Adobe 12040118 Tutorial - Page 244

Note: The sampleImage expression method is another way to sample color values. Use this method to use color values of specific pixels as input into an expression. (See Layer General attributes and methods (expression reference).) A. Opacity stop B. Color stop C. Opacity midpoint D. Eyedropper E. New-color rectangle F. Original-color rectangle Choose a color picker Choose Edit > Preferences > General (Windows) or After Effects > Preferences > General (Mac OS), and do one of the following: To use the color picker provided by the operating system, select Use System Color Picker. To use the Adobe Color Picker, deselect Use System Color Picker. Jeff Almasol provides the PickerSwitcher script on his redefinery website, which toggles the Use System Color Picker setting. Use this script when you prefer to use the Adobe Color Picker for certain tasks, but the operating system color picker for others, and want a quick way to change this setting. This script works especially well in conjunction with the LaunchPad panel, with which running the PickerSwitcher script is as easy as clicking a button. To download the LaunchPad script, go to the After Effects Exchange on the Adobe website. Select a color with the eyedropper tool 1. Click the eyedropper button, and move the pointer to the pixel that you want to sample. The color swatch next to the eyedropper button dynamically changes to the color under the eyedropper. 2. Do one of the following: To select the color of a single pixel, click the pixel. To sample the color average of a 5-pixel-by-5-pixel area, Ctrl-click (Windows) or Command-click (Mac OS) the area. Note: When sampling from within the composition frame of the Composition panel, the eyedropper by default ignores the composition background color and samples only straight color channels. To sample color channels premultiplied with the composition background color, press Shift as you click with the eyedropper. Shift-clicking with the eyedropper samples colors as they appear in the composition frame in the Composition panel. You can use the Sampler Sizer Radio script from the Leapfrog Productions website to change the area sampled by the eyedropper tool. Press the Escape key to deactivate the eyedropper. Select a color with the Adobe Color Picker 1. Click a color swatch to display the Adobe Color Picker. 2. (Optional) To prevent panels from updating with the results of your color selection until you accept the color by clicking OK, deselect Preview in the Color Picker dialog box. The Preview option is not available in all contexts. Note: Selecting Preview is convenient for seeing the results of your color selections before you commit them, but it can also decrease performance, as new images are rendered for the preview in the Composition panel or Layer panel. 3. Select the component you want to use to display the color spectrum: H Displays all hues in the color slider. Selecting a hue in the color slider displays the saturation and brightness range of the selected hue in the color spectrum, with the saturation increasing from left to right and brightness increasing from bottom to top. S Displays all hues in the color spectrum with their maximum brightness at the top of the color spectrum, decreasing to their minimum at the bottom. The color slider displays the color that's selected in the color spectrum with its maximum saturation at the top of the slider and its minimum saturation at the bottom. B (in the HSB section) Displays all hues in the color spectrum with their maximum saturation at the top of the color spectrum, decreasing to