Color Temperature and

You can manipulate color temperature at various stages by using your RAW editor or the camera's white balance settings. The term "color temperature" defines the composition of the light at a device's white point (i.e., the composition of light emitted by an ideal light source at a specific temperature) and is stated in Kelvin units (K).

Contrary to our normal color perception, the higher the color temperature of a light source, the more blue components it will have. Conversely, the lower a light's color temperature, the "warmer" it will appear (i.e., it will contain more red tones). Table 3-1 lists some examples of color temperatures for various light sources. You can find a more detailed explanation of how color temperature is calculated on page 173.

Table 3-1: Color Temperatures of Various Light Sources

Candlelight, Fire Tungsten, 60 Watt Tungsten, 100 Watt Halogen lamp Moonlight D50 Daylight Daylight Direct sunlight Sun and blue sky D65 daylight Flash

Cloudy sky Neon Light Sunny mountain snow

Figure 3-36 shows the curve that is formed within a color space when the white point of an image is shifted. The horizontal position is influenced by shifts in color temperature and the vertical axis shows changes in color tone (hue). There is an example of this type of adjustment (made using Adobe Camera Raw) in figure 5-35, page 161. The "Hue" slider is also present in a number of other Photoshop tools, including the Hue/Saturation command described earlier.

1000-1800 K 2600 K 2700 K

3400 K

4100 K 5000 K 5300 K 5400 K 5800 K 6500 K 6500 K 7000-8000 K 8000-9000 K up to 16000 K

Figure 3-37: The color wheel showing two examples of complementary colors

y

0.8

0.6

r

\ Hue

\ ^^^ Tungsten (ca

. 2700 K)

0.4

\ S3 "XCandle light (ca. 1500 K)

D65/^° Color ■

temperature

/ Mountain snow

0.2

(ca. 16000K)

c

1 0.2 0.4 0.6

Color temperature and tone curves in a color space

Figure 3-36:

Color temperature and tone curves in a color space

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