Excellent work. What if you leave the Green channel empty or mapped to the Ha? If you're viewing Alberts stacks, you can use the "Older" and "Newer" buttons at the top of the page to flip through the images to see the progression. Tim On Feb 1, 2013, at 12:50 PM, Albert Barr <ajbarr@xxxxxx> wrote: > > Here's a link to the Seagull in BiColor. Ha=Red, OIII=Blue and OIII mapped to > green (creating and artificial green) > > http://www.flickr.com/photos/49526053@N04/8436415116/in/photostream/lightbox/