phototypesetting, an attempt was made to use millimeters as a b sic unit for type measurement, but it was never taken up.
Type size, as shown in the diagram, is determined by the size of the type body (which, in the past, was a piece of movable metal) rather than by the actual letter. Nowadays, the body can be considered as the distance between the top of the highest part of the letterform (usually an ascender) to the bottom of the lowest (a descended), plus a notional amount of clearance, which varies from typeface to typeface.
The typographer's point is approximately 0.3 mm or l/72 inch. Such a very small unit is necessary when describing very small sizes of type. However, attempting to express large measurement in points is cumbersome, so a larger unit of 12 pt, the pica em, is used. In many programs, it is possible to select pica ems or picas as a unit of measurement, for example, horizontal measurement for setting column widths. In practice, digital graphic designers will probably find themselves working in several measurement systems- points for type, millimeters for area or page size, and inches for scanning resolu6ons (dpi).
The em (without the pica) is a measurement notionally based on the width of a capital M. Therefore, the value of the em is the same as the point size being used. Units of digital letter spacing and character construction are based on dividing the em of the given type size (be it 8 pt or 24 pt) into hundredths or thousandths-infinitely more subtle than in earlier times
Above: Digital graphic designers often find themselves working with several measurement systems points for type, millimeters for page size, centimeters as a familiar unit for sizing graphic elements, and inches for image resolutions (dpi)., Fortunately, the software can convert effortlessly between all of these.
phototypesetting, an attempt was made to use millimeters as a b sic unit for type measurement, but it was never taken up.
Type size, as shown in the diagram, is determined by the size of the type body (which, in the past, was a piece of movable metal) rather than by the actual letter. Nowadays, the body can be considered as the distance between the top of the highest part of the letterform (usually an ascender) to the bottom of the lowest (a descended), plus a notional amount of clearance, which varies from typeface to typeface.
The typographer's point is approximately 0.3 mm or l/72 inch. Such a very small unit is necessary when describing very small sizes of type. However, attempting to express large measurement in points is cumbersome, so a larger unit of 12 pt, the pica em, is used. In many programs, it is possible to select pica ems or picas as a unit of measurement, for example, horizontal measurement for setting column widths. In practice, digital graphic designers will probably find themselves working in several measurement systems- points for type, millimeters for area or page size, and inches for scanning resolu6ons (dpi).
The em (without the pica) is a measurement notionally based on the width of a capital M. Therefore, the value of the em is the same as the point size being used. Units of digital letter spacing and character construction are based on dividing the em of the given type size (be it 8 pt or 24 pt) into hundredths or thousandths-infinitely more subtle than in earlier times
Above: Digital graphic designers often find themselves working with several measurement systems points for type, millimeters for page size, centimeters as a familiar unit for sizing graphic elements, and inches for image resolutions (dpi)., Fortunately, the software can convert effortlessly between all of these.
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