That's a very useful information - perhaps the problem ist on the side
of Viewer-Applications. Has anyone else a recommendation what works?
About using PNG or TIFF as an alternative: They result in larger image
files than the original RAW.
.RW2: 20MB
.PNG: 25MB
.TIF: 28MB
.JP2: 5.7MB
.JPG: 4.3MB
The JPEGs are converted with 97% Quality in Darktable. For TIF and PNG I
used the 16bit-Variant. Perhaps harddisk-sizes are going to grow faster
than my image pool and in the end I'll stop converting at all and just
keep the RAWs. During my research about the JPEG2000, I found an
interesting text - in German - about file formats here:
http://digicam-experts.de/wissen/1
I also got very good results for tone mapping (aka HDR) single
exposures. But my Software, HDRtist for Mac, supports only low
resolutions in the free version; additionally I am not sure whether it
ignores the .XMPs generated by Darktable. For HDR I think I need a bit
more of practicing. One major downside is that I have no solutions for
batch converting Darktable + HDR-processing up to now.
Andreas
Am 19.10.13 11:35, schrieb Victor L:
I did not find anything working with the EXIF tags of a .jp2 file.
(doesn't mean nothing is working !)
converting RAW-Images to JPEG very often results in visible
deterioration of colors and lighting compared to the RAW (darker areas
appear darker than the RAW was and brighter areas are too bright)
Why not tonemap <https://en.wikipedia.org/wiki/Tonemapping> your
images to a 8 bit JPEG file ?
Also there are other formats that allow you 16 bits output such as
PNG, TIFF, did you try them out ?
Bye
2013/10/14 Andreas Kahl <[email protected]
<mailto:[email protected]>>
Hello Victor,
thank you very much for your hint. After some reading I found
http://www.sno.phy.queensu.ca/~phil/exiftool/exiftool_pod.html#copying_examples
<http://www.sno.phy.queensu.ca/%7Ephil/exiftool/exiftool_pod.html#copying_examples>
Simply copying did not work; what worked partially was*:
1. **exiftool -exif:all= -tagsfromfile @ -all:all -unsafe bad.jpg**
2. ****exiftool -tagsFromFile src.cr2 dst.jpg*
**
After that I could read all the EXIF information from the RAW
(RW2) in the .jp2 with
exiftool image.jp2
Unfortunately I could not find any viewer (for Mac) which could
actually read the newly created EXIF:
- Preview.app displays the same (non-)information as before
- GIMP does not show the information
- ToyViewer does not display any EXIF information
Briefly: I am not sure if the data is written correctly by
exiftool as only exiftool itself can read the information it wrote.
Regards
Andreas
Am 14.10.13 14:05, schrieb Victor L:
Hello,
I think exiftool <http://owl.phy.queensu.ca/%7Ephil/exiftool/>
can do the work but i'm not sure. ExifTool on Wiki
<https://en.wikipedia.org/wiki/ExifTool> says it cannot create
JPEG2000 tags.
Here is an example on how to use it : *exiftool -tagsFromFile
Source.RAW Dest.JPEG*
Hope it helped !
Bye
2013/10/13 Andreas Kahl <[email protected]
<mailto:[email protected]> <mailto:[email protected]
<mailto:[email protected]>>>
Hi there,
converting RAW-Images to JPEG very often results in visible
deterioration of colors and lighting compared to the RAW
(darker areas
appear darker than the RAW was and brighter areas are too
bright). I
suspect this is due to only 8bit color depth in JPEG. To
avoid this I
would like to use JPEG2000, but in Preview.app (Mac) all the
metadata is
missing in the jp2-Files (e.g. information about aperture,
exposure
time, iso, lens,...).
Is there a possiblity to copy this information from the
RAW into a
jp2-file?
Andreas
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Mail: [email protected]
Tel.: +49 (0)176 / 2005 23 73
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