Re: 16-bit vs 8-bit output profiles
Re: 16-bit vs 8-bit output profiles
- Subject: Re: 16-bit vs 8-bit output profiles
- From: "Harold Boll" <email@hidden>
- Date: Thu, 6 Apr 2006 06:36:24 -0700
- Thread-topic: 16-bit vs 8-bit output profiles
Mike Eddington wrote: (Thu, 6 Apr 2006)
> ... what is the gamt tag indicating when it shows an
> 8-bit PCS to gamut check table vs a 16-bit PCS to
> gamut check table.
> ....
> ... but what's up with that tag anyway?
Good question and the short answer is not much. It was originally
included as part of the ICC spec as a way of determining whether a given
color was in or out of gamut. I suspect if the ICC spec were being drawn
up today, this tag would not be included. The transform returns a 0 if
the color is in gamut, while a value greater than 0 represents an out of
gamut color. Turns out that a 3-D CLUT table is really not a good way of
representing in/out gamut data; these tables are really quite inaccurate
for making precise gamut boundary determinations. Monaco has made a
smart choice by always making this transform an 8-bit number; no sense
in carrying around extra bits for numbers that may be grossly off the
mark anyway.
Harold Boll | 1.978.439.7096 | email@hidden |
http://graphics.kodak.com
" The sunlights differ, but there is only one darkness. " Ursula K.
Leguin
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