gdanmitchell Offline Upload & Sell: Off
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And, {b]don't do that!
First, keep your original raw files separately from the files you work on in Photoshop. While the analogy isn't perfect, they are the equivalent of your negatives back in the film era. You wouldn't throw away your negatives after making a print — don't discard your raw files.
Second, open your raw files into Photoshop as 16-bit images. This retains the best potential for editing that won't create visible degradation in your final files.
Thirds, save your original size Photoshop files with all edits intact (and done in layers, preferably smart layers or adjustment layers) as either .psd (the Photoshop format) or .tif (the tif format). with all layers intact. These will be big files, but that's life. Do not save your photoshop files as jpg!
Fourth, in order to be extra safe — and not lose image data as you do when you go to jpg — whenever you do further editing for print or web presentation or two resize, etc... work on a copy of the original Photoshop file — not the original.
Dan
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