Re: esRGB?
Re: esRGB?
- Subject: Re: esRGB?
- From: Graeme Gill <email@hidden>
- Date: Fri, 23 Jan 2004 22:02:34 +1100
- Organization: Color Technology Solutions Pty. Ltd.
Andrew Rodney wrote:
"Photography - Electronic still picture imaging - Extended sRGB color
encoding - e-sRGB"
http://www.srgb.com/srgb64/pima7667-2001.pdf
Isn't this just srgb64, which has been around a while already ? Its a different
encoding space, not a different colorspace. The primaries and white points
are the same as sRGB, but the range of device values has been extended
to -0.53 .. 1.68, instead of the sRGB 0.0 .. 1.0, thereby extending the
gamut. At its crudest, the idea is you clip the values to be between 0.0 and
1.0, and can then treat it like sRGB.
I guess if someone defined a device representation for applying ICC
profiles, it might be possible to make a profile for it. You'd
have to remap the -0.53 .. 1.68 external range into the
0.0 .. 1.0 range that ICC device values are assumed to have.
The profiles would only be interchangeable if everyone agreed on
the device value mapping. At least one member of the ICC mailed
me a while ago. claiming that such definitions are outside the
scope of the ICC spec., since such device values are device
dependent. It's these sorts of issues that have led to the
situation where various packages disagree on whether monochrome
profiles represent white as 0.0 or 1.0.
Graeme Gill.
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| References: | |
| | >esRGB? (From: Andrew Rodney <email@hidden>) |