The Sigma cameras with Foveon chips are getting an anecdotal reputation of
having difficulty with color fidelity.
----- Original Message -----
From: "Arthur Entlich" <artistic-1@shaw.ca>
To: <karlsch@verizon.net>
Sent: Friday, September 12, 2003 3:20 PM
Subject: [filmscanners] Re: Why DSLR ouput looks sharper?
I just took a look at the image you directed me to. But I didn't stop
there, because without a comparison it doesn't mean a lot. Is the
defect due to the jpegging, is it the limit of a digital sensor, or the
resolution? I couldn't tell. So I went to another digital review site
www.imaging-resource.com, and I used the "Comparometer", and took a look
at the image of the house and the musicians, both which contain numerous
angular lines within them.
I used the Canon D30, since it has a similar resolution, and I was
unable to see anything drastically difference between them in terms of
this particular defect. I was somewhat surprised by the red/green color
"fringing" on the Sigma, however, but that may have more to do with the
lens, or even the software.
If you can show me an A:B comparison of a camera of similar resolution
that shows this problem clearly, I'm all eyes.
BTW, I am not stating that your are wrong, you may well be correct. It
is just that without having a comparison of another image technology to
compare it to, I cannot identify that the probelm is unique to the
Foveon chip.
Art
David J. Littleboy wrote:
> "Arthur Entlich" <artistic-1@shaw.ca> wrote:
>
>>The Foveon technology looks interesting, but their current implementation
>>doesn't have any diffuser over the sensor, which makes it appear sharper
>>than most competitive sensors, but it is prone to aliasing and moire.
>
>
> I've only seen samples on the web (some full file size) but I seem to
> recall seeing more aliasing with the CCD/bayer interpolation pattern
> than with the Foveon.
>
>
>
>
> Look closely at just about any close to horizontal or vertical line, e.g.
> the white border around the ONE WAY sign. (Diagonals seem to survive (see
> the finer wires) but the fat wires are a jaggy mess (those are jaggies,
not
> twisted pair cables).) At first glance there seems to be a lot of detail,
> but it's all aliasing artifacts.
>
> David J. Littleboy
> davidjl@gol.com
> Tokyo, Japan
>
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