Re: blue flowers

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On  5 May 97 at 8:16, Geoff McAuliffe wrote:

> Hannu Jarventaus was concerned because slides or prints of blue flowers 
> did not accurately represent the blue of the flower:
> 
> I have had this problem using Ektachrome Elite to photograph blue Iris, 
> the color is "off". I don't think it is an infrared or ultraviolet 
> problem. I think this is due to a "conflict" between the pigments in the 
> flowers and the way a particular slide film records these colors. Since 
> different slide films are known to give slightly different 
> representations of the same color, the "solution" is to try a 
> different film. Color correcting filters might also be of use. 

You might want to do check the sci.optics newsgroup archives 
(altavista & dejanews) on the difference between violet and purple.
Violet is a pure color, purple a mixture of blue and red, for which
our eye has a different 'taste' than violet. This might explain the
difference between visible impression of the real subject and its
image on film. Has something to do with overlapping color ranges in
the eye as well as those on film. I believe this overlap is also what 
makes it almost impossible to estimate color effects on Ektachrome 
IR.



- -- 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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