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Re: PHOTO: Camera changing color of QUICKEN ...

  • Subject: Re: [iris-photos] PHOTO: Camera changing color of QUICKEN ...
  • From: Gerry Snyder gerry.snyder@comcast.net
  • Date: Sun, 14 May 2006 08:40:45 -0700

La Vie En Rose Gardens wrote:
> Why is my camera changing the colour of my QUICKEN from a purple to a
> blue??????

The camera and the eye both have detectors sensitive to red, green, and 
blue, but their response curves are different. That is, each color--red, 
orange, yellow, ..., blue, violet--is not a single wavelength but a 
range of wavelengths. The eye's blue sensor might be most sensitive to 
the greenish side of blue, while the camera's is most sensitive to the 
violet side of blue.

With many different pigments in the iris, the spectrum of light coming 
from it is complicated. Two very simiolar-looking blues can have very 
different spectra. Even if a system is set up so that one blue, in one 
lighting condition, is correct, another one won't be.

Film makers and digital camera makers work very hard to make colors look 
good (which is kinda related to looking accurate). But the highest 
priority in general is flesh tones. Another fairly high priority is a 
blue sky. Compromises must be made for other colors. Some things just 
have to come out wrong.

So, given all the above complications, Quicken is blue instead of purple 
because the camera maker didn't want the sky to come out purple.


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