Letter-spacing or Tracking
General horizontal space between characters
Called tracking in digital typesetting, refers to a consistent degree of increase or decrease of space between letters to affect density in a line or block of text.
We call those changes "positive or negative spacing".
Letter-spacing refers to the overall spacing of a word or block of text affecting its overall density and texture.
The amount of letter-spacing in text can affect legibility.
Tight letter-spacing, particularly in small text sizes, can diminish legibility.
Added whitespace around the characters allows the individual characters to emerge and be recognized more quickly.
However, addition of space to the point that individual letters become isolated rather than simply easily identifiable destroys legibility and readability.
Page on tracking @ sitepoint
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Kerning
Space between specidic couple of characters
Kerning is a term applied specifically to the spacing adjustment of two particular characters to correct for visually uneven spacing (horizontally).
In a well-kerned font, the two-dimensional blank spaces between each pair of characters all have similar area.
In digital typography, kerning is usually applied to letter pairs as a number by which the default character spacing should be increased or decreased. Reducing the default character spacing is widely used to fit capital letters, such as T, V, W, and Y, closer to some other capital letters on either side (especially A), and to some lower case letters on the right side, such as the combination Ro. It is also used to fit a period (full stop) closer to certain letters (T, V, W, F, y, r).
Auto kerning
Some typographic programs provide an autokerning feature. Autokerning simply takes into account a predefined list of common kerning pairs, and if the outlines of two consecutive glyphs are spaced too far apart, makes a kerning entry. It is rarely a sufficient alternative for manual kerning.
Great page on Kering @ Canva
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Leading
Vertical space between lines
Also called line spacing, refers to the distance between the baselines of successive lines of type (Vertical direction).
The term originated in the days of hand-typesetting, when thin strips of lead were inserted into the forms to increase the vertical distance between lines of type.
The term is still used in modern page layout software such as QuarkXPress and Adobe InDesign.
Create better leading in your typography
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