Matrox MXO2 PCIe Host Adapter - Manual (Page 160)

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Chapter 9, Setting Up Matrox Effects with Adobe Premiere Pro
vertical line. A longer line indicates a higher amount of pixels in your image
of that line’s luminance value.
¦ Note The Plot graph will contain a luma plot histogram only if you are
creating a chroma key shadow effect. You can drag the handle in the luma plot
histogram to adjust the
Luminance .
• Show Key Click this button to display the matte used to create your key
effect. This enables you to further refine your key. For example, when you
display the matte, your key color (such as green) appears as black, and
opaque areas appear as white. If you notice some white spots that you want
to key, you can adjust the key controls until the undesired white spots
disappear.
• Auto Key Click this button to automatically key on the most common
color at the current frame (except gray). Selecting Auto Key affects values
for Hue , Aperture , Saturation , and Saturation Threshold . If your clip
consists of a uniform key color that is evenly lighted, Auto Key will usually
give you a good-quality chroma key. Alternately, you can use the eyedropper
to select a color on which you want to key.
You can use the eyedropper in two ways:
$
Click the eyedropper button and click on a color on which you want to
key.
3
3
0 1 2
4
0
Hue
1
Saturation
2
Saturation
Threshold
3
Aperture
4
Luminance
eyedropper