The em is a unit of measurement in the printing and typesetting industry. Its primary purpose is to indicate the height of a given typeface, usually expressed in points. One em is equal to the point size of the given typeface.
The em has been used in printing and typesetting for centuries and continues to be an important unit of measurement in the industry. The em is used to determine the leading (the space between lines of text), the measure (the width of a column of text), and the size of margins. In addition, the em is often used to indicate the size of various elements within a design, such as the width of rule lines, the size of photo margins, and the like.
While the em is still an important unit of measurement in the printing and typesetting industry, it has been largely replaced by the pixel in digital design. This is due to the fact that the pixel is a more precise unit of measurement than the em.
Em is a measure of the width of a column of text. It is traditionally defined as the width of the capital M in the typeface and size being used. In digital typefaces, the width of the Em can be defined in terms of pixels, points, or as a percentage of the width of the typeface.
The Em is an important unit of measurement in printing, as it allows for consistent and accurate margins and column widths. When setting type, it is important to consider the width of the Em in order to ensure that the text will fit on the page and that the margins will be of the correct size.
The importance of em as it pertains to printing is that it is a unit of measurement in the field of typography. In printing, em refers to the width of a column of text, and is used to ensure that text is properly aligned on a page. Additionally, em is also used to measure the size of typefaces, as well as the spacing between characters. By understanding and utilizing em, printers are able to produce high-quality print products that are both aesthetically pleasing and easy to read.