Hi Steven,
back on this subject:
Do you use LZW compression algorithm for TIF from scanning?
Today I was thinking about shrinking my scans from negatives and just
doing that and noticed on a few images from that film roll heavy
artefacts and purple color areas:
http://up.picr.de/20246417kj.jpg
I used the uncompressed file, converted to compressed, imported both to
darktable and just copied the history stack from the uncompressed image
to the compressed one. You see compressed on the left side and
uncompressed on the right.
Perhaps you might check this also.
regards
Bernhard
Steven Fosdick schrieb am 17.11.2014 um 19:18:
Looking at the colours from the negatives they seemed a little odd but
when I got the recently discovered films back from developing complete
with CD scans from the developer these have turned out to have very
different colours from those I get if I scan the same negatives myself.
Here an example:
http://s16.postimg.org/tchwpmfwh/img22highres.jpg
This is the scan that came back from the people developing the film.
http://s16.postimg.org/l5pwy1ptt/img22raw.jpg
This is what I get if I scan the film myself.
I also have an example where water is a very obvious purple.
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