Colour Temperature and what Kelvin has to do with it!

Grazie wrote on 10/30/2004, 12:31 PM
At long last I've stumbled across the "missing-link" for me:

Colour Temperature

AND

Black Radiators

. . don't get too hung up on the formulas . .just read it . ..

Regards,

Grazie

Comments

nickle wrote on 10/30/2004, 1:57 PM
Color (or for you "colour") theory has been going on for centuries. Art is in the eye of the beholder. Sort of like taking clean crisp dv footage and applying scratches and graininess (film looks) and liking it better.

I recall driving through a tunnel and the overhead lights actually changed the colors of the cars. They changed back to the original color when exiting the tunnel. Weird stuff.

As for white balance to get accurate colors well that is a given, but applying filters or color correction for artistic effects, with masking etc. is a whole new ballgame.
farss wrote on 10/30/2004, 2:39 PM
It's fairly easy to build your own black body radiator. Paint the inside of a shoe box matte black. Make a pin hole in one end. Any light that enters the hole will not come out so your shoe box is now very close to an ideal black body radiator.
So this is ideal for setting white balance. Place shoe box in oven with pin hole facing glass door. Mount camera on tripod short distance from oven focused on pin hole and raise temperature of black body to 5000 deg K. Once shoe box reaches temperature WB camera and all is done.

Anyone silly enough to try this, please post footage.

Bob.
Grazie wrote on 10/30/2004, 3:00 PM
I take size 9 boots . .that's my footage . . hah!
JJKizak wrote on 10/30/2004, 4:43 PM
When I get to be President I will eliminate the Celcius and Farenheit
scale and replace them and inforce the Kelvin scale.

JJK
nickle wrote on 10/30/2004, 5:22 PM
Like the saying goes, I can't criticize you until I walk a Kelvin in your shoes.
rmack350 wrote on 10/30/2004, 11:13 PM
Dang It! Now I have to get a new oven. And potholders!

Rob Mack
JackW wrote on 10/31/2004, 12:07 PM
Actually it's not as much fun as a shoe box in the oven, but http://www.olympusmicro.com/primer/java/colortemperature/index.html shows what a black-radiator looks like and how the color changes relative to the temperature.

Jack
mhbstevens wrote on 11/1/2004, 1:48 PM
Both Farenheight and Celcius (Centigrade) are both somewhat arbituary. Farenheight base on a long-outdate belief that 0F is as cold as it gets and Celcius based on the freezing and boiling points of water, but only in certain places and at certain times, so it would be nice of we all could use Lord Kelvin's absolute system wher zero really is as cold as it gets a nd where each degree can be specifically defined.

Doing this however will not relieve you of the need to set your white balance.



nickle wrote on 11/1/2004, 2:25 PM
And while we are at it, let's get those Southern Hemisphere countries to get with the program and have it hot in summer and cold in winter.