Adjusting White-Balance Temperature Extremes


Before we move on from these boat images, we're going to take a look at one more characteristic of the Adjustments Inspector controls.

In the last exercise, you dragged the Temp slider all the way to the left, to a value of 2500 K. If you're experienced with lighting, you may have been surprised to find that Aperture didn't let you move the slider any lower than 2500 K. Don't worry, Aperture actually provides a much broader range of temperature options than what you've seen so far.

1.

With the boat raw image still as the primary selection, drag the Temp slider all the way to the right. The Temp value field should read 10000 K. This might seem a little conservative since there are lights that can increase color temperatures to values as high as 50,000 K.

In Aperture, the default maximum and minimum values offered in the Adjustments HUD controls reflect the "sweet spot" range that you're most likely to use. In the case of color temperature, adjustments that require values of less than 2500 or greater than 10,000 are pretty rare, so Aperture limits the slider values to a smaller range to give the slider a finer level of control. However, you can easily move beyond these ranges.

2.

Hold the cursor over the Temp value field. You should see the cursor change to an I-beam with two small arrows on either side.

3.

Click inside the Temp value field and drag to the right. As long as you drag, the value will continue to rise until it finally reaches a value of 50,000 K.

Similarly, you can drag the Temp value to the left to decrease the temperature to values below 2500.

Tip

All of Aperture's value fields work this way. Each value field can extend beyond the default sweet-spot range. You can also double-click the value and type a specific number in the value field, or you can click the left or right arrow or drag inside the value field to set a value. When using the value sliders, you can use a modifier key (Shift, Option, Control) to make value adjustments in normal, small, or large increments.

4.

Click the Reset arrow above the Temp value field to return the Temp slider to its default value.

Each adjustment control has a Reset button for easily returning to the default value.

Most likely, you'll rarely need the additional range that Aperture's adjustment controls allow. However, if you shoot in extreme situationsin very low light, or mixed lighting situations, for examplethen adjusting the values beyond the slider values could become a part of your correction workflow.




Apple Pro Training Series(c) Aperture
Apple Pro Training Series: Aperture
ISBN: 0321422767
EAN: 2147483647
Year: 2004
Pages: 185

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