Adobe After Effects CS4 - Manual (Page 472)

466 USING AFTER EFFECTS CS4
Effects and animation presets
Last updated 12/21/2009
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 the Gamma value affects.
More Help topics
“ Gamma and tone response ” on page 282
“ Color correction and adjustment ” on page 279
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)
More Help topics
“ Levels effect ” on page 465
“ Color correction and adjustment ” on page 279
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.