The existing collection options for ISO, aperture, etc., have always been
completely useless to me because the form of a Darktable collection query
effectively restricts these options to queries on exact values -- one
cannot make queries such as "ISO greater than 400."

I assume there is no straightforward way of establishing the same kind of
scripting structure for collection options as exists now for lighttable
modules? This would certainly make it easier to support collection options
that have limited use cases, without having to overpopulate the list in
everyone's collection module.

August Schwerdfeger

On Sat, Aug 5, 2017 at 2:39 AM, Marcial Gómez Martín <>

> I use to take pictures of paintings and other stuff in order to catalogue
> and archive them. I prepare a set and shoot five times for every item and
> five more with a color chart, keeping the aperture fixed and changing the
> time. Then, I look at all the images and look for the one with the correct
> exposure (after making a proper icc profile for the session following the
> amazing Elle Stone's methods). Once I have processed this one image, I
> intend to copy paste the history to the rest "with the same exposure time",
> and I have to navigate the lighttable with the mouse to select them among
> hundreds one by one.
> Yes, the ability to collect them by exposure time would be great for me.
> I dont' know if I am the only person who finds it useful. There are other
> criteria which I don't use, but I understand they might be useful for other
> people and, as you can choose, on the side of the camera, from "focal
> length", "ISO", "aperture" and "lens", I think that adding the option
> "exposure time" wouldn't be a crazy thing to consider. On the other hand, I
> may be wrong, but I think that adding this wouldn't be a nightmare for the
> developers (of course, I am not one of them and respect their job and their
> priorities: I'm sure there might be  other much more important things).
> Thanks.
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