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

[Peter Finderup Lund <firefly diku dk>]

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 ;)

> 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.