Re: Expanding the proofer gamut
Re: Expanding the proofer gamut
- Subject: Re: Expanding the proofer gamut
- From: Dan Reid <email@hidden>
- Date: Thu, 14 Oct 2004 09:08:53 -0700
on 10/12/04 1:28 PM, Matthew Kelly at email@hidden wrote:
> We have a Roland HiFi FJ500 8 color proofer using pigment inks. For
> paper we are using Roland's PSBP Semi-matte, which is one that Roland
> recommends for proofing. For a RIP, we are using the latest version of
> Colorburst's Prepress RIP, which supports Hexachrome printing. For
> profile building, we are using ProfileMaker 5.01, with multichannel
> capabilities.
>
> What I am trying to do is build a HiFi (Hexachrome) proofer profile to
> use with our CMYK press profile. All of the proofer color outside the
> CMYK gamut, I want to use to expand the color gamut for Pantone colors,
> which I would process through the RIP with Lab values. For the press
> profile I used the ECI2002. For the proofer profile, I am using the MC
> Hexa from ProfileMaker.
>
> The problem I am having is that I keep getting a proofer profile that
> clips the press profile in the red area. I have adjusted the gamma
> settings and ink settings in Colorbusrt, and tried various settings in
> ProfileMaker, but I still can't get that proofer profile large enough.
> I made a profile of the ProfileMaker reference file, and when I compare
> it to the proofer profile, the Deltas are way off.
>
> Do I need to try a different paper? Do I need to switch to dye inks?
> Is there some optimal setting in ProfileMaker? Do I need to change the
> settings on our DPT41? Is my setup unattainable? Is it better to
> suffer the slings and arrows that life is heir to, or to sleep,
> bechance to dream, no more?
>
Since you have PM5, I would build a custom test chart with more patches from
the MC reference chart. The MC charts (I feel) doesn't have enough data
sampling. Also try doing the *proofing* in Photoshop manually and not in
ColorBurst. ColorBurst uses a Kodak CMM which *could* introduce some very
strange things at times. Try that to rule out the Kodak CMM.
--
Dan B. Reid
RENAISSANCE PHOTOGRAPHIC IMAGING
Color Management Products & Training for Print, Internet, & Motion Graphics
http://www.rpimaging.com | Toll Free: (866) RGB-CMYK
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