Re: Color in Safari
Re: Color in Safari
- Subject: Re: Color in Safari
- From: Iliah Borg <email@hidden>
- Date: Sat, 16 Oct 2010 14:46:49 -0400
On Oct 16, 2010, at 12:19 PM, Roger Breton wrote:
> That means, in terms of modeling the color response of a digital camera, for
> the purpose of potentially developing profiles, it must be a nightmare,
It is, and metameric failures do not help.
> since all channels, as you show, do respond to the input color, even though
> the input is heavily filtered.
>
> How do they work around this behavior?
Simple matrix profiles help a lot, however purple/blue and red/orange problems are far too often. Next, cameramakers use LUT profiles giving end-user a choice of different types of renditions through variety of profiles - separate landscape, portrait, and other variants. Limitations of any profiles are that image should be exposed close to how the maker of the profile were doing that, half a stop difference is all the latitude allowed. More complex profiles that include spot colours are created to deal with some of metameric failure issues, colour filters on the taking lens like magenta CC40m and CC30m for daylight shooting help a lot However if situation permits I prefer to use b/w sensors and classical colour separation filters in front of the lens, making 3-shot separations. This allows film-like renditions and is much preferred by my customers.
> Do they all behave like that?
All recent cameras make a trade-off between noise, metameric failure issues, traditional colour separation and following Luther-Ives condition, a color capturing device with light detectors of three types might be used in correct color reproduction system if and only if DSS for every detector in the system might be represented as a linear combination of Cone Fundamentals (CFs). Problem is, colour reproduction is not the point of everyday photography. Film stock is not following this condition at all. Following L-I condition sometimes implemented so that while colour is resolved luminosity details are not ("mushy greens" problem). Another important thing is that it happens that the closer is the camera to satisfying L-I condition under the D55 the more problematic the colour is under different type of light. This can be seen if you compare "scores" of the camera under different light sources.
--
Iliah Borg
email@hidden
_______________________________________________
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