Sergey Po
Вот честно скажу, меня мало интересовал этот вопрос, всегда у меня выставлено 20. И такое объяснение, которое дано выше, приводиться в русскоязычных уроках.
Так что давай разбираться вместе, мне аж самому стало интересно
Вот смотри оригинал хелпа:
Цитата:
Correcting mistakes
You can use the Undo command to correct mistakes you make while using the Adobe Illustrator program. You can even undo an operation after you choose the Save command (but not if you closed and then reopened the file). If an operation cannot be undone, the Undo command is dimmed.
Depending on how much memory is available, you can undo an unlimited number of the last operations you performed, in reverse order, by repeatedly choosing the Undo command. The Illustrator performance is usually not affected by the number of undo levels you choose; however, if you are trying to display complex artwork, you may receive a message asking you to reduce the number of undo levels because of insufficient memory.
You can also revert a file to the version that was last saved (but not if you closed and then reopened the file).
To undo or redo an operation:
Choose Edit > Undo or Edit > Redo. (Depending on the memory available to your system, you can choose Undo an unlimited number of times.)
To change the minimum number of undo levels:
1. Choose Edit > Preferences > Units & Undo (Windows and Mac OS 9) or Illustrator > Preferences > Units & Undo (Mac OS X).
2. Enter a value for Minimum Undo Levels, and click OK. The default undo level is 5.
To revert a file to the last saved version:
Choose File > Revert. You cannot undo this action.
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Насколько я понял, это количество той оперативной памяти, которая отводится под сохранение откатов.
