A change of scenery is easy using green screen techniques
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Position the Edit Line at the beginning of the sequence. Drag and drop the Auto Contrast effect into the Effect Controls window below the Color Corrector effect listing and above the Green Screen Key effect listing. Twirl down the Auto Contrast effect listing, and assign White Clip to be 0.01. (See Figure 6.)
Figure 6: The current frame before contrast adjustments (top) and the results of the Auto Contrast adjustment (bottom). Although this slightly changes the color structure of the image, it clearly does a more accurate job of removing the key and reducing the transparency of the subject. The Auto Contrast also reduced the flat, washed out coloring of the original image.
By applying the Auto Contrast to the results of the Color Corrector effect, you can reduce any gray, washed out coloring of the clip. Once the contrast of the clip is more defined, the Green Screen Key does a more accurate job of keying out the background and green area.
You can also manually create a noticeable contrast difference for the clip by going into the HSL controls of the Color Corrector effect, and selecting and adjusting Master Tonal Range Contrast.
Figure 7: The original image (top), the result of applying Auto Contrast to the clip (middle), and the result of adjusting the Master Tonal Range Contrast to 40 in the Color Corrector's HSL controls.
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Save your work.
Next, you’ll use the brand new Auto Contrast effect to adjust the contrast of your corrected image. Setting Smoothing to High ensures a higher level of sensitivity and smoothness when differentiating between the edge of what is keyed out and what is not.
