Re: Media Testing for maclife.de
Re: Media Testing for maclife.de
- Subject: Re: Media Testing for maclife.de
- From: Eric Chan <email@hidden>
- Date: Sun, 14 Sep 2008 07:38:39 -0700 (PDT)
> Interesting in the context of the analogy to camera
> profiles that Eric
> introduced: you could argue that different lighting
> conditions are
> similar to different papers. So, assumed that optimally
> you'd profile
> several times for different lighting conditions (^=
> different papers),
> you could avoid that by calibrating the camera once (^=
> using
> ColorBase)) and using generic profiles afterwards.
The fundamental difference with cameras is that you don't have all the data you need. With printer profiling you have everything: the reflectance spectra, and the spectrum of the lighting used to view the print. With cameras you don't have this information at render time: you have the sample reflectance spectra and lighting spectra at profile-building time, but not at render time. When I go outside and take a picture, the camera does not know the spectra associated with each ray of light captured from the various angles.
This is not to say that profiles aren't useful, but that at best they are incomplete.
In math terms you are taking an infinite-dimensional space and projecting it down into 3 dimensions via the color filters of the sensor. This is throwing away a vast amount of information.
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden