Sorry guys I don't think I explained myself very well.
I have a wood texture that I am using for the side of a house. The original colour of this texture is whitish. The colour of the house is green. I used the eyedropper tool in sketchup materials/edit to grab a colour overlay that converted the whitish texture colour to green. This looks great. The problem only occurs when it comes to exporting whereby the Collado file of the texture does not realise that its supposed to look green. I tried to get around this by using the "make unique texture" but as soon as I do I end up with an area in the original texture colour.
I am pretty good on photoshop but if I try and colourise the original texture I loose too much of the detail and it looks naff.
Any cunning ideas?