Re: Spectral sensivities
Re: Spectral sensivities
- Subject: Re: Spectral sensivities
- From: edmund ronald <email@hidden>
- Date: Tue, 15 Mar 2016 19:21:12 +0100
sin 4
On Tuesday, March 15, 2016, Ben Goren <email@hidden> wrote:
> On Mar 15, 2016, at 9:39 AM, Roger Breton <email@hidden
> <javascript:;>> wrote:
>
> > Is there a (simple) way to get at a particular camera sensors spectral
> sensitivities?
>
> Simplest is to get it from somebody else.
>
> Cheap is to build your own large-sized spectroscope, photograph a
> spectrum, and combine it with various other measurements and math and
> what-not. I still need to type up and post instructions and plans and
> what-not. But the basic idea is that if you know the SPD reaching the
> sensor (which is a product of the illuminant and the efficiencies of
> everything between the illuminant and the sensor -- presumably, just the
> diffraction grating and the lens) then you can treat the rainbow image as a
> standard chart image to get your RGB values. Assuming the sensor is linear
> (a good assumption if your capture technique is impeccable), that's your
> spectral sensitivity.
>
> Cheers,
>
> b&
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