Adobe After Effects CS4 Manual de usuario descargar pdf (Pagina 280)

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Last updated 12/21/2009

Chapter 9: Color

Color basics

Charles Poynton provides an excellent set of resources on his website regarding color technology and color

terminology.

Color depth and high dynamic range color

Color depth (or bit depth) is the number of bits per channel (bpc) used to represent the color of a pixel. The more bits

for each RGB channel (red, green, and blue), the more colors each pixel can represent.

In After Effects, you can work in 8-bpc, 16-bpc, or 32-bpc color.

In addition to color bit depth, a separate characteristic of the numbers used to represent pixel values is whether the

numbers are integers or floating-point numbers. Floating-point numbers can represent a much larger range of

numbers with the same number of bits. In After Effects, 32-bpc pixel values are floating-point values.

8-bpc pixels can have values for each color channel from 0 (black) to 255 (pure, saturated color). 16-bpc pixels can

have values for each color channel from 0 (black) to 32,768 (pure, saturated color). If all three color channels have the

maximum, pure-color value, the result is white. 32-bpc pixels can have values under 0.0 and values over 1.0 (pure,

saturated color), so 32-bpc color in After Effects is also high dynamic range (HDR) color. HDR values can be much

brighter than white.

More Help topics

“Adjust exposure for previews” on page 207

“Exposure effect” on page 462

Setting the color depth and modifying color display settings

The color depth setting for a project determines the bit depth for color values throughout a project.

To set the color depth for a project, do one of the following:

• Alt-click (Windows) or Option-click (Mac OS) the Project Settings button in the Project panel.

• Choose File > Project Settings or click the Project Settings button in the Project panel, and choose a color depth

from the Depth menu.

Project Settings button in the Project panel

You can specify a color depth for each render item, which overrides the project color depth when rendering for final

output. You can also specify the color depth to use for each output item in the output module settings. (See

“Render

settings” on page 697 and “Output modules and output module settings” on page 700.)

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