On Mon, Nov 13, 2000 at 01:31:57PM -0800, Richard M. Hartman wrote:
> It would help if we knew what the constants represented ...
> -Richard M. Hartman
> [EMAIL PROTECTED]
The constants represent the relative luminance of each color. If the
same number of photons hit your cone cells, they will appear brigher
or dimmer based on color. That is one reason a green laser pointer
can go two miles where an equally powered red one only goes 1000
yards. (Your night vision is more sensitive to blue than red, but you
don't see color, so I am not talking about this - in the day on a
white wall...).
The numbers represent the mixing proportions of red, green, and blue
to produce white. Though the differences may depend on the
"temprature" of the white, normally given in degrees kelvin. A body
heated to that temprature will give off that proportion - 6000k is
much bluer than 3000k.
Most monitors have such settings and there are pages and pages of
things on the internet about this (don't get me started about Gamma
correction - I didn't do it for PiNGer and don't want to).
> Tom Zerucha wrote in message <29837@palm-dev-forum>...
> >
> >On Fri, Nov 10, 2000 at 04:53:17PM -0800, Alex Pakhotin wrote:
> >> Hi Hans,
> >>
> >> gray = 0.299*r + 0.587*g + 0.114*b
> >
> >I think the equation I use has slightly different constants.
> >
> >I do this for PiNGer (the viewer for ZBoxZ - GPL OpenSource
> >palmboxer.sourceforge.net) to display color PNG and GIF files on
> >grayscale palms.
> >
> >
>
>
>
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