings a bit. For a source use the original layer.

 

That description worked much better for me! But I still couldn't get it. I ended up using two 50% opacity layes with the one on top colorized and changed to a blue hue, and both lays with "legacy" and contrast turned way down. Got me this:

A little more cartoonish, like flat color looks in real life.
And orange: