Re-colour a simple button

[phykell]

Simple one I guess, but how do I recolour a basic image?

I have a red button and I want to recolour it blue using something like Paint Shop Pro:

http://homepage.ntlworld.com/phykell/redbutton.jpg

If there was only one colour in the image it would be easy, I'd just repaint it with a blue colour but there are various shades of red on this button. Ideally, for each pixel I'd like to swap the red and blue values. Programatically I could get each .bmp RGB value and swap them for each pixel but there must be an easier way surely?

Pixel 1: 233, 0, 4 ---------> 4, 0, 233
Pixel 2: 243, 0, 2 ---------> 2, 0, 243
Pixel 3: 253, 0, 0 ---------> 0, 0, 253

 

[phykell]

cant remember psp off hand but in photoshop could either use the colour replace tool or just up the blue in the colour balance

Upping the colour balance won't work as there is no blue whatsoever in the image. I tried the colour replace but it left some of the pixels around the "hole" with their reddish colouring. Of course I could colour replace each pixel but there are a lot of pixels and it seems an awful lot of work.

or change the hue

Changing the hue doesn't work either. All I want to do is swap the colour values between the red and blue channels for every pixel.

The easiest thing to do of course is to just fill the hole in and recolour the whole button with a solid colour but there must be a way of doing what I want to do surely?

 

[phykell]

That's it, on PSP 9 it's "Adjust/Hue and Saturation/Colorize".

Thanks for the help everyone, the option above must have been the only one I hadn't tried To be honest though, it doesn't give you much control. You don't get to pick the most prevalent colour in the image so you have to do it by eye. I really needed to use the dropper tool to set the main colour to a specific one but hey, it's easier to set the background to suit the button!

I'll have to get a bit more aquainted with PSP, but remember the first paint package I really used was NeoPaint on the Amiga!