Re: Spectral sensivities
Re: Spectral sensivities
- Subject: Re: Spectral sensivities
- From: Iliah Borg <email@hidden>
- Date: Tue, 15 Mar 2016 15:20:40 -0400
I guess Edmund means “Cosine Fourth” Law for Falloff.
On Mar 15, 2016, at 3:03 PM, Roger Breton wrote:
> "sin 4", is that "Sinar 4"? Some kind of Sinar software, Edmund?
>
> / Roger
>
> -----Original Message-----
> From: colorsync-users-bounces+graxx=email@hidden [mailto:colorsync-users-bounces+graxx=email@hidden] On Behalf Of edmund ronald
> Sent: 15 mars 2016 14:21
> To: Ben Goren <email@hidden>
> Cc: ColorSync <email@hidden>
> Subject: Re: Spectral sensivities
>
> 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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--
Best regards,
Iliah Borg
LibRaw, LLC
www.libraw.org
www.rawdigger.com
www.fastrawviewer.com
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