If you are planning to work on a JPEG over several sessions there are two
things you must do.  

First, never do any resaves to the original file.  Leave it alone and it
can't get degraded by cumulative saves.  Do any saves with a new filename.

Second, the version that you work on should be converted to a lossless
format such as TIFF.  Then, cumulative saving won't incur any degradation.
If it must be compressed it can be converted back to JPEG after all of the
editing is completed.

There are probably more dos and don'ts that I haven't remembered, but these
two are most pertinent to the cumulative loss of quality of JPEGs.

regards,
Anthony Farr 

> -----Original Message-----
> From: Leon Mlakar [mailto:[EMAIL PROTECTED]
> 
> And there's one more thing people tend to forget - each time one opens,
> possibly modifies and saves a JPEG back to the file more of the image data
> gets thrown away. Even with high quality JPEGs these things do accumulate
> ...
> 
> Cheers,
> 
> Leon


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