[Gimp-developer] Introducing the PhotoFlow GIMP plug-in

[aferrero1975 <aferrero1975 gmail com>]

Since a little while there is one more RAW loading plug-in available for
GIMP, based on the  PhotoFlow editor <http://photoflowblog.blogspot.com>  
source code.

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
<https://github.com/aferrero2707/PhotoFlow/tree/stable>   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.

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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