Adobe InCopy CC 2015 - Manual (Page 285)

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Typography
Last updated 6/13/2015
Leading
About leading
This topic refers to how leading is implemented in Roman composition. For information on leading in CJK text, see
About leading in Asian text .
The vertical space between lines of type is called leading. Leading is measured from the baseline of one line of text to
the baseline of the line above it. Baseline is the invisible line on which most letters—that is, those without descenders—
sit.
The default auto-leading option sets the leading at 120% of the type size (for example, 12-point leading for 10-point
type). When auto-leading is in use, InCopy displays the leading value in parentheses in the Leading menu of the
Character panel.
A Leading B Text height C Larger text size of one word increases leading for that one line.
About leading in Asian text
The basis position for leading can be set through the Leading Basis Position setting in the Paragraph panel menu. With
the default setting (Embox Top/Right), the text line leading is measured from the top of its embox to the top of the next
line's embox. By selecting the line and increasing the leading value using the Embox top/Right setting, the space
between the selected line and the next line will grow, because the direction leading is measured from the current line
to the next line. All other Leading Basis Position settings measure leading from the current line to the previous line, so
changing the leading amount with those settings will increase the line aki above the current line.
Set leading from Leading in the Character panel or Control panel. This is set to Automatic by default. When Auto
Leading is set, the leading value is displayed in parentheses in Leading in the Character panel. This Automatic value
varies for text frames and text in frame grids. The Automatic Leading value can be set from the Justification menu item
in the Paragraph panel. The default setting for the automatic leading value for text in text frames in InCopy is 175% of
the set font size. For text in frame grids, it is 100%, which allows for the grid alignment to spread out the lines of the
text in the grid.