> Carlos wrote:
>
>
> Being non-spectral is not an issue... but colour perception is a very
> complex matter, especially when dealing with electronic devices, which
> usually behave much differently than the eyes!
>
> For a start, the usual RGB model is severely mismatched to the eyes'
> response: the short cones have their sensitivity peak at around 430 nm,
> which is not blue, but _violet_. The 'green' cones are OK, at 540 nm...
> but
> the long cones peak at 572 nm, which is GREENISH-YELLOW -- nowhere near
> to
> red!!!
>
Very interesting, I've been pondering this stuff recently, I hadn't realised
that the eye isn't very sensitive in the red part of the spectrum.
>
> Some films (e.g. Agfa Vista) have tried to mimic this response by
> shifting
> the red response towards the green. This renders the film almost useless
> for
> astrophotogaphy, where the eye's already poor response to Hydrogen-alpha
> line (656 nm) is most desired -- emission nebulae.
>
So how does/did Vista work for "normal" subjects (landscapes, portraits) ?
I would think that it would make sense to have a film/sensor mimic the response
of the human eye.
...Wayne
Wayne Harridge
http://lrh.structuregraphs.com
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