行距

在字体排印学，行距（Leading）指代字体连续行的基线间的距离。这个词起源于手工排版的年代，铅字之间通过插入铅块来增加垂直距离。这个术语仍然被应用于如 QuarkXPress（英语：QuarkXPress）、Adobe InDesign 等现代化的版面设计软件。在以消费者为导向的文字排版软件中，这个概念通常指的是“line spacing”或“interline spacing”。这个词来自于铅（Lead）。当印刷机中的排版是以人工完成的时候，或厚或薄的铅块被插入到行与行之间来增加垂直距离，填满页面上的可用空间。设置为“solid”（没有行距）的文本看起来很拥挤，字符的升部几乎接触到前一行的降部。行间缺乏白色空隙使得眼睛难以追踪每一行文字，川流更明显，降低了可读性。尽管行距通常恒定不变，但偶尔亦需要调整。例如，西文中没有降部的行与没有升部的行之间的距离一般小于普通行距。下面这段文字的行距为为默认值Typography (Greek: typos "form", graphein "to write") is the art and technique of setting written subject matter in type using a combination of typeface styles, point sizes, line lengths, line leading, character spacing, and word spacing to produce typeset artwork in physical or digital form.下面这段文字的行距设置为50%，更易阅读Typography (Greek: typos "form", graphein "to write") is the art and technique of setting written subject matter in type using a combination of typeface styles, point sizes, line lengths, line leading, character spacing, and word spacing to produce typeset artwork in physical or digital form.下面这段文字的行距设置为100%，仍然易于阅读，但是降低了页面垂直空间的使用性Typography (Greek: typos "form", graphein "to write") is the art and technique of setting written subject matter in type using a combination of typeface styles, point sizes, line lengths, line leading, character spacing, and word spacing to produce typeset artwork in physical or digital form.