Adobe After Effects CS3 Manual de usuario descargar pdf (Pagina 255)

AFTER EFFECTS CS3

User Guide

250

Simulate an output type in a movie rendered for final output

Color management for output simulation is only for previews, but you can render a movie with a look that simulates

a particular output type. For example, you can render a movie for HDTV that simulates a film appearance. This is

especially useful for creating dailies when doing film work.

1 Choose Layer > New > Adjustment Layer to create a new adjustment layer at the top of your composition.

2 Choose Effect > Utility > Color Profile Converter to apply the Color Profile Converter to the adjustment layer.

3 Choose Edit > Duplicate to duplicate the effect.

4 In the Effect Controls panel, set the following options for the first instance of the effect:

Input Profile Project Working Space

Output Profile The type of output to simulate; for example, a film printing density profile, such as Kodak 5218/7218

Printing Density

Intent Absolute Colorimetric

5 In the Effect Controls panel, set the following options for the second instance of the effect:

Input Profile The type of playback to simulate; for example, a theater preview profile

Output Profile The color space of the output medium; for example HDTV (Rec. 709)

Intent Relative Colorimetric

Toenableanddisablethiskindofoutputsimulation,youcanturntheadjustmentlayeronandoffbyselectingand

deselecting its Video switch in the Timeline panel.

Broadcast-safe colors

Analog video signal amplitude is expressed in IRE units (or volts in PAL video). Values between 7.5 and 100 IRE

units are considered broadcast-safe; colors in this range do not cause undesired artifacts such as audio noise and color

smearing. (In practice, some spikes over 100 IRE are legal, but for simplicity 100 IRE is considered the legal

maximum here.) This range of 7.5-100 IRE is equivalent to a range from black to white of 64-940 in 10-bpc values

for Y' in Y'CbCr, which corresponds to 16-235 in 8-bpc values. Therefore, many common video devices and software

systems interpret 16 as black and 235 as white, instead of 0 and 255. These numbers don’t directly correspond to RGB

values.

If you notice that colors of imported footage look wrong—blacks don’t look black enough, and whites don’t look

white enough—make sure that you’ve assigned the correct input color profile. The common video color profiles

included with After Effects include variants that account for these limited ranges, such as the HDTV (Rec. 709) 16-

235 color profile, which interprets 16 as black and 235 as white.

Note: Some video cards and encoders assume that output is in the range 0-255, so limiting colors in your composition

and rendered movie may be redundant and lead to an undesired compression of the color range. If colors of your output

movie look dull, try assigning an output color profile that uses the full range of colors.

You can use the Broadcast Colors effect to reduce luminance or saturation to a safe level, but the best way to limit

output colors to the broadcast-safe range is to create your composition to not use colors out of this range. Keep the

following guidelines in mind:

• Avoid pure black and pure white values.

• Avoid using highly saturated colors.

• Render a test movie and play it on a video monitor to ensure that colors are represented accurately.

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Adobe After Effects CS3 Manual de usuario Pagina 255

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