the despill operation is placed after the processed foreground and before the comp node, as shown in figure 5-11.
在图5-11,我们可看到溢出处理环节被安排在前景预处理环节后,合成节点前。
with the processed foreground method, the foreground layer is already 「scaled」 and we do not want to scale it again in the comp node.
在使用前景预处理方法时,由于前景层已经被缩放过,我们不需要再次用合成节点对它进行缩放。
although the processed foreground method has the advantage of softer edges, it also has its problems and limitations.
尽管使用前景预处理方法得到的边缘会更柔和,但这项优势仍不能掩饰它存在的问题和局限性。