2008

Range=0.0 to 200,000.0 candelas. Default=1500.0.
A single candle is approximately 1 candela (the unit can also be called a
"candle"). A 100-Watt (W) incandescent light bulb is approximately 139
candelas (cd). A 60W bulb emitting in all directions is about 70 cd, while the
same bulb with a reflector is about 4500 cd because the light flux is
concentrated into a narrow angle.
Photometric lights are unaffected by the Physical Scale value.
This parameter is animatable.
Color correction check box and color swatch When the check box is turned
on, color correction shifts all colors so the color displayed in the color swatch
appears as white. Default=off.
Clicking the color swatch displays a
Color Selector on page 331 so you can
choose the color to adapt to.
You can use this control to simulate how the eye adjusts to lighting. For
example, even when the light in a room has a yellow hue from an incandescent
light bulb, we will continue to perceive objects that we know to be white,
such as printed pages, as white.
TIP For the best results, use a very pale color correction color, such as a pale blue
or pale yellow.
Desaturate Low Levels When on, renders dimly lit colors as if the light were
too dim for the eye to distinguish between colors. When on, renders even
dimly lit colors. Default=off.
Desaturate Low Levels simulates the eye's response to dim lighting. In dim
lighting, the eye does not perceive colors and sees tones of gray instead.
The effect of this setting is not apparent except at very low light levels, below
5.62 footcandles (lumens per square foot). When the illuminance is less than
0.00562 footcandles, the scene is completely gray.
NOTE 1 footcandle (fc) equals 10.76 lux (lumens per square meter).
Linear Exposure Control
Rendering menu > Environment > Environment and Effects dialog >
Environment panel > Exposure Control rollout > Choose Linear Exposure
Control from the list. > Linear Exposure Control rollout
Exposure Controls | 6537