Matrox Electronic Systems Matrox RT.X2 - Manual (Page 66)

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Chapter 4, Setting Up Realtime Effects with Adobe Premiere Pro
Using Select Mask
To apply a mask to your Matrox effect using the Select Mask dialog box, click
the triangle next to the Select property to expand it, then click the Select Mask
button:
The Select Mask dialog box allows you to apply a mask in two ways:
• Click and drag directly in the Select Mask window to create the rectangular
area where you wish to apply the mask.
You can resize the mask area by dragging any side of the rectangle. For
example, dragging the right side of the rectangle adjusts the right edge of the
mask area. To resize the entire mask area at once, drag one of the corners
(the corner that’s diagonally opposite the corner you are moving will remain
stationary).
• Use the Left , Right , Top , and Bottom controls to adjust any edge of your
mask by a given number of pixels. You can enter values in the text boxes or
drag the sliders to resize your mask area. For example, drag the
Left slider to
adjust the left edge of your mask area.