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Dear All,<br>
<br>
Mark Georgeson asked about the code for Matlab.<br>
That indeed would be a great thing to achieve; best from inside
Psychophysics Toolbox.<br>
(However, I may be not the best candidate for programming it since
I use a combination of C programs with OpenGL and Mathematica)<br>
<br>
In fact, I use a command-line program (CLP) called Argyll
(<a class="moz-txt-link-freetext" href="http://www.argyllcms.com/">http://www.argyllcms.com/</a>), which I found through the Ubuntu help
pages.<br>
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.<br>
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 <br>
a colour meter, and only a few for the luminance stuff directly.<br>
<br>
It is available for all three systems: Linux, Mac and Windows.<br>
And since it is a command line program, it can be integrated into
and accessed from Matlab.<br>
Or at least I am told that with "! CommandLineCommand foo &" you
can do so.<br>
(As I said, I am not a Matlab pro).<br>
<br>
Hence I would greatly appreciate if someone else does it and make
this available.<br>
I would be highly interested !!<br>
<br>
For those C-afficionados amongst us:<br>
With ...<br>
<pre class="default prettyprint prettyprinted" style=""><code><span class="com"> #include</span><span class="pln"> </span><span class="str"><stdlib.h></span><span class="pln">
</span><span class="kwd"> int</span><span class="pln"> status </span><span class="pun">=</span><span class="pln"> system</span><span class="pun">(</span><span class="str">"COMMAND_LINE_COMMAND foo"</span><span class="pun">);</span></code></pre>
the code would then also be convertible into your (and my)
C-Programs.<br>
<br>
So, we can start from both sides, Matlab and C !!!<br>
<br>
<br>
Cheers,<br>
farid<br>
<br>
<br>
<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 23.03.2017 18:55, McCourt, Mark
wrote:<br>
</div>
<blockquote
cite="mid:CY4PR08MB247003A1A16C7E2312E84826E63F0@CY4PR08MB2470.namprd08.prod.outlook.com"
type="cite">
<pre wrap="">Right, invariant with distance provided that the source or surface in question completely fills the aperture of the photometer.
-----Original Message-----
From: visionlist [<a class="moz-txt-link-freetext" href="mailto:visionlist-bounces@visionscience.com">mailto:visionlist-bounces@visionscience.com</a>] On Behalf Of Jeff Mulligan
Sent: Thursday, March 23, 2017 11:07 AM
To: <a class="moz-txt-link-abbreviated" href="mailto:visionlist@visionscience.com">visionlist@visionscience.com</a>
Subject: Re: [visionlist] Low cost photometer/colorimeter
On 3/23/17 8:13 AM, Georgeson, Mark A wrote:
</pre>
<blockquote type="cite">
<pre wrap="">
Comment: since luminance is invariant with distance, it shouldn't
matter in principle what distance the meter is at.
</pre>
</blockquote>
<pre wrap="">
insert "for extended sources"---------------------^
True enough for full-field displays, but maybe not for single pixels.
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</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Dr. Farid I. Kandil
Wiss. Mitarbeiter
Dipl.-Psychologe
Universitätsklinikum Hamburg-Eppendorf (UKE)
Institut für Computational Neuroscience
Martinistraße 52
20246 Hamburg
Geb. W36 / Raum 104
Tel +49 (0)40 7410-57166
Lab +49 (0)40 7410-59828
Fax +49 (0)40 7410-54882
Email <a class="moz-txt-link-abbreviated" href="mailto:f.kandil@uke.de">f.kandil@uke.de</a>
</pre>
<br>
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