Quote:
Originally Posted by multiweb
There is but you can't see it. Let's say you have a 16bits camera. The pixel intensity could go from let's say 0 to 65k. If you image something dim you'll get the sky glow at let's say 900, then your signal (faint neb) let's say from 1000 to 3000 then a gap then a few stars up to around 20k then a blank. That's it. So the range of your histogram is from 900 to 20k. Couple of spikes in the middle of the whole range from 0 to 65k. So you need to stretch your data and save it scaled. To do so you make the 900 closer to 0 and the 20k closer to 65k. DDP will do a non linear stretch. Once you're done you save as a TIFF 16bits or other the scaled data and you get your full histogram range in PS. Voila!
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Thanks fella, your a trooper for answering my inane drivel over all this, but again, whats DPP?
you shall have your reward in Heaven
