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<blockquote data-quote="WayneF" data-source="post: 442751" data-attributes="member: 12496">True, raw files are never modified, but OP did not mention raw.Yes, Adobe stuff that uses ACR (Adobe Camera Raw... Lightroom, PSE, PS), uses the same method for JPG or TIF as for raw.&nbsp; Meaning that, assuming NOT using the regular File- Save or Save As menu, and instead using the ACR procedures, then the original is always faithfully retained unmodified, and only the change list is saved.Repeat:Edit normally in PSE or PS, and selecting File - Save or Save As -&nbsp; DOES rewrite the data, and the original is NOT kept (unless file name is changed in Save As).But edit in ACR (which can be JPG too), and save its way, and the original is retained, and a list of edit changes are saved.&nbsp; Howver, this then means you have to output a new JPG or TIF file to actually incorporate those changes.&nbsp; Other programs viewing it will see only the original data, so ACR has to output a new changed JPG copy for other programs to see. But this is only one additional new set of JPG artifacts added.This is called Lossless Editing, meaning nondestructive, recoverable.</blockquote>

[QUOTE="WayneF, post: 442751, member: 12496"] True, raw files are never modified, but OP did not mention raw. Yes, Adobe stuff that uses ACR (Adobe Camera Raw... Lightroom, PSE, PS), uses the same method for JPG or TIF as for raw. Meaning that, assuming NOT using the regular File- Save or Save As menu, and instead using the ACR procedures, then the original is always faithfully retained unmodified, and only the change list is saved. Repeat: Edit normally in PSE or PS, and selecting File - Save or Save As - DOES rewrite the data, and the original is NOT kept (unless file name is changed in Save As). But edit in ACR (which can be JPG too), and save its way, and the original is retained, and a list of edit changes are saved. Howver, this then means you have to output a new JPG or TIF file to actually incorporate those changes. Other programs viewing it will see only the original data, so ACR has to output a new changed JPG copy for other programs to see. But this is only one additional new set of JPG artifacts added. This is called Lossless Editing, meaning nondestructive, recoverable. [/QUOTE]

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