Digital BW, The Print

The Minolta RD175 used three CCDs with a prism to split the light from the 
lens, in the same way that 3-CCD video cameras do it.

However the narrow cone of light that the prism accepted meant that all 
lenses were restricted to f/6.9 or smaller irrespective of their normal 
maximum aperture.

On Saturday 19 Jan 2002 6:53 pm, Austin Franklin wrote:
> Hi Tim,
>
> I haven't really thought about that.  Obviously, you'd have to do color
> space conversion.  I remember a web article that outlined using CMYK, but
> it really doesn't give any detailed explanation:
>
> http://www.digitalcameras.com/howTheyWork2.asp
>
> I wish I knew more...and it is an interesting question.  I have a friend
> who is designing some consumer level digicams, and I'm sure he has people
> who work with him who could possibly answer that question, so I'll ask him.
>
> If you find out anything, I'd like to know!  What I would do, is make a
> filter/lense that is a quad prism that takes ALL the info for that 2x2 area
> and gives it to each sensor...that way there is NO interpolating, and you
> have TRUE color information...but then you get 1/4th the number of "pixels"
> (I use that term loosely here ;-) that the cameras that use interpolation,
> give you.used three CCDs with a prism to split the light form the lens, in 
the same way that 3-CCD video cameras do it.

However the prism meant that

On Saturday 19 Jan 2002 6:53 pm, Austin Franklin wrote:
> Hi Tim,
>
> I haven't really thought about that.  Obviously, you'd have to do color
> space conversion.  I remember a web article that outlined using CMYK, but
> it really doesn't give any detailed explanation:
>
> http://www.digitalcameras.com/howTheyWork2.asp
>
> I wish I knew more...and it is an interesting question.  I have a friend
> who is designing some consumer level digicams, and I'm sure he has people
> who work with him who could possibly answer that question, so I'll ask him.
>
> If you find out anything, I'd like to know!  What I would do, is make a
> filter/lense that is a quad prism that takes ALL the info for that 2x2 area
> and gives it to each sensor...that way there is NO interpolating, and you
> have TRUE color information...but then you get 1/4th the number of "pixels"
> (I use that term loosely here ;-) that the cameras that use interpolation,
> give you.
>
> Regards,
>
> Austin
>
> > -----Original Message-----
> > From: Tim Spragens [mailto:t.spragens@...]
> > Sent: Saturday, January 19, 2002 1:32 PM
> > To: dIgitalblackandwhitetheprint@yahoogroups.com
> > Subject: RE: [Digital BW] Shooting Digitally, for Austin
> >
> >
> > Austin,
> >
> > can you explain why more companies aren't using CMYK filters instead
> > of RGBG for single-chip cameras? Seems like there would be less light
> > loss, and it would avoid the redundant G.
> >
> > Tim
> >
> > > The other issue that comes into play, is these one shot cameras aren't
> > > really true pixels...they interpolate the color data, which makes them
> > > really require 4x the number of sensors to give you TRUE color data.
> >
> > --
> > Tim Spragens
> > http://www.borderless-photos.com
> > &
> > http://www.borderless-photos.de
>
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