Apple Aperture 2 Manual do Utilizador descarregar pdf (Página 369)

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101

Chapter 15 Making Image Adjustments 369

III

Using the Auto Levels Combined Button

When you want to quickly adjust the levels of an image based on total luminance

values—red, green, and blue channels combined—you use the Auto Levels Combined

button. Red, green, and blue channels are adjusted by the same amount based on the

total luminance. You use the Auto Levels Combined button when you want to correct

the contrast of the image without modifying the color cast of the image.

To automatically adjust the levels of an image based on total luminance:

1 Select an image.

2 In either the Adjustments inspector or the Adjustments pane of the Inspector HUD, click

the Auto Levels Combined button.

The levels of the image are automatically adjusted. To fine-tune the levels adjustment,

see “Working with the Levels Controls” on page 429.

Before Auto Levels Combined adjustment

After Auto Levels Combined adjustment

Click the Auto Levels

Combined button to

automatically set the

levels for the image

based on the combined

luminance of all three

color channels.

The luminance

histogram is displayed

as a gray graph.

1 2 ... 364 365 366 367 368 369 370 371 372 373 374 ... 700 701

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