5.1.1

Chapter 19 Filters 772
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Red: Adjusts the color gain applied to the midtone range of the red color channel.
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Green: Adjusts the color gain applied to the midtone range of the green color channel.
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Blue: Adjusts the color gain applied to the midtone range of the blue color channel.
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Highlights: Adjusts color channels in the lightest regions of the image. Click the color well
to open the Colors window, then adjust the color balance of the brightest portion of the
image. An eyedropper lets you sample any color in the Canvas to use for balancing the image.
You can also click the disclosure triangle to reveal red, green, and blue channel slider with a
numeric range from 0 (no color) to 0.5 (unaltered color) to 1.0 (maximum color).
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Red: Adjusts the color gain applied to the highlights of the red color channel.
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Green: Adjusts the color gain applied to the highlights of the green color channel.
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Blue: Adjusts the color gain applied to the highlights of the blue color channel.
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Clip Color Values: Turns clipping on and o. Clipping prevents color adjustments from forcing
color values out of the allowable digital range. Clipping can prevent illegal signal levels in clips
that are output to video. This pop-up menu has four options:
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None: No clipping occurs.
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At White: Any color channel exceeding the maximum value of 1 is clipped to 1.
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At Black: Any color channel falling below the minimum value of 0 is clipped to 0.
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At Black and White: All color channels are clipped to a minimum of 0 and a maximum of 1.
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Mix: Sets the percentage of the original image to be blended with the color-corrected image.
Use the Color Balance lter to match two composited layers
This example demonstrates how to use the Color Balance lter to match the color of a green-
screened foreground image to a background plate. A green screen clip has been composited
with a background layer using the Keyer lter. (For information about using the Keyer lter, see
Keyer lter overview on page 488.) The background layer has already been modied with the
Defocus and Contrast lters to appear moody and blurred (simulating a shallow depth of eld).
Although the key is successful, the light illuminating the woman doesn’t quite match the light
that illuminates the background.
You can x this using the Color Balance lter.
Match a foreground subject to a background image using the Color Balance lter
1 Open the Library, click the Filters category, then click the Color Correction category to reveal the
color correction lters in the stack.
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