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Author Topic: The Next Chapter in Photographic Lighting  (Read 1461 times)
Ernst Dinkla
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« on: September 29, 2010, 10:32:10 AM »
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It would be nice to see a spectral plot of the new LED lamp.
I mean the CDI 400Watt Multispectral Constant/Flash Light Engine
After searching more pages mentioning the lamp I still am curious about the continuity of the spectral output.

The analogy to an Epson printer using CMYK(RGB) cartridges escapes me. White is paper white there, the color mixing is subtractive to create color and the hues are preferably spectrally separated to get better color mixing, all CMY channels open gives a muddy grey color so is substituted by black ink for better neutrality and Dmax. In contrast the LEDs suffer of spectral spikes and valleys in their output and one has to add different types together to create a better white emission by additive mixing. And/or use fluorescents for the same effect, by that reducing the economy of the LEDs.


met vriendelijke groeten, Ernst Dinkla

Try: http://groups.yahoo.com/group/Wide_Inkjet_Printers/
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ceyman
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« Reply #1 on: October 03, 2010, 11:07:57 AM »
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Thank you Ernst.  I am surprised that there has been no response to your post. 

Mr. Geffert's promotional material on his CDI website states that "this multi-spectral light source can achieve a colorrendering index of over 97 as well as millions of possible color blends." 

I have no idea what that means.  All "white" led's I've familiar with use multiple discrete waveforms to synthesize the color "white" to a not-very-satisfactory degree.  This leaves notable holes in the spectra.  If this light source has solved the problem I'd like to see more technical data in support.

Carl
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Ernst Dinkla
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« Reply #2 on: November 10, 2010, 02:46:23 AM »
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Still no answer.

Will this then be The Next Chapter in Photographic Lighting?:

http://jesserosten.com/2010/ipad-photoshoot

Closed loop color management might be possible that way, first calibrate the displays.  I'm sure Apple will first improve this method before it repairs color management on OS-X. :-)


met vriendelijke groeten, Ernst Dinkla

Dinkla Gallery Canvas Wrap Actions for Photoshop
http://www.pigment-print.com/dinklacanvaswraps/index.html
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