Thanks to both of you. I like Lorenzo's approach, because it seems very
pragmatic and I don't mind doing some shell scripting.
I watched Bruce's video (https://www.youtube.com/watch?v=OF23NWCTepw)
and checked the previous email discussion on various ways to get a
monochromatic image
(https://www.mail-archive.com/[email protected]/msg03786.html).
That made me think whether it's possible to come up with a complete list
of modules that support monochrome output in one way or another. So,
here is my list summarizing some ways that have been mentioned before,
and even a few more, sorted from "seems obvious" to "pretty obscure". :-)
- monochrome: on
- contrast brightness saturation: saturation -1
- color correction: saturation -1
- color zones: all nodes in saturation tab curve set to zero
- channel mixer: various settings
- color balance: input saturation 0% or output saturation 0%
- filmic: saturation 0%
- color look up table: preset
- low light vision: all nodes in curve set to zero, blue shift 0%
- soften: size 0%, saturation 0%, mix 100%
- colorize: saturation 0, source mix 100%
- vignetting: saturation -1, scale 0%, fall-off strength 0%
On 3/15/19 12:33 AM, Lorenzo Bolzani wrote:
Of course, but maybe it is good enough for Mark. There are many ways to
get a monochrome image but I suspect most user just go for the simplest one.
And he can extend this to the other modules he may have used to convert
the image, manually removing tags from the false positives if necessary.
Or just cover 90% of the images and do the rest manually.
Exactly. Personally, I mostly use the monochrome and color zones module,
so I know what to look for in *my* image collection.
I do not see many alternatives anyway: you could inspect the exported
images but it takes much more work (unless imagemagick can do the trick)
and a few assumptions about the export folder for example.
Yes, thought about that, too. This "analytic" approach, looking directly
at the final image, would probably be more robust (given a good enough
definition of "monochrome image"). The drawback when you use an external
tool like ImageMagick is that you need to have *all* processed images
exported to disk. I usually only export subsets.
In my opinion the best solution would be implemented in darktable
directly, analyzing the final image content by some criteria with
configurable thresholds. Unfortunately, this also seems to be the
solution with highest effort. So, I will try, what you, Lorenzo,
suggested. Thanks again.
Mark
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