Matrox Electronic Systems Matrox RT.X2 - Manual (Page 103)

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Creating a chroma key or chroma key shadow effect
Using the chroma key graph to modify key
colors and perform an auto key
To modify your key colors directly within the chroma key graph or perform an
auto key, click the triangle next to the
Graphical property to expand it:
• Map This is the default view when you first expand the Graphical
property. You can drag the handles in the color spectrum to move the
indicator to different regions in the cube to adjust the
Hue , Aperture ,
Saturation , and Saturation Threshold .
¦ Note This graph will contain a luminance spectrum only if you are creating a
chroma key shadow effect. You can drag the handle in the luminance spectrum to
adjust the
Luminance.
• Plot Click this button to plot the colors and luminance values that are
present in the current frame of your clip. You can drag the handles in the
chroma plot graph to move the indicator to different regions in the graph to
adjust the
Hue , Aperture , Saturation , and Saturation Threshold . The
luma plot histogram shows each luminance value present in your image as a
2 1 0
3
3
4
0
Hue
1
Saturation
2
Saturation
Threshold
3
Aperture
4
Luminance