
Resizing Media
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Options Description
Key menu Determines how the video track’s alpha information is
used. The menu options are:
No Alpha. Ignores the video track’s alpha channel and
makes the image 100% opaque.
Straight Alpha. Displays the area of the image defined
by the alpha channel.
• Makes the area of the image where the alpha channel
is black (0 pixels) transparent.
• Makes the area of the image where the alpha channel
is white (255 pixels) opaque.
• Portions of the image with alpha channel levels
between white and black (gray) are displayed with
intermediate levels of transparency.
Premultiplied Black. Video tracks whose alpha channels
are premultiplied with a solid black or white color,
respectively.
Key menu (continued) Premultiplied White. Video tracks whose alpha channels
are premultiplied with a solid black or white color,
respectively.
If a video track’s alpha channel is premultiplied with a
color other than white or black, set the Alpha Channel to
Straight Alpha and use the Premultiplied Alpha Key filter
to remove colored edges after the file is imported.
Invert Alpha option Inverts the media’s original alpha channel, making areas
where the alpha channel is black (0 completely opaque),
and areas where the alpha channel is white (255
completely transparent).
Flip Image menu Lets you flip the image. The choices include:
• Never. Leaves the image unchanged,
• Horizontal. Flips image horizontally.
• Verti cal. Flips image vertically.
• H + V. Flips the image both horizontally and
vertically.
Info box Displays the image size in pixels and the duration in
frames (read only).
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