Quoting Nandakumar KS :

Hi,

In the image am having, I want to swap the colors between red and blue. How to do that using gimp???

I would recommend using the Colors Channel Mixer. If you look at the screenshot for it in the online GIMP User's Manual (http://docs.gimp.org/en/plug-in-colors-channel-mixer.html), you will notice it showing the Output Channel chosen being Red and that it is configured to 100% Red with 0% for the Green and Blue components (this is what you would expect for the Red Channel to appear as Red :] ). If you change the slider values so that the Red Channel is set to 0% and the Blue Channel is at 100%, then the information in the Red Channel of your layer will be converted to Blue (you are halfway done).

Now if click on the drop-down box for the Output Channel and select the Blue channel, you can change the settings for it so that the Red Channel is 100% and the Blue Channel is 0%.

Once those two changes are made, you can click on the "OK" button. The Red & Blue channels will be swapped (this only happens on the selected region of the active layer, to have the change affect the whole image, you will need to merge your layers or apply the same settings to the other layers manually).

Nandakumar KS wrote:

In the image am having, I want to swap the colors between red and blue. How to do that using gimp???

can anyone plz guide me in this regard?

Of course.

1. Open the image. 2. Apply the "Color Exchange" filter and swap any two colours you want. You can find this filter under the Filters->Colors->Map->Color Exchange.

Harish