Bonjour, If you open a jpeg photo in darktable, you can modify it (exposition, contrast, etc.). As far as I understand the way dt works, the jpeg file is not modified but all changes are recorded in the xmp file and a new jpeg file is created when you export your photo at the end of the treatment (am I right?).
So my question is: is there some loss when I export the photo to a jpeg file after treatment with dt and is there a cumulative loss of quality if I reopen the original jpeg with dt (not the exported one) in order to add or modify some module actions? What is the best strategy to work with dt on jpeg photos? Work directly with the jpeg format or convert this one to another lossless format (using imagemagick for instance) and work with this format before exporting to the jpeg format? I expect that what I say is enough understandable.... Thank you. -- François Patte UFR de mathématiques et informatique Laboratoire CNRS MAP5, UMR 8145 Université Paris Descartes 45, rue des Saints Pères F-75270 Paris Cedex 06 Tél. +33 (0)6 7892 5822 http://www.math-info.univ-paris5.fr/~patte
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