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

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

On Wed, 19 Feb 2003, Peter Finderup Lund wrote:

> On Wed, 19 Feb 2003, Joni Kahara wrote:
>
> > I think that is incorrect. The eye is much more sensitive to
> > frequency (colour), than to intensity. An average (human) test
> > subject can distinguish between about two dozen different gray
> > levels (Gonzalez & Woods/2e).
>
> We are good at detecting edges between slightly different intensitites,
> even of the same colour.  We are extremely bad at detecting the
> differences if there is some other colour or intensity in between.
> Built-in edge detectors at work.
>
> Also note that I wrote /spatial/.
>
> I'm afraid I can't come up with a good reference at a moment's notice --
> some of books have been lent out to others, otherwise I would have dug it
> out and either apologized profusely or whacked you on your head with it ;)

Perhaps those who are interested can look at  that. There is LOTS of links 
and I find it interesting : 

http://hyperphysics.phy-astr.gsu.edu/hbase/vision/rodcone.html

another one : 

http://www.photo.net/photo/edscott/vis00010.htm

regards

Vincent TORRI

> > Likewise, the ear is more sensitive to the pitch of a voice,
> > than to its amplitude.
>
> Different sensoric system, can't really be compared.  At least not like
> that.
>
> -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.
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-- 
TORRI Vincent
Mathematiques Appliquees Bordeaux                                                
Institut de Mathematiques                                                       
Universite Bordeaux 1                                                           
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