Reducing colors in photoshop? (making many colours fewer)

[bombhills]

Hi! I've been working on some pictures that will be printed on T-shirts. The problem is that I've got alot of different color in the pictures which would result in a very expensive print. What I would want to be able to do is to reduce the colors in the pictures to only 4 specific colors (plus black and white). The colors must be very specific. for an example: "ff2600".

To be totally clear: I need the ALL the different types of yellow into be transformed to just one type of yellow.

So my question is am I able to do something like this in photoshop?

I'd be very grateful for some answers!

Thank you!
// Hannes

 

[chefranden]

Try using either a posterize adjustment layer, or the cutout in the artist filters.

cutout is more adjustable.

 

[chefranden]

If you have access to a copy of Corel Painter, you can try the woodblock effect. With it you can specify the exact number of colors and even choose which ones they will be.

 

[bombhills]

If you have access to a copy of Corel Painter, you can try the woodblock effect. With it you can specify the exact number of colors and even choose which ones they will be.

Oh, sounds nice! Where can I get that thing? (is it a program?)