are expressions useful?
by stanly boon on Jul 17, 2011 at 5:08:38 pm
my work is prety dull. now for instance i divide a long video to layers and aply a pre made treatment to every layer. i ask my self , can expresions speed up my work? i been ready alittle on the subject and it seem to me it is an interesting subject , but erelavant to my working life. am i wrong? is it worth the effort for me to learn this subject? thanx
Re: are expressions useful? by Greg Burrus on Jul 17, 2011 at 5:54:34 pm
I would say expressions are indeed useful, especially for tasks that are dull or repetitive. I'm sure you could make or there might be one already that divides layers by markers and splits them. There is one already that I use that uses markers to render out still frames.
Depending on your how much your into it, it might be worth learning or at least gain an understanding enough to customize expressions. If you don't feel the urge to learn you can check out sites like http://aescripts.com/ that make use of expressions and other AE scripts to improve your workflow.
An expression is a little piece of software—much like a script—that evaluates to a single value for a single layer property at a specific point in time. Whereas scripts tell an application to do something, an expression says that a property is something.
Expressions are evaluated for every single frame that the layer is active, so they must return a value for all values of time (like a function in math).
In other words, expressions let you do things you could also do with keyframes; scripts let you do things you could otherwise do with the AE UI.
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