Choosing a type size
- In Photoshop, the default unit of measurement for type is points. One PostScript point is equal to 1/72 of an inch in a 72-ppi image; however, you can switch between using the PostScript and traditional definitions of point size. You can change the default unit of measurement for type in the Units & Rulers area of the Preferences dialog box.
- In ImageReady, pixels are the only unit of measurement for type. This is because the ImageReady application is tailored to creating images for online viewing, in which pixels are the standard unit of measurement.
The type size determines how large the type appears in the image:
To choose a type size:
In the Character palette or options bar, enter or select a new value for Size 
. In Photoshop, to use an alternate unit of measurement, enter the unit (in, cm, mm, pt, px, or pica) after the value in the Size text box. The value you enter is converted to the default unit of measurement.
To specify the default unit of measurement for type (Photoshop):
- Do one of the following:
- In Windows, choose Edit > Preferences > Units & Rulers.
- In Mac OS, choose Photoshop > Preferences > Units & Rulers.
- Select a unit of measurement for Type.
To specify the point size definition (Photoshop):
- Do one of the following:
- In Windows, choose Edit > Preferences > Units & Rulers.
- In Mac OS, choose Photoshop > Preferences > Units & Rulers.
- Select an option for Point/Pica Size. Traditional points are slightly smaller than PostScript points.