Matrox MXO2 Installation And User Manual page 172

152
vertical line. A longer line indicates a higher amount of pixels in your image
of that line's luminance value.
¦ Note
creating a chroma key shadow effect. You can drag the handle in the luma plot
histogram to adjust the
0
Hue
•
Show 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
color at the current frame (except gray). Selecting
for
consists of a uniform key color that is evenly lighted,
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.
Chapter 10, Setting Up Matrox Effects with Adobe Premiere Pro
Plot
The graph will contain a luma plot histogram only if you are
Luminance
1 2
Saturation Saturation
Click this button to display the matte used to create your key
Click this button to automatically key on the most common
Hue , Aperture , Saturation
3
2 1 0
3
4
.
3
Aperture
Threshold
Auto Key
, and Saturation Threshold
4
Luminance
affects values
. If your clip
Auto Key
will usually
eyedropper