[Data-modeling] New properties for the "Visual Art" domain "Color" type

[Faye Li]

Hi,

In response to user spatialed's suggestion (from a while back), I've finally gotten to adding some properties to the empty "Color" type on Sandbox for review:

http://sandbox.freebase.com/tools/schema/visual_art/color

1) Wavelength Range (nm), expected type "Integer Range", for spectral wavelength range of the color, in nanometers.
2) Frequency Range (THz), expected type "Integer Range", for spectral frequency range of the color, in terahertz.
3) sRGB Value, expected type (new type) "RGB Representation", for 24-bit RGB representation of the color. Valid range is 0-255 inclusive for each dimension.
4) Hex Triplet, expected type "Machine readable string", for 6-digit RGB value in hex with the conventional pound sign # as a prefix.

All properties have the "restrict to one value" option checked.

As an example, I've filled out the "Red" topic with values from Wikipedia:
http://sandbox.freebase.com/view/en/red

For now, I've left out HSV hexacone and CIE XYZ color spaces (what, you can't convert color representations between color spaces in your head?), but if desired, they can be modeled without too much effort.

Thanks,
-- Faye