How to create a wide plain image with 3 seperate colors in it

Hello, couldn't think how else to title the thread, basically i need to create (in photoshop) or in anything that can do this, a 950px wide 10px height image that will have 3 colors, like the following.

white550px|color200px|color200px

All just one image, i have no idea how i add the color at the neccessay point within the image to get that, any advice please?

The height is not important, it can be 1px, 5 px etc, its basically how to drop the 3 colors in so they are positioned, that i need to know how to do.

 

In photoshop ,

Press U on keyboard to select shapes and choose rectangle to draw. Just draw three rectangles with different colors and position rectangles as you wish

Hope this helps

 

Or you can work with layers;
background layer white
layer 1 = color 1
layer 2 = color 2
then move your layers in position, flatten image and save

 

Thanks Digital_Designer and 50plus, il try both of these methods, il let you know if i succeed with it, i know its probably ultra simple, il have a go.