Gaps in histogram will certainly exist if you apply curve or level to a 8
bit image. In most cases even a clear sky contain random dots of
slightly difference levels, it is not easy to get banding look. I had some
16bit scans of underexposed negative with lots of gaps (some rather wide
one) on the shadow areas, I tried very hard to look for posterization but
never able to find some.
To do multiple editing on a 8 bit image, I will change it to 16 bit first,
it make sure multi-steps will only have single effect on the level
distribution.
C.H.Ling
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
I have created it myself at least once (but years ago) by pushing a JPEG
too hard. I have also seen gaps in the histogram that aren't necessarily
apparent in the image. Probably a warning of impending posterization.
Chuck Norcutt
On 8/4/2014 11:29 PM, C.H.Ling wrote:
I have also seen some here and also pointed it out but not my own images.
C.H.Ling
----- Original Message ----- From: "Chuck Norcutt"
<chucknorcutt@xxxxxxxxxxxxxxxx>
I have definitely seen posterization.
Chuck Norcutt
On 8/4/2014 7:52 PM, C.H.Ling wrote:
I always use 16bit for editing but I have to admit that I never seen
any
banding or posterization when editing my 8bit camera JPEG.
C.H.Ling
----- Original Message ----- From: "Ken Norton" <ken@xxxxxxxxxxx>
I did, I did. I wasn’t reading carefully enough . . .
You missed the tongue-in-cheek. He did indeed carry out a lot of
dodging and burning... AKA post-processing.
Post-processing is NOT the same as raw conversion vs JPEG. If a person
is doing serious bit-bending, then yes, it does make sense to start
out with as many bits as possible. But let's be honest with ourselves
and admit that rarely do we ever bend them enough to make them squeal
in pain.
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