Re: [visionlist] Low cost photometer/colorimeter

Dear All,
Mark Georgeson asked about the code for Matlab.
That indeed would be a great thing to achieve; best from inside
Psychophysics Toolbox.
(However, I may be not the best candidate for programming it  since
I use a combination of C programs with OpenGL and Mathematica)
In fact, I use a command-line program (CLP) called Argyll
(, which I found through the Ubuntu help
It worked with our old Spyder 2, and now works with our Spyder 4
elite, but was said to have some trouble with the Spyder 3.
As a CLP, it comes with a 100+ small commands under the hood. Most
of which dedicated to the colour issues, as one would expect from
a colour meter, and only a few for the luminance stuff directly.
It is available for all three systems: Linux, Mac and Windows.
And since it is a command line program, it can be integrated into
and accessed from Matlab.
Or at least I am told that with “! CommandLineCommand foo &” you
can do so.
(As I said, I am not a Matlab pro).
Hence I would greatly appreciate if someone else does it and make
this available.
I would be highly interested !!
For those C-afficionados amongst us:
With …
int status = system(“COMMAND_LINE_COMMAND foo”);

the code would then also be convertible into your (and my)
So, we can start from both sides, Matlab and C !!!
On 23.03.2017 18:55, McCourt, Mark

Right, invariant with distance provided that the source or surface in question completely fills the aperture of the photometer.


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