[thelist] Undo in Photoshop

Matt mspiegler at lightbulbpress.com
Tue May 21 14:26:01 CDT 2002

And yet isn't that what the History panel does? I'm curious, whats the
difference between clicking control-Z 6 times, vs. clicking 6 lines up in the
History palette?

John Dowdell wrote:

> It's a little harder for a pixel-editing programs, because many actions are
> actually one-way operations upon large collections of data.
> For example, how would you un-do a blur? If you perform the corresponding
> sharpen you're actually doing two discrete operations, and the resulting
> data will almost certainly differ from the original data.
> A pixel-processing program is different from a word-processing program or
> vector-drawing program. That's why the History Panel there saves your
> preferred number of previous states on disk, and reverts to a stored state
> when desired.
> jd
> John Dowdell, Macromedia Developer Support, San Francisco
> (Best to reply on-list, to avoid my mighty spam filters!)
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