Jpeg File Save & Loss Rate in PSE

When working on jpeg files in the PSE Editor, does PSE perform an automatic internal file "Save" after each adjustment, (i.e., levels, color, etc.)? I have always assumed that the file does not get saved until the user performs a manual save after all editing has been completed.
If automatic internal "saves" are performed after each adjustment on a jpeg file. then image degradation could be accelerated beyond what one would expect, i.e., each Save of a jpeg file reduces image quality. If these automatic Saves are being performed, then I guess the only way to edit files is in a psd format, then save the final psd file to a jpeg format to conserve disk space.

Bob Ward wrote:
When working on jpeg files in the PSE Editor, does PSE perform an automatic internal file "Save" after each adjustment, (i.e., levels, color, etc.)? I have always assumed that the file does not get saved until the user performs a manual save after all editing has been completed.
Yes.
If automatic internal "saves" are performed after each adjustment on a jpeg file. then image degradation could be accelerated beyond what one would expect, i.e., each Save of a jpeg file reduces image quality. If these automatic Saves are being performed, then I guess the only way to edit files is in a psd format, then save the final psd file to a jpeg format to conserve disk space.
No, the 'in memory' format is not saved to the drive unless you manually choose to 'save as'.
If you periodically save a jpeg version (overwriting the older ones), without closing the file, jpeg compression changes are not cumulative. The 'in memory' version is kept unchanged. It's not like you save to jpeg, close and re-open, in which case the jpeg double compression would have taken place.
If you want periodic saves in a long editing session of a picture, it's best to save as psd, because that saves layers, selections... It's also better if you work in 16 bits. If you save in jpeg, the jpeg compression will be done only once, there will be no cumulative loss of quality.

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