See Also: Readability – An Arc90 Lab Experiment
Defining a page’s number of columns and the gutter’s width between them is called a page grid:
Optimal line lengths often defined the typeface’s point size meaning that, it is optimal to have about 50-70 characters per line. So, you need to use the appropriate point size of type to achieve this balance:
Leading is the distance of points from the baseline of one line of type to the baseline of the next line of type:
The name leading comes from the days of movable type when you literally needed to add lead to increase the distance between lines. Some word processing programs may refer to this as line spacing to avoid lead poisoning.
When using headlines and/or sub-headings that are a different type size than your body copy, it is typical to use “space-before” and “space-after” in the style definition for “headline:”
Justification is the process of filling lines of a given measure with type. Every line of type is justified either left, right, centered (with the remaining space filled out to the edge of the margins) or forced (where the space is distributed between the words on the line of text to push the text out to both left and right margins).
Hyphenation is the means of allowing words to be broken into fragments to better fill out the line of type to look appropriate:
You can set Hyphenation & Justification within the text editing or layout program for how you would like it to act: with or without hyphenation and justified either left (ragged-right), right, center or forced.
In theory, when your measures or columns are wide enough, just about any type setting or word processing will be able to create evenly-spaced words (and good color) over the entire page, versus narrowly spaced measures and columns.
Allowing word spaces and hyphenation to be flexible by your program will allow for a tighter rag. This is easier to read in narrow measures and columns:
Overly tightly spaced words lend for poor readability much more than nice loosely spaced words:
Kerning and tracking adjustments are calibrated in the same units, usually thousandths of an em, but are actually quite different. Kerning targets and adjusts the spaces between specific letter pairs:
Kerning is done automatically in most cases due to the built in kerning tables of the given font being used. However, not all fonts have kerning tables so kerning must be done by hand.
Tracking targets and adjusts the spacing between letters over the whole line of type and is frequently used to tighten or loosen the overall letter/word spacing of that line of text.