Apple Color 1.0 User Manual download pdf (Page 31)

Chapter 1 Color Correction Basics 31

Gamma

Gamma refers to two different concepts. In a video signal, gamma refers to the

nonlinear representation of luminance in a picture displayed on a broadcast or

computer monitor. Since the eye has a nonlinear response to light (mentioned in

“The Y’C

Color Model” on page 24), applying a gamma adjustment while recording

an image maximizes the perceptible recorded detail in video signals with limited

bandwidth. Upon playback, a television or monitor applies an inverted gamma

function to return the image to its “original” state.

You want to avoid unplanned gamma adjustments when sending media from

Final Cut Pro to Color. It’s important to keep track of any possible gamma adjustments

that occur when exporting or importing clips in Final Cut Pro during the editing

process, so that these adjustments are accounted for and avoided during the

Final Cut Pro to Color round trip. For more information on gamma handling in

Final Cut Pro, see the Final Cut Pro User Manual.

Gamma is also used to describe a nonlinear adjustment made to the distribution of

midtones in an image. For example, a gamma adjustment leaves the black point and

the white point of an image alone, but either brightens or darkens the midtones

according to the type of adjustment being made. For more information on gamma and

midtones adjustments, see Chapter 9, “Primary In,” on page 163.

Chroma (Chrominance)

Chroma (also referred to as chrominance) describes the color channels in your shots,

ranging from the absence of color to the maximum levels of color that can be

represented. Specific chroma values can be described using two properties, hue and

saturation.

Hue

Hue describes the actual color itself, whether it’s red or green or yellow. Hue is

measured as an angle on a color wheel.

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Apple Color 1.0 User Manual Page 31