Yes that place, you can find some very technical articles there. Something else I forgot to mention, is the black point. The black of RAW is not defined as zero because your noise statistics would be lopsided. So the level is set at say 1000 and noise averages to this 1000 which is defined as black. Without less than 1000 values pulling down the average, a stacking would just end up bringing the black to a grey. If that makes sense.So this point is set to contain all possible noise variation. It is estimated from the extra non-imaging pixels on the border of the CCD. So your resolution is reduced, say 1000-4096 or you lose .25 bits from that. I'm not fully satisfied this explains losing 2 bits though.Here's the technical article I saw:Signal to Noise: Understanding it, Measuring it, and Improving itPart 3 - Measuring your Camerahttp://www.cloudynights.com/item.php?item_id=2001
I thought someone would mention that But according to this reference, for cameras other than Canon it can 100-1000:
Quote from: KenO on 03 / August / 2012, 12:40:10Was there a posting for "ewavrs measurements" that discussed what are considered "Good & Bad" measurements for 12 bit cameras? I don't really understand what there is to discuss. ewavr just made a histogram of the raw values, and saw that even though the raw is 12 bit, there are only ~1000 distinct values (equivalent to a 10 bits) As I said before, this observation was made for one camera, what other cameras do is unknown until someone cares enough to measure them.
Was there a posting for "ewavrs measurements" that discussed what are considered "Good & Bad" measurements for 12 bit cameras?
In researching info on the "active area" of the sensor, I discovered that it is located on the right side of the sensor, not in the middle.
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