2018.x

Working with Imported Graphics and Animation
206
To import a QuickTime file as a moving matte:
1. Click the Image tab of the Import Settings dialog box.
2. In the Alpha parameter category, select either Use Existing or Invert Existing.
To import a graphics sequence as a moving matte:
1. Select the first file in the sequence as the file to import.
2. In the Image tab of the Import Settings dialog box, select Autodetect Sequential Files.
Your Avid editing application uses all the files in the sequence to make the moving matte. If you
import only one graphic file with alpha, it becomes a static matte.
Your Avid editing application creates a real-time Matte Key effect with nested alpha and video
fill. To preserve real-time performance, your Avid editing application locks the alpha track so
that you cannot replace it.
Using the Color Effect to Prepare a High-Contrast Image
This topic describes how to enhance high-contrast images for use in creating Matte Key effects. You
can also import a graphic image with an alpha channel and use it as a Matte Key effect. For more
information, see “Working with Imported Graphics and Animation” on page 206.
To create a high-contrast image from available footage:
1. Apply the Color Effect to the clip.
For more information, see “Applying Effects” on page 27.
2. Enter Effect mode, for example, by clicking the Effect Mode button.
For more information, see “Entering Effect Mode” on page 32.
3. Change the Luma Range to 0 to 255.
4. Drag the Sat (saturation) slider under Chroma Adjust all the way down to remove all color
saturation from the image.
5. Adjust the Gamma to change the color of the midtones.
You can now use the high-contrast image as a matte for the key effect, as described in “Creating
a Matte Key Effect” on page 204.
6. (Option) Black portions of the high-contrast image are transparent and white portions are
opaque. To switch the order, use the Reverse option in the Foreground parameter category of the
Matte Key effect.
Working with Imported Graphics and Animation
This topic describes two different methods for editing with imported graphic images, depending
upon whether:
• The image was imported as a master clip with no alpha channel (an opaque graphic element).
• The image was imported as a Matte Key clip with an alpha channel (a keyable graphic element
for video overlay).
Both single-frame graphic images (such as a single JPEG file) and multiple-frame animation
sequences (such as a JPEG file sequence) appear in the bin in the same form after import, and
you use the same editing techniques for both. You can edit this type of clip into a sequence as a
standard matte key overlay.