U of S | Mailing List Archive | alt-photo-process-l | Re: OT: 16 bit editing myth or reality?

Re: OT: 16 bit editing myth or reality?

From: Ender100@aol.com
Subject: Re: OT: 16 bit editing myth or reality?
Date: Tue, 18 Dec 2007 21:53:32 -0500 (EST)

> Depends on whose eyes—I've also heard 9 bits to be about the
> maximum — and that someone with exceptional vision.

Maybe you read about projected image, CRT or possibly LCD?  If
the image is presented with greater dynamic range, you'll need
more bits to cover the range. Also, you'll have more fine step
discrimination if the image is brighter, like in the case of
slides, especially in dark areas. The dynamic range of prints
is not as wide... and this is especially true of processes
with lower Dmax.

However, in order to fully utilize the 7 to 9 bits of level
resolution at the output, you'll need to edit images at a
significantly higher level resolution, as customarily done by
many people here by selecting 16 bit mode in Photoshop.  How
many extra bits are necessary depends on what manipulation is
given, but 15 bits are enough.

Ryuji Suzuki
"People seldom do what they believe in.  They do what is convenient,
then repent." (Bob Dylan, Brownsville Girl, 1986)