> Thanks Wayne but, do you know if there is the possibility
> of doing this working with stacks?
You can view the channels of an RGB stack using Joachim Walter's
Image5D plugin (
http://rsb.info.nih.gov/ij/plugins/image5d.html). Use
the Plugins>Image5D>RGB to Image5D command to open an RGB stack in
Image5D.
-wayne