Managing image files

Eric Weir eeweir at
Tue Jul 13 21:55:58 EDT 2010

On Jul 13, 2010, at 5:27 PM, Godfrey DiGiorgi wrote:

> Only if YOU maintain an original, unedited copy of the image file, or
> if the image file is a raw file (which Adobe Camera Raw considers to
> be a read-only file).
> - Pixel editors push around the pixels in the file you open with them,
> so any time you open a file and make a change to it, then save, the
> file is no longer as it was and cannot be recovered. That is called
> "destructive editing". Working with raw files differs in that the raw
> conversion plugin considers the original raw file to be read-only so
> it renders a new converted file for editing and leaves the original
> file in place.
> - Lightroom, iPhoto and Aperture all do parametric editing ... the
> original file (raw, JPEG, TIFF, whatever) is saved and read, they
> generate previews to show you what your editing operations are. To
> obtain a new, finished file containing all your edits, you export from
> these three applications new, finished files. The originals are always
> untouched.

Thanks again, Godfrey. I think this answers the questions I asked in my response to your previous post.

Eric Weir
Decatur, GA  USA
eeweir at

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