Re: 16 bits = 15 bits in Photoshop?
Re: 16 bits = 15 bits in Photoshop?
- Subject: Re: 16 bits = 15 bits in Photoshop?
- From: Martin Orpen <email@hidden>
- Date: Sun, 17 Apr 2005 23:36:55 +0100
on 17/4/05 22:23, email@hidden at email@hidden
wrote:
> 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 ....
And anybody who worked with RIPs in the 80s and 90s will also agree that
8-bit sucked. Banding in vignettes was a constant problem until kit like the
Harlequin RIPs added the feature of generating additional gray levels during
screening.
We were one of the few shops in London that could output XPress vignettes
without banding until the other vendors added similar features (or the
owners RTFMs...).
However, although it has been a while since I was a member of Colortheory,
I'm glad that Dan has taken his stance against high bit supremacy. High bit
workflows are incredibly time-consuming and expensive if you run a
scanning/retouching/pre-press business.
The benefits are *insignificant* for most pre-press work (scan, optimize,
output) and if Dan wasn't about I'd have every client demanding that we
scan, retouch and store every image in 16-bit.
But, I'm also glad that Bruce takes his stance too! Without high-bit
calculations in PS or in the RIP a lot of 8-bit work would crap too.
For certain projects we will scan in high-bit and I love getting my hands on
RAW data because you can dig so deep into the files.
Only last week week I was working on a bunch of images shot on a
Hasselblad/Phase1 H25. The backgrounds of the 8-bit files quantized every
time we retouched them - the 16-bit versions didn't.
I like to be able to work at whatever bit depth is *right* for the task in
hand :-)
--
Martin Orpen
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