Re: 2 degree vs. 10 degree
Re: 2 degree vs. 10 degree
- Subject: Re: 2 degree vs. 10 degree
- From: Graeme Gill <email@hidden>
- Date: Mon, 10 Feb 2003 15:38:37 +1100
Chris Murphy wrote:
>
I'm talking about the Standard Observer: 2-degree and 10-degree. Not
>
measurement geometry of spectrophotometers. Existing spectros support
>
both, it's just that for ICC stuff we're asking the device to report
>
data based on the 2-degree, not 10-degree Standard Observer. Why?
Because it's standard ? There's some argument that 2 degree is the
right choice for images, where individual elements of an image
are certainly less than 2 degrees of arc.
In practice there's nothing to stop you using whatever lighting and
observer you like, as long as you are running as a closed system.
If you want your profiles to be interchangeable though, you'd
better use the standard PCS.
It would be possible to enhance the ICC spec. to allow for
a different observer model and/or illuminant to be used for the PCS,
but this wouldn't solve the interchangeability problem, it would merely
make sure that profiles with different PCS's weren't used together in error.
To be able to mix and match such things, the ICC profiles would
have to switch to a spectral device model.
Graeme Gill.
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