Re: TIFF RGB in PS6 as Working Space.
Re: TIFF RGB in PS6 as Working Space.
- Subject: Re: TIFF RGB in PS6 as Working Space.
- From: eric ryan <email@hidden>
- Date: Fri, 3 Nov 2000 11:06:43 -0700
Bruce J. Lindbloom wrote:
"IMHO, RGB reference spaces should be D65, not D50 and should have a gamma of
2.2, not 1.8. A 2.2 gamma is a much better representation of a uniform
perceptual scale than is gamma 1.8."
Point taken. (Although I thought D50 1.8 was "the industry" standard...)
Bruce continued: "EricRGB does not contain the gamut of colors of
photographic papers (in the
magentas and yellows) if that is important to anyone."
This is not important to me because Lab does contain these colors and so do
the scanner calibrations on the s3400. Therefore, my raw 16-bit Lab scans
will contain a great number of colors, and they will be approprately
reduced from Lab to save in an 8-bit intermeadate space.
So now i have developed my second RGB archiving space--granted it is only a
sketch. I've titled it EP_RGB.icc. (That's for Electric Page) It is D65,
gamma 2.2, primaries: Red 0.67x 0.33y, Green 0.21x 0.70y, Blue 0.16x 0.09y.
EP_RGB does not clip any of the cyans (or any other color) out of any CMYK
printing press space that i have encontered--unlike TIFF RGB.
EP_RGB also contains a medium sized gammut specificly intended for
archiving CMYK scans in RGB for multipurposing--unlike Ectaspace which is
large gammut containing all colors found in Ectacrome film. (or for that
matter 8-bit Lab)
So here's the link:
http://www.electricpage.com/staff/EP_RGB.icc.sea
Tell me what you think.
Sincerely,
Eric Ryan
Scanning Technician
The Electric Page