Levels (individual controls) effect, Photo filter effect – Adobe After Effects CS3 User Manual
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AFTER EFFECTS CS3
User Guide
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Input Black and Output Black
Pixels in the input image with a luminance value equal to the Input Black value are
given the Output Black value as their new luminance value. The Input Black value is represented by the upper left
triangle below the histogram. The Output Black value is represented by the lower left triangle below the histogram.
Input White and Output White
Pixels in the input image with a luminance value equal to the Input White value are
given the Output White value as their new luminance value. The Input White value is represented by the upper right
triangle below the histogram. The Output White value is represented by the lower right triangle below the histogram.
Gamma
The exponent of the power curve that determines the distribution of luminance values in the output image.
The Gamma value is represented by the middle triangle below the histogram.
Clip To Output Black and Clip To Output White
These controls determine the results for pixels with luminance values
that are less than the Input Black value or greater than the Input White value. If clipping is on, pixels with luminance
values less than the Input Black value are mapped to the Output Black value; pixels with luminance values above the
Input White value are mapped to the Output White value. If clipping is off, the resulting pixel values can be less than
the Output Black value or greater than the Output White value and are affected by the Gamma value.
Levels (Individual Controls) effect
The Levels (Individual Controls) effect functions like the Levels effect but allows you to adjust the individual color
values for each channel. As a result, you can add expressions to individual properties or animate one property
independently of the others. To see each control individually, click the arrow next to the channel color to expand it.
This effect works with 8-bpc, 16-bpc, and 32-bpc color.
Original (left), and with effect applied (right)
See also
Photo Filter effect
The Photo Filter effect mimics the technique of putting a colored filter in front of the camera lens to adjust the color
balance and color temperature of the light transmitted through the lens and exposing the film. You can choose a
color preset to apply a hue adjustment to an image, or you can specify a custom color using the Adobe Color Picker
or the eyedropper.
You can use the Photo Filter effect controls to do the following:
•
To use a color preset for the filter color, choose an option from the Filter pop-up menu.
•
To select a custom color for the filter color, click the Color control’s color swatch to select a color using the Adobe
Color Picker, or click the eyedropper and click a color anywhere on the computer screen.
•
To set the amount of color applied to the image, adjust Density.
•
To ensure that the image isn’t darkened by the effect, select Preserve Luminosity.