RE: Repurposing HSV on SGIs
RE: Repurposing HSV on SGIs
- Subject: RE: Repurposing HSV on SGIs
- From: Jeff Harmon <email@hidden>
- Date: Wed, 07 Feb 2001 11:57:14 -0800
Thanks Henrik and Chris for your clear ideas here on my SGI conundrum. Yes,
I agree that if it's using unadulterated monitor RGB, I can make a monitor
profile using OptiCal as source, and the printer profile to separate. I'll
look more into it with SGI and Lectra.
Question for Henrik:
>
Hmmm...if you know what it's supposed to look like on the color
>
printer, then use the color printer profile as the source and convert
>
backwards to CIELab (or beyond that to an RGB working space) with
>
relative colorimetric in order to produce digital originals. If this
>
looks OK in Pshop 6 / AI 9 / InDesign 1.5 then that's a simple way to
>
go.
These files are currently sent in RGB (with HSV designations) and are
separated in-RIP blindly, with no specifically defined input or output
profiles/spaces. So the files I'll be getting exported to me will be
basically untagged RGB. So I can't use the printer profile as source and go
back to LAB, unless I'm missing something.
They currently output to an Iris, and will be outputting to Epsons, both of
which, I believe look for RGB input, and would be profiled as "RGB"
printers. But I don't think that defines their origin on the workstations,
just their destination, right?
>
Another way of doing it is chancing a guess that the SGI application
>
uses standard OS level monitor phosphors for an internal RGB working
>
space which for ease of use it presents as HSV. Then from there you
>
can reconstruct the working space from SGI specs (assuming SGI only
>
delivers one type of monitor which is somewhat unlikely) and build it
>
as an ICC profile in Pshop 6.
>
>
Lastly, if I remember rightly there's a version of Optical that works
>
for SGI Irix. I wonder whether the Color Partnership folks might not
>
have some ideas based on their experience.
I'l find out for sure, but it's a good guess that monitor RGB is the deal
here, and OptiCal will be my answer to define it. Thanks again.
----------------------------
j e f f h a r m o n
director
colorhythm
1526 woolsey street
berkeley ca 94703
510.647.3689
email@hidden
http://www.colorhythm.com
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