Now so far you may have heard me bandy about an unfamiliar word and now I need to tell you what it means. The word is parametric and where more multilayered compositions are concerned, it's the most beautiful word you've ever heard. Now I know it sounds a little techy, but here's the deal. A parametric operation is one that relies on parameters. In other words, I might change a numerical value or I might select an option from a pop-up menu or I might click on a check box, but later I could change that number or select a different option or turn off the check box. So everything I do is undoable.
Not in a conventional sense, where I choose the Undo command immediately after applying a setting, but anytime, ages later, whenever I want to. It's all a matter of changing a setting. And that's just the beginning. In this chapter I'll show you how to set layers to interact with each other in ways that are forever changeable. In the same way you presently take for granted that you can change a word in a line of e-mail, you can change the essential appearance of a layer. Here's how.
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