Quote:
Originally Posted by multiweb
That's the only step I'm not clear with. How do you do that?  |
That's the trick of course, but if it's really even across the whole image you could just use a dropper and sample a pixel (or bunch of pixels) that you're absolutely certain of that they represent background pixels (e.g. pixels that should become completely neutral black once the model has been subtracted). Then use the RGB value that you found with the dropper and fill the whole layer with that RGB value. It's quick & dirty but could work reasonably well.
For the more serious work there is ofcourse GradientXTerminator (PS), DBE/ABE (PixInsight), Wipe (StarTools), etc. that either remove light pollution or can create a model for you.