Hi, its correct, the red and blue are switched. The way to fix it in GIMP is the following:
- Open the image which you see in wrong color
- Use Colors → Components → Decompose (this will create a new image, with the 3 channels are layers instead of channels, so you can manipulate those)
- Duplicate the blue layer into a new layer
- select the red layer , select all and copy
- now select the blue layer, and paste the red one you copied, click on the ANCHOR to avoid making a new layer, or it will not work
- now select the duplicate blue and copy its content into the red one
- delete the blue copy layer
- Use Colors → Components → Recompose , this will modify the original image
You cannot change layers, but you need to paste anchor on them. Good luck.