User guide

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Chapter 6, Setting Up Realtime Effects with Adobe Premiere
$ Luma Plot Click this to plot the luminance values in the current frame
of your clip to the histogram (the plot will reflect any color correction
changes you’ve made). Each luminance value present in your image appears
as a vertical line in the histogram. A longer line indicates a higher amount
of pixels in your image of that line’s luminance value.
$ Black Use the black triangle under the histogram or the slider to define
black in your clip.
$ Gamma Use this to adjust the midtones in your clip without affecting
black or white.
$ White Use the white triangle under the histogram or the slider to define
white in your clip.
$ Auto Level Click this to define the darkest and lightest pixels in your clip
as black and white, respectively. The intermediate luminance values are
proportionally redistributed.
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Output Levels These controls let you map the values under Input Levels
to any level of black and white. Use the black and white triangles or the
sliders to achieve results such as reducing contrast in your clip, or reversing
the luminosity of your clip by setting black to a higher value than white.
Using the Matrox scopes
The Matrox vectorscope/waveform monitors are software oscilloscopes that let
you examine the video signal components of your clips. The Matrox scopes offer
various tools for analyzing different aspects of your clips (they do not affect the
video signal itself). If any adjustments are necessary based on the results, you can
use the color correction controls to make these adjustments.
¦NoteBecause your analog video is converted to a digital signal when input to
RT.X100 Xtreme, the Matrox vectorscope and waveform values provide an
analysis of your video in digital format only. Therefore, you can’t analyze the
blanking, sync, or color burst signals. Be aware that the values for the digital
signal may vary slightly from those of the analog signal output from RT.X100
Xtreme (converted from digital back to analog).
In the following sections we explain:
• How to select and view the various scopes.
• What each scope does.
• How to use the scopes to make different types of adjustments.