Apple MA434Z/A User Manual - Page 901
Gamma in RGB Image Files and Sequences, What causes this?
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Solution You can load Shake's viewer lookup controls into the Parameters tab, then change the viewerGamma parameter to .818 to preview how your composition will look in the Final Cut Pro Canvas. This only changes how your image is displayed in the Shake Viewer, and does nothing to change the gamma of the script's final rendered image. What causes this? Final Cut Pro assumes that QuickTime movies for codecs that support the YUV color space (including DV, DVCPRO 50, and the 8- and 10-bit Uncompressed 4:2:2 codecs) are created with a gamma of 2.2. This is generally true of movies captured from both NTSC and PAL sources. When you eventually output the sequence to video, or render it as a QuickTime movie, the gamma of the output is identical to that of the original, unless you've added color-correction filters of your own. However, during playback on your computer's monitor, Final Cut Pro automatically lowers the gamma of a sequence playing in the Canvas to 1.8 for display purposes. This is to approximate the way it will look when displayed on a broadcast monitor. This onscreen compensation does not change the actual gamma of the clips in your sequence. Gamma in RGB Image Files and Sequences When importing a still image file or sequence from Shake into Final Cut Pro, the gamma may be incorrectly boosted when the sequence is output to video or rendered as a QuickTime movie. Solution Convert image sequences to QuickTime movies using a FileOut node in Shake for Mac OS X, prior to importing them into Final Cut Pro. This makes them easier to import, and also ensures that their gamma won't be changed. For the highest quality, use either the Uncompressed 8- or 10-bit 4:2:2 codec when performing this conversion, depending on the bit depth of the source image files. QuickTime Player is not recommended for this operation, as it may perform an unwanted bit-depth conversion with greater than 8-bit images. What causes this? Final Cut Pro assumes that all RGB image files are created with a gamma of 1.8. When RGB image files are imported into Final Cut Pro and edited into a sequence set to 8- or 10-bit YUV rendering, the gamma is automatically boosted to 2.2 in an attempt to match the other video files in your project. This boosted gamma is then used when the sequence is output to video or rendered as a QuickTime movie. During playback on your computer's monitor, Final Cut Pro lowers the gamma of the sequence playing in the Canvas to 1.8 for display purposes. This is to approximate the way it will look when displayed on a broadcast monitor. The still image clips in your sequence are still boosted when the sequence is output to video or rendered as a QuickTime movie. Chapter 29 Optimizing and Troubleshooting Your Scripts 901
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