Hallo Alexandre,
do you know this software: http://lrtimelapse.com/
I've been following some of Gunther's tutorials and also
reading his e-book.
He says that in the name lr-timelaps the first two letters
are representing "level" and "ramp", not "lightroom", even
if this is the base program of all operations. lrtimelaps
reads the xmp information from Adobe Lightroom and modifies
them to get those deflickering and day-to-night ramps correct.
From my understanding you
* want to read the information within the xmp files of a
large series of shots
* modify them in a way to get smooth appearance
(deflickering from one image to the next and
day-to-night/brightness ramps over many pictures) with
some scripts you wrote for this purpose
* write the modified information back to the xmp files
* have darktable process them to export jpg files as a
base for
* putting them together to a film in some external software
For this you need a "converter" to translate the xmp files
of darktable - as they are - to and from a format you can
work with.
(I write this to verify that I - and hopefully others who
are familiar with those things - get the "job description"
right)
If this would work -*would be a GREAT extension of darktable
*and for photo editing in linux altogether!
(Another example of "deflickering" - not everyone is
familiar with that: http://www.youtube.com/watch?v=lpWiNTxouOk)
Sorry, I'm not a programmer either - but I like to look at
concepts and hope to be of help with my comments.
-Bernhard-
Alexandre Jullien schrieb am 25.08.2013 12:51:
Hello everybody,
I have a project for a long time : combine the power of
darktable with small scripts i've made to export frames
for my timelapses.
Let me explain a little bit:
With the timelapse photography you can encounter some
problems with fast brightness transitions (flickering). Or
you may want to adjust some parameters differently at the
nightfall transition for example (a tuning for daylight,
another tuning for the night). In this case, a smooth
tuning transition is required to have a natural rendering
(like in video).
That's why I've developed some scripts to do these jobs
but with "convert" cli-tool, operating on JPG only. My
goal is to do the same with darktable thanks to the
darktable-cli, or directly indarktable just by modifying
.XMP files externally.
To do this I just need 2 things:
1. one way to convert .XMP file in "readable" format to
get all filters and their parameters defined thanks
darktable (blendop params if i've well understood the code).
For example, convert .XMP in a file like this (with
information like in darktable GUI):
...
Exposition
Brightness = +0.3
Darkness = 0.0
White Balance
Tone = 1.0
Temperature = 6500
...
2. The opposite function : transform a "readable" file
(defined in 1.) into a XMP file for darktable.
It could be just one button to export/import this kind of
"readable" file in darktable.
Or a self-content little binary in CLI converting XMP in
readable file or readable file in XMP.
Is somebody interesting in this project ?
Could somebody help me to do this ?
(I have no knowledge to compile/set environment of
development, but I can modify/understand code).
He would have my eternal consideration :-) !
examples of some of my timelapses:
Sunset
with flikering:
http://www.youtube.com/watch?v=ndWmV1mZhUE
after filtering with my scripts:
http://www.youtube.com/watch?v=VLov-Jhn3TM
Daylight
http://www.youtube.com/watch?v=Bl9G-1oGiGI
Alexandre (Toulouse (31) / France)
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