[Digikam-users] re JPEG lossiness, PNG

[Dr. Martin Senftleben]

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Hi all,

I find it interesting that this has become a thread about which format
is the best. It is a question that still bugs me, so thank you for all
your comments! I'm still searching for the best way, but I understand
the best would be to work with the raw images and use them as the
initials. Right. I was always a bit reluctant to work on raws, because
it seemed quite complex, but it doesn't seem to be with digikam.
I took one raw image now and saved it in different formats, without
any changes applied.
The outcome is as follows:
cr2 (original from camera of course): 23.7 MB
jpg (produced by camera): 5.7 MB
jpg (produced by digikam from cr2): 1.6 MB
tif: 51.7 MB (w/o compression, w/ compression it's 27.4 MB)
pgf: 22.8 MB
png: 22.3 MB
jpg2000: 22 MB

pgf is for me out of the question, I had too much trouble with that
format. jpg is lossy, tif quite big (even with compression). Remain
png and jpg2000, where jpg2000 is a format not so well supported.

What puzzles me (is this a bug?) is that none of the tags which I had
saved with the raw file have been taken over by any of the exported
formats. It would be very difficult to create new images from the raw
file and again and again add the tags to the new versions. Only the
description and other exif data were taken over - at least something.

What workflow would be the best to make sure that I have not to repeat
adding tags to the different versions of the same file? Or is there
some setting that I missed which would do the trick?
I could think of: loading raws from the camera, then creating copies
and then starting to tag them etc. But this would only be ok for the
first version I create. As soon as I start to create another version
with some other settings from the raw file, I'll have to redo the
tagging... Another limitation, if I use png as the format to work
with, is that the files are too big for uploading to flickr. This will
always add the step of converting to jpg to the workflow. It's not too
much work, but it's a step that requires some attention and time,
depending on the number of images I want to upload. What if
flickrexport would do the conversion?


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