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You can create millions of unique color build combinations with CMYK. Each color can be defined as a percent from 0 to 100. So for example C=25, M=52, Y=89, K=11 would represent the percentages for each of the four process colors. Each color build definition will be treated as a unique color in the color palette, and you can create basically as many as you like. When color separations are made, all the process color build definitions will be reduced to only four separations for press; the process colors Cyan, Magenta, Yellow, and Black.
Screened Color Builds
While color builds provide a vast color selection for all creative artists to use, it does have one limitation that we would like to point out. This has to do with color builds that are screened, or do not contain 100% of Cyan, Magenta, or Black. If the value of a color is less than 100%, a halftone line screen is applied to represent the percentage of color. You can see below, what a screened color might look like.
 
Screened and Unscreened
When screened color builds are applied to type (especially small type, 14pt. and under) or thin stokes (rules) the resulting edge will be fussy or soft looking. The edge will be built entirely from screens with no solid colors to define a crisp edge. Now, if your color build does have at least one of the colors Cyan, Magenta, or Black at 100%, then visually you will have a defined hard edge. Yellow was not mentioned because visually it is difficult to define shape.
How to Make Color Builds
QuarkXPress®
To define your own custom color builds, access the Edit Color dialog box. Simply Name: your color build anything you want, for Model: select CMYK, make sure the Spot Color checkbox is deselected. Then apply the values you want to use in the fields next to C:, M:, Y:, and K:. Press the OK button to add your color to the Colors palette.
Adobe® InDesign®
To make custom color builds, access the New Color Swatch dialog box and select the Name with Color Value check box to have InDesign create a Swatch Name:. If you wish to create your own color name, simply deselect the check box and enter your own unique name. For the Color Type: pop-up menu select Process and for the Color Mode: pop-up menu select CMYK. Enter the Cyan, Magenta, Yellow, and Black values in the appropriate fields, or use the sliders. Press the OK button when your are finished to add your unique color to the Swatches palette.
Mircosoft® Office Publisher®
To change your Accent colors to custom color builds, convert your colors to Process colors (CMYK) and select the Custom tab to apply the nearest process color build equivalents. Microsoft product screen shot(s) reprinted with permission from Microsoft Corporation.
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