Matrox Electronic Systems Matrox RT.X2 - Manual (Page 65)

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Applying a mask to your effect
Applying a mask to your effect
Many of the Matrox effects allow you to add a mask to define the area where you
want to apply your effect. For example, you may want to apply a color correction
to only one area of your clip and leave the rest of the clip untouched.
Adding a mask to the chroma or luma key effect and selecting Transparent
Outside Mask lets you disable keying in the area outside the mask so that only
the underlying image appears outside the mask. For example, you can define a
mask area where you want the keying to be performed, and show only your
underlying image outside the mask. This is useful if you’re having problems
keying on an area at the edges of your foreground image.
° To adjust the mask properties:
Click the triangle next to Mask to expand the property list.
The properties under Mask let you control the area on the clip where you want to
apply the mask. You can enter the values you want in the text boxes or drag the
appropriate sliders (
Left , Right , Top , and Bottom ).
• Left Adjusts the left edge of your mask.
• Right Adjusts the right edge of your mask .
• Top Adjusts the top edge of your mask.
• Bottom Adjusts the bottom edge of your mask.
• Select Mask Displays a dialog box in which you can apply your mask
settings (see “Using Select Mask” on page 58 ).
• Invert Inverts the mask so that your effect is applied outside the mask,
instead of within the mask.