[Radiance-general] Color reflectance values and materials..

[chang cw]

Hi guys,

I am not an expert with the radiance and i do not know if i am
repeating any simple stuff here.

Colour is a function of both the reflectivity and incident light.

Reflectivity itself is an intrinsic function and in this case i think
we are assuming lambertain( equal reflectance in all direction)
materials.

The amount of light that is reflected off a surface would be dependent
on the spectral shape of the incident light and the reflectance.

So in order to talk about the color properties of different object we
need to measure its reflectance ( use of a spectrophotometer).

Perhaps we can also include the type of incident light sources (
tungsten / sunlight) if we want to talk about reflectivity

Cheers
cw



On Fri, Nov 7, 2008 at 10:52 PM, David Smith <dbs176 at gmail.com> wrote:
> Iebele,
>
> I'm about as far removed from being a color expert as one can get. I
> got the method from a thread in the forums for AGi32, and the method
> has worked reasonably well for me (some tweaking required). I'm not
> sure if the method is just a hack, but Ian Ashdown was the person who
> suggested it, as well as some further reading on color science. Here's
> the link, free registration required:
> http://www.agi32.com/forums/view_topic.php?id=585&forum_id=4
>
> Also, Konica-Minolta makes a luminance meter, CS-100A, that will give
> you the XYZE values of what it's looking at, but I'm sure it costs a
> small fortune. I think it's the one that Axel had just mentioned.
>
> --Dave
>
> _______________________________________________
> Radiance-general mailing list
> Radiance-general at radiance-online.org
> http://www.radiance-online.org/mailman/listinfo/radiance-general
>