> I have a logo that I'd like to swap the colors in. The words are blue and the
> background is white. I'd like to make the words white and the background blue.
> How can it with this .png file?

It depends on whether the words are dithered or not.  If there are sharp edges
and the image really only has two colors, try the following:

Click on the eyedropper (or O (O not 0), then click on the words to make the 
color of the words the foreground color.

Click on the color tool (or <shift>O), then click on the words to select all 
of the color in the words.  Don't use the magic wand, as it only selects colors 
which are contiguous.

Invert the selection (Select/Invert or <ctrl>I).

Click on the Bucket Fill tool (or <shift>B).
Look in the tool options to make sure the fill type is "FG color fill".

Click on the background area to turn it the color of the letters.  
The whole image should now be the same color.

Invert the selection again.

Click in the tool options to change the fill type to "BG color fill".
Click on the words to turn them the background color.

If the words are dithered it's more difficult as you need to change all the 
"in-between" colors to an appropriate "in-between" color.

If you need that let us know and we can go into more detail for that.

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