Photoshop路径的运算顺序对路径组合的影响分析
上次课我们讲了Photoshop路径的运算模式(参考《用Photoshop路径当“超级积木”组合造型》),通过运算我们可以在一个形状上加上另一个形状,也可以让它们相减或者交叉运算,得到新的形状。本文中我们讲一讲Photoshop路径的运算顺序对路径组合结果的影响。
上次课我们讲了Photoshop路径的运算模式(参考《用Photoshop路径当“超级积木”组合造型》),通过运算我们可以在一个形状上加上另一个形状,也可以让它们相减或者交叉运算,得到新的形状。本文中我们讲一讲Photoshop路径的运算顺序对路径组合结果的影响。
先给朋友们出个小小的题目:朋友打斗地主,甲先出,手中有一张大鬼,一对7,一张3;乙后出,手中有两张2。问甲怎么出牌会胜。
常打牌的朋友会说,一定是先出一张3,利用大鬼破拆对手的对2啦!
是呀,这就是出牌顺序决定了胜负的一个小例子。同样的,我们可以将此思维运用在路径运算之中,使用相同的路径、相同的运算模式,而不同的运算顺序则得到不同的运算结果。
图1是一只小熊头像的一部分,图1最左侧是参与运算的路径,图1中间是使用先加后减的顺序运算得到的结果,图1右侧是使用先减后加的顺序运算得到的结果。可以在耳朵部分看出它们的明显区别。
图1
我们首先将路径全都建立起来,并设置好它们各自的运算属性。为了明确各条路径,方便后面的讲解,我们为它们先编上号。
两只耳朵都是由外圆和内圆组成,外圆我们称1号路径,两侧各有一条,将它们设置为“添加到路径区域”模式;内圆我们称2号路径,两侧各有一条,将它们设置为“从路径区域减去”模式;脑壳部分由两条圆形路径组成,外圆为3号路径,设置为“添加到路径区域”模式;内圆为4号路径,设置为“从路径区域减去”模式;下巴和脑壳相似,外圆为5号路径,设置为“添加到路径区域”模式;内圆为6号路径,设置为“从路径区域减去”模式。
设置完之后,如图2所示,它和我们要的结果相差甚大。想做成什么样子,要看我们运算的顺序了。
图2
高手加油站:使用路径选择工具选择多条路径的技巧
按着Shift键,依次单击各条路径,可以多选几条路径;使用路径选择工具框选,可以将框选时经过的路径全部选择;选择多条路径,按着Shift键单击已被选择的某条路径,可以将它取消选择。
我们使用先加后减的顺序试验一下,我们使用路径选择工具选择1、3、5号路径,它们构成了整个图像的外形,单击属性栏上的“组合”按钮,可以看到,形状图层立即就变成了图1中间的样式。然后再用路径选择工具框选所有路径,再次进行组合,就将所有的路径合成为一条路径。
我们再使用先减后加的顺序试验一下,按着Shift键,将1、2号路径选择,将它们组合。此时耳朵成为一条整体路径。然后选择它,按Shift键单击3、5号路径,再次组合,最后框选所有路径整体组合,就可以做出图1中右侧图的效果。
为什么会出现这些差异呢?这是因为先加后减的过程中,我们先把外形组合在一起,然后统一剪掉内部区域,形成耳朵与头部相连的效果。而在先减后加的过程中,我们先将耳朵内部区域剪掉,后来再加上头部时,一部分被剪掉的区域又被加了回来,所以得到不同的运算结果。

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