Hi guys, i found some similar topic, which was solved by a programming code. But what i need to know is way more simple (and honestly i have done it before) but somehow its not working out right now. So i have a landsat HDR file with two bands (they show separate in the "available band list" when i unfold the .hdr file) But for some landsat gap fill methods, i need them to stand alone, how can i extract a single band into a new file?? big thanks in advance for the solution of this (for u guys obvious) problem cheers kchien