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Question on Spectral Sensitivity Curves


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#1 Nathan D. Lee

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Posted 07 June 2006 - 07:13 PM

The answer to this may be right in front of my face but comparing the curves between Kodak v2 500T and Fuji Eterna 500T shows that Kodak has values for Red Green and Blue, but Fuji has values for Magenta, Cyan, and yellow.
Could someone clarify why these are different? I know that RGB are the primary colors of light and CMY is that of pigment but I thought in negative film it would be the same.

Kodak: http://www.kodak.com....4.4.16.4&lc=en

Fuji: http://www.fujifilm....NA500_curve.pdf

Again the answer may be right in the open, but any knowledge on the subject would be great.

Nathan
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#2 Clive Tobin

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Posted 07 June 2006 - 11:19 PM

The answer to this may be right in front of my face but comparing the curves between Kodak v2 500T and Fuji Eterna 500T shows that Kodak has values for Red Green and Blue, but Fuji has values for Magenta, Cyan, and yellow. ...


Blue light exposure controls the amount of yellow dye. Green light controls the amount of magenta dye. Red light controls the amount of cyan dye. So it is all just a matter of how you think about it.
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#3 Nathan D. Lee

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Posted 08 June 2006 - 12:37 AM

Ah Ha! That makes perfect sense! That is why the curves are so similar. One is referring to the light hitting the film and the other is referring to the dye layer in the film! Thank you, that answered my question.

Nathan
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#4 John Pytlak RIP

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Posted 08 June 2006 - 10:06 AM

Evidently, different labeling conventions were used. Kodak labeled the curves as being the spectral sensitivities for the yellow, magenta and cyan layers, which are respectively sensitized to blue, green, and red portions of the spectrum. Fuji chose to label the curves blue, green and red.
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