Re: RGB Color Space Info Request
Re: RGB Color Space Info Request
- Subject: Re: RGB Color Space Info Request
- From: Neil Barstow <email@hidden>
- Date: Sun, 24 Nov 2002 19:10:38 +0000
Hi Andrew
On 23/11/02 at , Andrew Rodney <email@hidden> wrote:
>
I've scanned from a fairly wide gamut scanner (a FlexTight 848 using a
>
custom profile made by the wonderful HCT Target) directly into several
>
working spaces (sRGB, Adobe RGB and Wide Gamut RGB) then output to a fairly
>
wide gamut device (A Fuji PG3500). On examination under a D50 lightbox, I
>
could hardly see any difference at all. The 4x5 was the "famous" Yarn image
>
that Kodak provided in the old days. IOW, a pretty saturated original. The
>
differences on output were pretty mild giving me the impression that this
>
entire Working Space debate is somewhat overblown. YES you do see
>
significant differences when you plot the gamuts. But when ink hits paper
>
(in this case when a laser exposes a silver media), the differences in the
>
Working Spaces is pretty trivial.
my 2c
Speaking from a photographer's standpoint I think the preservation of
the detail and tonal info from an original is paramount [as well as the
colour of course].
What concerns me in this scenario -
when the savage [no gamut mapping] move from scanner space > RGB WS
clips actual image data [yes, it's rare we get such strong colours in
nature - but look at those strong yellows on the Fuji Lanovia test
transp' for example].
By that, I mean that the areas of high gamut colour [inside scanner
<space> but outside the WS] - which previously contained tonal
differentiation are now clipped to the same value, I've see it in
backlit leaves. If the WS is too small [as ARGB often is from a wide
gamut scanner (if I may call it that)] this tonal info is now gone -
whatever the output device. If that tonal separation had been
preserved, it could have been used in printing - with careful
targetting and the infinitely more sensitive conversion we get when
going WS > Output space.
I agree it's rare to see the difference in prints - but why not hald
all the data unclipped 'til output since we can??
Regards
NeilB
- - - - Consulting in Imaging & Colour Management - - - -
custom scanner and printer profiles, training on Trident & Imacon Scanning
- - - - - we supply Gretag and eyeOne, also XRite & OptiCal - - - - - -
p:44 (0)1273 774704 m:44 (0)7778 160201
http://www.neilbarstow.co.uk/
http://www.apple.com/uk/creative/neilbarstow/
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