You can use the colour picker on the left side in the darkroom mode.

Jason

On 16-03-11 10:39 AM, Johann Spies wrote:
I am working through an online photography course and for the present
module I have to construct a zone ruler using software which a
densitometer capability.

My problem is that I work on Linux and I do not know about software that
is capable of doing just that on a Linux platform.  The course material
recommended

Adobe Photoshop
Adobe Lightroom
Adobe Photoshop Elements
Apple’s Aperture
Nikon View NX
Macintosh’s Digital Color Meter

Is there a function in Darktable which can give me the RGB readings of
photographs of a grey card on arbitrary spots in the photo?

Regards
Johann
--
Because experiencing your loyal love is better than life itself,
my lips will praise you.  (Psalm 63:3)

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