Matrox Electronic Systems Matrox RT.X2 - Manual (Page 105)

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Creating a chroma key or chroma key shadow effect
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Click the eyedropper button and click and drag anywhere on your clip to
select a rectangular area containing colors on which you want to key.
¦ Note The Show Key mode and any chroma key applied will be temporarily
deactivated in the Program Monitor when using the auto key eyedropper. This
allows you to see the original colors of your clip before any modifications
were made.
• Indicator Click this button to turn the indicator on or off.
• Handles Click this button to turn the handles for the indicator on or off.