To set the Knife tool options: 
Double-click the Knife tool and select from the following options. 
v  Select  Freehand to make a freehand cut or straight to make a straight cut. If  you are using the freehand operation, you can hold down Alt as you drag  to cut a straight line. Hold down Shift to constrain it.
v  Enter  a value from 0 to 72 points in the Width text box or set the Width with  the slider control. A width of 0 gives a single, thin cut. Higher  values will make two cuts spaced according to the Width value.
v  Select  Close Cut Paths to close the resulting paths and to display the stroke  and fill of the original path. Deselect the option to keep the resulting  paths open and to display only the stroke. 
v  Select Tight Fit to make a cut that closely follows the path of your hand movements.
To split a selected path with the Knife tool: 
1.      Drag the Knife tool across the path. 
To split paths using the Split command: 
1.      Select one or more paths.
2.      Select one or more points on each path. The path will be split at each point you select.
3.      Choose Modify > Split.
Using the Swatches panel
The  Swatches panel lets you store colors, edit and rename them, convert  process colors to spot colors and vice versa, change the color mode (RGB  and CMYK), and import and export custom color libraries. 
To show or hide the Swatches panel, do one of the following: 
v  Click the Swatches button in the Main toolbar. 
v  Choose Window > Panels > Swatches. 
            Swatches panel
 
The  Swatches panel displays the color list for the active document. It also  has three selectors: the Fill (left), Stroke (center), and both for the  combined Fill and Stroke (right). The active selector is pressed. The  selectors show the colors for a selected object. The colors also appear  in the color boxes in the Tools panel. 
Active Fill selector, no stroke; differing fill and stroke
The  default colors in a new document are None, White, Black, and  Registration. These colors cannot be deleted or renamed. Black is a spot  black that prints on the process black plate. The registration color  used for crop marks or trim marks, prints solid on all color  separations. 
The  Swatches panel displays process color names in italics, spot color  names in plain type, with a triple-dot icon next to RGB colors, no  symbol for CMYK colors, and a black hexagon for Hexachrome colors. RGB  colors include those created in HLS view, the Apple Color Picker, and  the Windows Color dialog box. 
CMYK  colors (top two): process in italics and spot color in plain type; RGB  colors with icon: process (italics) and spot (plain) colors 


 

 
 
 
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