Re: Profoto
Re: Profoto
- Subject: Re: Profoto
- From: Jon Meyer <email@hidden>
- Date: Fri, 30 Nov 2001 12:27:35 -0500
I did a quick test and found that 255,0,255 (Magenta) separated to
US Web Coated (SWOP) v2 in Photoshop 6 using the Apple CMM and
Saturation Intent to:
Kodak ProPhotoRGB = 17, 95, 0, 0
Adobe RGB = 15, 84, 0, 0
0, 255, 255 comparison (Cyan)
Kodak ProPhotoRGB = 100, 0, 34, 0
Adobe RGB = 91, 0, 25, 0
Kodak separated yellow perfectly to 0, 0, 100, 0
Adobe added 9% cyan
Red 255,0,0
Kodak ProPhotoRGB = 0,100,85, 0
Adobe RGB = 0, 99, 98, 0
Green
Kodak ProPhotoRGB = 87, 0 , 100, 0
Adobe RGB = 100, 0, 100, 0
Blue
Kodak ProPhotoRGB = 100, 82, 10, 2
Adobe RGB = 89, 78, 0, 0
I then did a quick test and found that Adobe RGB lost 6% to 10% of
the primary when using the perceptual intent.
i.e. Magenta dropped from 84% to 78%; Cyan dropped from 93% to 82%.
Kodak differences were smaller: 91% Magenta (vs 95) and less yellow
contaminant in Cyan (which remained 100%)
Given: Theoretical CMY are not equal to process CMY
Conclusion: All working spaces have issues. Being simple matrices,
they could be improved with LUTs (now supported in Photoshop 6).
Question: Who wants to take on the challenge?
- Jon Meyer
At 9:41 AM -0500 11/30/01, Jamie Quaile wrote:
>
What difference would I get from converting to cmyk from a Profoto rgb space
>
rather than lets say from a smaller Adobe rgb space. cmyk is to be standard
>
US SWOP.
--
*******************************************************
Jon Meyer
GrafixGear
email@hidden
http://www.GrafixGear.com
8 West Glen Avenue
Ridgewood, NJ 07450
USA
(201) 447-1510 voice
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| References: | |
| | >Profoto (From: Jamie Quaile <email@hidden>) |