Hi--having some problems classifying Landsat 8 imagery that I've never had before. I have an layer stack of 4-bands, and simply trying to do the usual ROI routine (ROIs contain anywhere from 70 to 700 pixels). I keep getting all black images. I checked the rule images, and they're all negative. I think someone may have posted a similar problem a year or two ago, but didn't see an answer. Any idea what I'm doing wrong here? Never had an issue before. I have NOT yet run FLAASH corrections--I suppose I need to but this has never caused an issue before. Unfortunately I'm stuck on ENVI classic--we're still at 4.5 since there's no money at our institution to upgrade. Any help would be appreciated!