Apple Shake 4 - Manual (Page 208)

208 Chapter 6 Importing Video and Anamorphic Film
VideoSafe
Located in the Color tab, this node clips “illegal” video values. As such, it is generally
placed at the end of a composite. You can set the node for NTSC or PAL video, based on
luminance or saturation. There is also an example (in the videoGamma subtree) of a
conditional statement that toggles between 2.8 (NTSC) and 2.2 (PAL). Generally, these
values are not touched.
Parameters
The VideoSafe node displays the following controls in the Parameters tab:
videoType
Toggles between NTSC and PAL.
• 0 = NTSC
• 1 = PAL
processingType
Determines whether the VideoSafe node affects the luminance or chrominance
(saturation) of the image.
• 0 = luminance-based calculation
• 1 = saturation-based calculation
chromaRange
The pseudo-percentage of the clip, as specified by the actual video hardware.
compositeRange
The pseudo-percentage of the clip, as specified by the actual video hardware.
videoGamma
The gamma basis, based upon the videoType. NTSC uses a gamma value of 2.2 and PAL
uses a gamma value of 2.8. This parameter defaults to the following expression, which
links it to the videoType parameter:
videoType ? 2.8 : 2.2