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<p>[QUOTE=&quot;-jeffB, post: 2503586, member: 27832&quot;]It helps me understand what you&#039;re saying, but I can&#039;t see how it can possibly work. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" /></p><p><br /></p><p>Spectroscopy relies on detecting differences in light that&#039;s reflected, transmitted, emitted or absorbed, according to its wavelengths (color). A spectroscope can distinguish hundreds or thousands of millions of different wavelengths; by seeing how their brightness compares, you can learn something about the material that you&#039;re examining.</p><p><br /></p><p>The problem with a photo, no matter how good your camera, is that it muddles all these different wavelengths into three bins -- red, green, and blue -- and just records how much light falls into each bin for each pixel in the image. It doesn&#039;t record detailed wavelength information at all.</p><p><br /></p><p>Trying to do spectroscopy from a DSLR image would be like trying to time a footrace with a sundial. I just don&#039;t see any way that you can get the information you need out of a photo. The best you can get out of your spectrometer, no matter how sophisticated it is, is a measurement of your display&#039;s red, green, and blue emission spectra, weighted according to how bright each of those three channels is at the pixel you&#039;re examining.[/QUOTE]</p><p><br /></p>

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