Re: 16 bits = 15 bits in Photoshop?
Re: 16 bits = 15 bits in Photoshop?
- Subject: Re: 16 bits = 15 bits in Photoshop?
- From: email@hidden
- Date: Sun, 17 Apr 2005 17:23:52 -0400
I'm a photographer and have noticed over many years that gradients have
issues in 8 bit and not in 16bit,
Some time ago I photographed and did digital manipulation on a
Tanqueray gin ad campaign and the halo on green always had banding
issues on LVT output and in 4color reproduction. Then I started using
an application, called LivePicture. It uses 16bits internally. The
banding problem disappeared. I used this application to generate subtle
gradients for a Shiseido ad campaign and had no banding problems. I now
routinely have no banding problems in photos with skies and gradients
that were photographed, scanned, captured digitally or generated as
long as i use LivePicture or Photoshop in 16bit.
An artist I work closely with does huge ink-jet prints and they have
skies with subtle gradients. Banding was an issue till the manipulation
was done in 16bit. This artist now sends 16bit files to ImagePrint Rip
on a 9600 and on the prints there is no banding that was previously
very present and a problem using 8bit files.
Images that have a lot of detail or noise and grain may not show the
difference between 16bits and 8bits, but will not stand up to close
inspection. 4/c reproduction for the most part sucks and 8bits is
probably enough, but when I work on images I see a distinct difference,
especially on images that have a very high tonal range. 4color
reproduction is not the only destination for images.
Unfortunately since i work in the real, practical world I have not kept
any examples of 8bits falling short, but i can attest to it and testify
under oath that as an expert professional photographer and image
manipulator since PS 1.0 I have much experience with 8bits falling
short, where 16bits have made a real difference. 15bits too ....
Ulf Skogsbergh
On Saturday, April 16, 2005, at 01:28 PM, email@hidden wrote:
If you are inserting your own computer-generated gradient then 16-bit
can be
helpful. If you are speaking of an existing photographic gradient,
this has
been tested fairly extensively and nobody has been able to demonstrate
any
advantage to manipulating it in 16-bit. As to realizing that you
should have
started in 16-bit, again, no one has ever been able to demonstrate
(unless you have,
which I take it you have not) that there's any advantage to doing so
with a
natural color photograph under any real-world circumstances,
regardless of how
severe the later edits are.
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