* Michael Below <[email protected]> [11-03-18 16:19]: > Hi, > > Am Samstag, den 03.11.2018, 19:11 +0100 schrieb Stéphane Gourichon: > > Applying the principle of least surprise invites me to suggest an > > idea: defaulting to roughly same image file weight. > > # Idea, with details > > So, how about implementing, like GIMP does, an option like this: > > > > [✔] Use quality settings from original image (when available) > > I agree abot the principle, but I think file size is not the relevant > point when talking about images. > > For me, the main point is that darktable preserves the image quality of > an input image as far as possible, even when it is in a lossy format > like JPEG.
your responsibility, adjust the quality/compression XX%. > The idea of re-using quantisation tables can make sense, I am not a > programmer. But re-using the "quality settings" as presented to the > user seems a bad idea. The numbers on the JPEG quality scale are not > standardized. One program's "70" may be another program's "90" and so > on. So (possibly) downgrading an image of higher quality until it meets > darktable's JPEG quality numbering scheme would be a bad idea, at least > as a default. This would be a surprise for me. > > On the other hand, there may be a neat way to calculate the necessary > quality of a JPEG for the given information content of an imported > file. So darktable could determine that a darktable-specific setting of > "83" is required to transport all the valid information from an input > file that has been saved in another program with a setting of "70" or > "90" (according to that program's scale). This would be a fine way to > deal with the file size issue mentioned earlier (but even then, it may > be considered surprising if darktable did this by default). but what is "valid" in your mind is not the same as in mine or others. the mentioned "file size issue" was more due to the OP not knowing about the setting and it's purpose. -- (paka)Patrick Shanahan Plainfield, Indiana, USA @ptilopteri http://en.opensuse.org openSUSE Community Member facebook/ptilopteri Registered Linux User #207535 @ http://linuxcounter.net Photos: http://wahoo.no-ip.org/piwigo paka @ IRCnet freenode ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
