«

'CCD cells do not detect color. Today, most cameras have CCD chips
that are covered by
a mosaic mask which provides each cell either a red, green or blue
filter. . After the image is collected, a color and brightness value
is assigned for each pixel which is interpolated from local clusters
of cells. While camera manufacturer's marketing departments report
the
CCD as having 5+ megapixels this is an overstatement of the
information content..

There are other systems in which the CCD or a special color filiter is
shifted by piezo- electric devices to facilitate collecting the three
different images which are then combined. The best cameras have three
different 5+ megapixel chips, one for each color filter with a special
lens that directs part of the incomming light to each chip. These
two designs carry astronomical price tags. .

Only recently has a new X3 chip come to market which has three
extremely thin layers of cells. This chip has the capacity to provide
full color and resolution. Right now it is available in very high end
SLR cameras, but I think it will come to other imaging systems.

See http://gaiatec.com/am03/Lyon1.pdf

Numerical analysis of visual censors in the eye is just a starting
point., That analysis does not lead to the most useful conclusions
about human abilities to recognize details. The brain is what
actually "sees" in the sense that the image is "constructed" within
the brain from a number of scans, each of which adds more information.
The eye is only a sophisticated pickup. The brain directs the eye to
shift and refocus over the region of interest. Details are integrated
over time. We seem to sense the regions of special interest and
concentrate on these details.'


Note that the X3 chip is now available in 'very high end SLR cameras'.
We of this group already know this, of course. He speaks of the Sigma
SD-9 and SD-10.

"Independent Sigma Evaluator" <> wrote in message
news...
> 'CCD cells do not detect color. Today, most cameras have CCD chips
> that are covered by
> a mosaic mask which provides each cell either a red, green or blue
> filter. . After the image is collected, a color and brightness value
> is assigned for each pixel which is interpolated from local clusters
> of cells. While camera manufacturer's marketing departments report
> the
> CCD as having 5+ megapixels this is an overstatement of the
> information content..
>
> There are other systems in which the CCD or a special color filiter is
> shifted by piezo- electric devices to facilitate collecting the three
> different images which are then combined. The best cameras have three
> different 5+ megapixel chips, one for each color filter with a special
> lens that directs part of the incomming light to each chip. These
> two designs carry astronomical price tags. .
>
> Only recently has a new X3 chip come to market which has three
> extremely thin layers of cells. This chip has the capacity to provide
> full color and resolution. Right now it is available in very high end
> SLR cameras, but I think it will come to other imaging systems.
>
> See http://gaiatec.com/am03/Lyon1.pdf
>
> Numerical analysis of visual censors in the eye is just a starting
> point., That analysis does not lead to the most useful conclusions
> about human abilities to recognize details. The brain is what
> actually "sees" in the sense that the image is "constructed" within
> the brain from a number of scans, each of which adds more information.
> The eye is only a sophisticated pickup. The brain directs the eye to
> shift and refocus over the region of interest. Details are integrated
> over time. We seem to sense the regions of special interest and
> concentrate on these details.'
>
>
> Note that the X3 chip is now available in 'very high end SLR cameras'.
> We of this group already know this, of course. He speaks of the Sigma
> SD-9 and SD-10.
>
Other postings, especially in this NG, have been critical of the quality of
the pictures from the Sigma cameras with the Foveon sensors. For now, it
isn't a happy solution for your application.

On Thu, 25 Dec 2003 10:46:29 -0500, "Marvin Margoshes"
<> wrote:

>
>"Independent Sigma Evaluator" <> wrote in message
>news.. .
>> 'CCD cells do not detect color. Today, most cameras have CCD chips
>> that are covered by
>> a mosaic mask which provides each cell either a red, green or blue
>> filter. . After the image is collected, a color and brightness value
>> is assigned for each pixel which is interpolated from local clusters
>> of cells. While camera manufacturer's marketing departments report
>> the
>> CCD as having 5+ megapixels this is an overstatement of the
>> information content..
>>
>> There are other systems in which the CCD or a special color filiter is
>> shifted by piezo- electric devices to facilitate collecting the three
>> different images which are then combined. The best cameras have three
>> different 5+ megapixel chips, one for each color filter with a special
>> lens that directs part of the incomming light to each chip. These
>> two designs carry astronomical price tags. .
>>
>> Only recently has a new X3 chip come to market which has three
>> extremely thin layers of cells. This chip has the capacity to provide
>> full color and resolution. Right now it is available in very high end
>> SLR cameras, but I think it will come to other imaging systems.
>>
>> See http://gaiatec.com/am03/Lyon1.pdf
>>
>> Numerical analysis of visual censors in the eye is just a starting
>> point., That analysis does not lead to the most useful conclusions
>> about human abilities to recognize details. The brain is what
>> actually "sees" in the sense that the image is "constructed" within
>> the brain from a number of scans, each of which adds more information.
>> The eye is only a sophisticated pickup. The brain directs the eye to
>> shift and refocus over the region of interest. Details are integrated
>> over time. We seem to sense the regions of special interest and
>> concentrate on these details.'
>>
>>
>> Note that the X3 chip is now available in 'very high end SLR cameras'.
>> We of this group already know this, of course. He speaks of the Sigma
>> SD-9 and SD-10.
>>
>Other postings, especially in this NG, have been critical of the quality of
>the pictures from the Sigma cameras with the Foveon sensors. For now, it
>isn't a happy solution for your application.


Actually, it's not a bad prospect for microscopy. Specimens are
usually colour-stained, and colour filters are often placed in the
light path, so colour accuracy is simply what the operator decides he
wants it to be. The SD cameras have the major advantage of a mirror
lockup facility, all metering modes are available in manual modes, and
the supposd drawback of the SA Mount is easily overcome by using
Pentax-K adapters on the microscope tube. They do fit the SA mount.

A POS is a POS and the Sigma is a POS. George -- give it up. No one is
going to ride your hobby horse with you.

--
http://www.chapelhillnoir.com
home of The Camera-ist's Manifesto
The Improved Links Pages are at
http://www.chapelhillnoir.com/links/mlinks00.html
A sample chapter from my novel "Haight-Ashbury" is at
http://www.chapelhillnoir.com/writ/hait/hatitl.html
"Independent Sigma Evaluator" <> wrote in message
news...
> 'CCD cells do not detect color. Today, most cameras have CCD chips
> that are covered by
> a mosaic mask which provides each cell either a red, green or blue
> filter. . After the image is collected, a color and brightness value
> is assigned for each pixel which is interpolated from local clusters
> of cells. While camera manufacturer's marketing departments report
> the
> CCD as having 5+ megapixels this is an overstatement of the
> information content..
>
> There are other systems in which the CCD or a special color filiter is
> shifted by piezo- electric devices to facilitate collecting the three
> different images which are then combined. The best cameras have three
> different 5+ megapixel chips, one for each color filter with a special
> lens that directs part of the incomming light to each chip. These
> two designs carry astronomical price tags. .
>
> Only recently has a new X3 chip come to market which has three
> extremely thin layers of cells. This chip has the capacity to provide
> full color and resolution. Right now it is available in very high end
> SLR cameras, but I think it will come to other imaging systems.
>
> See http://gaiatec.com/am03/Lyon1.pdf
>
> Numerical analysis of visual censors in the eye is just a starting
> point., That analysis does not lead to the most useful conclusions
> about human abilities to recognize details. The brain is what
> actually "sees" in the sense that the image is "constructed" within
> the brain from a number of scans, each of which adds more information.
> The eye is only a sophisticated pickup. The brain directs the eye to
> shift and refocus over the region of interest. Details are integrated
> over time. We seem to sense the regions of special interest and
> concentrate on these details.'
>
>
> Note that the X3 chip is now available in 'very high end SLR cameras'.
> We of this group already know this, of course. He speaks of the Sigma
> SD-9 and SD-10.
>

Independent Sigma Evaluator wrote:
>

>
> Note that the X3 chip is now available in 'very high end SLR cameras'.
> We of this group already know this, of course. He speaks of the Sigma
> SD-9 and SD-10.

But the X3 chip isn't available in any high end cameras, only in Sigma
cameras. Kind of makes you question the veracity of the whole post.

Lisa