Broadcast Colors--AE

This effect alters pixel color values so that the clip can be accurately represented in a television broadcast. Computers represent colors as combinations of red, green, and blue. Consumer video equipment represents colors using different composite signals. Home video equipment cannot reproduce signals above a certain amplitude, and computer-generated colors can easily exceed this limit. (Signal amplitude is measured in IRE units; 120 IRE units is the maximum possible transmission amplitude.) Use the Broadcast Colors effect to reduce luminance or saturation to a safe level.

To achieve the same IRE level as an image with reduced luminance, reducing saturation requires greater amplitude modification, which alters the image more. Key Out Unsafe and Key Out Safe make it easier for you to determine which portions of the image will be affected by the Broadcast Colors effect at the current settings. If you make your background a contrasting color and temporarily select Key Out Unsafe or Key Out Safe, the background will be visible through affected or unaffected areas of the clip, respectively.

An unsafe level merely means that if some portions of your movie exceed the safe level, they will not look as you intended when viewed on a television monitor. Here are some guidelines for using color in movies intended for broadcast:

Note: The output you are creating should determine whether you use this effect. Many video cards, on output, will automatically reduce luminance or saturation to safe levels.

Broadcast Locale Specifies the type of broadcast standard you intend to use. NTSC (National Television Systems Committee) is the North American standard. It is also used in Japan. PAL (Phase Alternating Line) is used in most of Western Europe and South America.

How to Make Color Safe Specifies the method of reducing the signal amplitude. Reduce Luminance reduces a pixel's brightness by moving it towards black. This is the default setting. Reduce Saturation moves the pixel toward a gray of similar brightness, making it less colorful. Key Out Unsafe makes unsafe pixels transparent. Key Out Safe makes safe pixels transparent.

Maximum Signal Specifies the IRE unit level above which your clip's pixels are altered. The range is Amplitude (IRE) from 90 to 120 IRE. A level of 100 can affect a clip noticeably; a level of 120 is the maximum possible IRE and is risky. The default, 110 IRE units, is conservative.

Applying Effects > Video effects included with Premiere > Broadcast Colors--AE