Re: Color in Safari
Re: Color in Safari
- Subject: Re: Color in Safari
- From: Iliah Borg <email@hidden>
- Date: Sat, 16 Oct 2010 11:26:40 -0400
Here is an image taken with a digital camera through green colour separation filter, Wratten #61
http://g3.img-dpreview.com/37484E0542FD4B9096567EE1468FE687.jpg
As you can see, all channels are exposed. That means all colour filters allow a lot of green. Similar images taken through a separation filter of a different colour show that cross-sensitivity to colours is very significant.
> Hi Graeme,
>
> My model of a digital cameras resembles that of scanners. Perhaps the
> comparison is not really valid but, since scanners use RGB filters that
> themselves limit the range of colors that can be detected by the sensor, I
> thought, naively perhaps, that filter arrays in a digital camera sensor,
> ought to suffer from the same limitation. But I realize that cameras don't
> have gamuts as such. It's an interesting problem. Maybe I can argue that
> most, if not all consumer digital cameras, render to some "form" of sRGB.
> Would that get me off the hook?
>
> Best / Roger
>
>>
>> Hi Roger,
>> cameras don't have gamuts as such. If a particular wavelength is
>> particularly bright, you can just adjust the exposure to bring it within
> the
>> range of values that don't clip. You may be in trouble in _encoding_ all
> colors
>> captured into a particular color space, with a given value as reference
> white
>> though (R=G=B= 100%), and maybe this is what you are referring to.
>>
>> Cameras can have metameric problems - their spectral sensitivities
> probably
>> don't match the standard observer, so there may be spectra that a camera
>> perceives as identical that we can distinguish, and visa-versa.
>>
>> Graeme Gill.
>
>
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Iliah Borg
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