Setting the monitor's white point

Now you'll adjust the hardware white point, the whitest white that a monitor is capable of displaying. The white point is a measurement of color temperature in Kelvin and determines whether you are using a warm or cool white.

First, you'll make sure that the white-point setting matches the white point of your monitor. Do one of the following:

• If you know the white point of your monitor in its current state, you can select it from the Hardware menu in the White Point section. If your monitor is new, select 9300 Kelvin, the default white point of most monitors and televisions.

p White Point Hardware:

9300' K (cool white]

Measure... |

Adjusted:

5000' K [warm white) 5500'K

6500+ K (daylight) 7500'K

9300* K I cool white!

Cancel | Wizard

Custom...

• If you started from a manufacturer's profile for your monitor, you can use the default value. However, the older your monitor, the less likely it is that its white point still matches the manufacturer's profile.

• If your monitor is equipped with digital controls for setting the white point, and you already set those controls before starting Adobe Gamma, make sure that the Hardware menu matches your monitor's current setting. Remember, though, that if you adjust these hardware controls at this point in the calibration process, you'll need to start over, beginning with the procedure in "Setting the optimal brightness and contrast" on page 538.

• If you don't know the white point and don't know the appropriate values, you can use the Measure option to visually estimate it. If you choose this option, continue to step 1.

To get a precise value, you need to measure the white point with a desktop colorimeter or spectrophotometer and enter that value directly using the Custom option.

If you were unable to choose a hardware setting as described, try the following experiment:

1 For best results, turn off all lights in the room.

2 Click Measure, and then click OK (Windows) or Next (Mac OS). Three squares appear.

The goal here is to make the center square as neutral gray as possible. You'll train your eyes to see the contrasts between the extreme cooler (blue) white and warmer (yellow) white, and then adjust the colors in the squares to find the most neutral gray between them.

3 Click the left square several times until it disappears, leaving the middle and right squares. Study the contrast between the bluish square on the right and the center square.

□ □□□□

Clicking on the left square will reset all the squares a shade cooler.

4 Click the right square several times until it disappears, and study the contrast between the yellowish square on the left and the center square.

Clicking on the right square will reset all the squares a shade warmer.

5 Click the left or right square until the center square is a neutral gray. When complete, commit the changes by clicking the center square.

» For a color illustration of adjusting the white point, see figure 17-1 of the color section.

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