Page 31 - CC2018_ID_Look_Inside

ChAnge Color vAlues
Although there are several default color choices built into the Swatches panel of every
InDesign file, you are not limited to these few options. You can define virtually any
color based on specific values of component colors.
When you are building a page to be printed, you should use CMYK colors.
The CMYK color model, also called process color, uses subtractive color theory to
reproduce the range of printable colors by overlapping semi-transparent layers of cyan,
magenta, yellow, and black inks in varying percentages from 0–100.
In process-color printing, these four colors of ink are imaged (or separated) onto
individual printing plates. Each color separation is printed with a separate unit of a
printing press. When printed on top of each other in varying percentages, the semi-
transparent inks produce the CMYK gamut, or the range of possible colors. Special
(spot) colors can also be included in a job by using specifically formulated inks as
additional color separations.

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Using theoretically pure pigments, a mixture of equal parts of cyan, magenta, and
yellow should produce black. Real pigments, however,
are not pure; the actual result of mixing these three colors
usually appears as a muddy brown. In the image to the
right, the left block is printed with 100% black ink. The
right block is a combination of 100% cyan, 100%
magenta, and 100% yellow inks.
The fourth color, black (K), is added to the three subtractive primaries to extend
the range of printable colors and to allow much purer blacks to be printed than is
possible with only the three primaries. Black is abbreviated as “K” because it is the
“key” color to which others are aligned on the printing press. Using K for black also
avoids confusion with blue in the RGB color model, which is used for jobs that will be
distributed digitally (websites, some PDF files, etc.).

1. With gcm-letterhead.indd open, use the Selection tool to make sure the
shape at the bottom of the page is selected.
Every shape you create in an InDesign document has a bounding box, which is a
non-printing rectangle that marks the outer dimensions of the shape. (Even a circle
has a square bounding box, marking the largest height and width of the object.) The
bounding box has eight handles, which you can drag to change the size of the rectangle.
If you can see an object’s bounding box handles, that object is selected.

2. Click the button at the right end of the Control panel to open the panel
Options menu.

Project 1: Letterhead Design 41