|
 |
Le 14/09/2016 à 16:09, Bald Eagle a écrit :
> clipka <ano### [at] anonymous org> wrote:
> The
>> pigment is also used in the other finish features, which are related to
>> reflection of light from somewhere else, where values above 1 make no
>> physical sense.
>
> Does that include fluorescence, such as the widespread use of optical
> brighteners in laundry detergents and printer paper?
Azurant... convert UV-radiation (invisible) into visible spectrum
(usually by doubling the wavelength). Black light is using the same system.
IMHO, you would need a non-diagonal matrix as pigment instead of a
vector to model such things (one column/row per wavelength) and a wider
vector for the light itself... and at the end, the camera collapse the
wider vector into the RGB value for the picture format.
Our traditional pigment would just be a pure diagonal matrix (everything
out of the main diagonal is 0).
>
> (I'm not trying to claim that the actual reflected light intensity would exceed
> the incident light in practice, in those two examples, but in theory I suppose
> it might be possible?
>
>
>
Post a reply to this message
|
|
