Matrox MXO2 Guia do Utilizador descarregar pdf (Página 149)

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Overview of the Matrox chroma key effects

4 Apply a mask surrounding the colored object you want to remain intact (see

the next section, “Applying a mask to your Matrox effects).

5 Select Expand Outside Mask.

Overview of the Matrox chroma key effects

You can apply a Matrox chroma key or chroma key shadow effect to make certain

areas of a foreground image transparent based on a color in that image, so that an

underlying image can show through.

In the following example of a chroma key effect, our foreground image is a video

clip of a woman sitting in front of a green backdrop, and our underlying image is

a video clip of a sand dune:

By chroma keying on the particular shade of green in the backdrop of the

foreground image, the backdrop area becomes transparent and the corresponding

area of the underlying image shows through in the composite image as follows:

¡ Important The chroma key shadow effect includes controls for fine-tuning

shadows in your effect. It is best to use the chroma key shadow effect when you

are performing a chroma key without any additional effects. If you want to apply

Foreground image

Underlying image

Result of chroma key

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