Since a little while there is one more RAW loading plug-in available for GIMP,
based on the PhotoFlow editor source code (http://photoflowblog.blogspot.com/
The plug-in works pretty much like UFraw, meaning that it gets called when GIMP
tries to open a RAW file, and after the processing it writes back the image
data into the GEGL buffer of a newly created GIMP image. However, the available
functionalities are more complete than UFraw, and it also takes full advantage
of GIMP 2.9 high bit depth capabilities by sending the image data in 32 bits
floating point format.
The PhF plug-in is already available as pre-compiled package for Ubuntu and
derivatives though Thorsten Stettin gimp-edge PPA, and also included in the
latest Windows and OSX GIMP 2.9 installers from Partha.
Of course it can also be compiled from sources, in which case it is recommended
to use the “stable” branch of the GitHub repository
Presently I am working on improving the GIMP-PhF inter-operability. In the
current version of the plug-in, not only the image data is sent to GIMP when
the plug-in is closed, but also the RAW processing configuration. This
configuration is stored as meta-data attached to the background layer created
by the plug-in itself. Also, this meta-data gets stored in the XCF file when
you save it to disk.
The PhF plug-in can be executed again on the same background layer, through the
Filters->Photoflow... menu shortcut. When you do so, instead of processing the
layer itself, the plug-in opens again the RAW file and applies again the
processing parameters as stored in the layer meta-data. The RAW processing can
thus be further tweaked and saved back again in the same background layer.
This functionality is currently only available when compiling the "stable" GIT
branch from sources, and is not yet included in the pre-compiled packages.
The goal is to provide a inter-operability between GIMP and PhF that somewhat
resembles the one between PhotoShop and Lightroom...
Any feedback would be greatly appreciated!
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