TOTALLY OFF TOPIC: 24-bit-per-pixel limit to Gdk RGB ?

[TORRI Vincent <Vincent Torri math u-bordeaux fr>]

On Wed, 19 Feb 2003, Thomas Cameron wrote:

> Peter Finderup Lund wrote:
>
> > On Wed, 19 Feb 2003, TORRI Vincent wrote:
> >
> >  
> >
> > > http://hyperphysics.phy-astr.gsu.edu/hbase/vision/rodcone.html
> > >
> > > another one :
> > >
> > > http://www.photo.net/photo/edscott/vis00010.htm
> > >    
> >
> > Still couldn't find the reference I was looking for.  Maybe I just didn't
> > look hard enough.  The story is that somebody was experimenting with
> > extremely high-quality printing devices in some research institution which
> > I think was the research branch of a big US company.  Just as a lark they
> > printed words with an extremely small intensity difference between the
> > words themselves and the background.  They were extremely surprised that
> > it turned out to be easily readable.  Then they did it again under more
> > controlled conditions and wrote a paper about it.  I know that it is
> > referenced in Gleitman's introductory text book on Psychology.  Maybe
> > somebody can help me find it...?
> >
> > I also didn't find any mention in the above links of the edge detection
> > circuitry in the eyes that is responsible for Mach banding.
> >
> > http://www.yorku.ca/eye/machband.htm

One thing about this link : the fact presented at this link looks like the 
Gibbs phenomenum in the Fourier analysis. Quite interesting, as we can 
consider that the eye make a Fourier transform, according to some papers 
(the eye detects the wavelength (or the frequencies, as you want) of the 
colors)

> > -Peter
> >
> > "Of course, I'm not unbiased, but in my humble opinion, I've
> >  gotten close to something that I can be really proud of."
> > -- Knuth on The Art of Computer Programming.
> >  
> Hello all,
>
>     Also note that we are discussing differences in _intensities_ here, 
> not differences in grayscale colors.  Unfortunately, grey is infact a 
> color, and thus the argument that we can only detect a few dozen greys 
> is moot.

Even if gray is a color, I am wondering if two different gray colors have 
the same wavelengths and two different intensities, or not...

Vincent TORRI

> Tom Cameron
>
>
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-- 
TORRI Vincent
Mathematiques Appliquees Bordeaux                                                
Institut de Mathematiques                                                       
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