Digital BW, The Print

Austin Franklin wrote:

>
> Really?  Did he SHOW you any of the supposed 48 inch prints?  The sensor
> that was used in the DPReview camera was a 2k x 2k sensor, and the F7 
> sensor
> is 2268 x 1512, and the F10 sensor is 1280 x 960.  Without interpolation,
> assuming the 2k x 2k sensor, that would make a 48 inch print have only 
> 42.6
> pixels per inch.  I do not believe that.  I can't imagine how he can make
> the claim he has, unless the image was run through something like Genuine
> Fractals...
>

Well, this should lead to some interesting and esoteric marketing battles...

When you are not interpolating color OR edge data, what ratio of  
similarly sized pixels would be needed to achieve the same results with 
a chip that interpolates color on a 1/3 basis (Bayer Pattern), but does 
not interpolate edge values..?

The question comes down to an interesting issue of human visual 
perception.. generally color is less acutely perceived by the eye than 
is edge definition (it's part of our hard-wiring to pick up movement). 
 The question becomes one of  how many mPix on the new three layer chip 
would be equivalent to a 4 mPix Bayer pattern chip... Given our 
pre-wiring for edges I would say it's likely to be need to be well more 
than 1/2 the resolution of the Bayer CCD.

BUT, the debate does not end there.  Because what might not be visibly 
perceptible to us in output of the capture may well create artifacts 
that upon PhotoShop or other processing become intolerable.  Like that 
one orange pixel on a field of denim..  Therefore, it is quite likely 
that FOVEON chip captures may size up even say 3x as well as a Bayer CCD 
capture would (absent extensive filtering).  When you size up 
incorrectly interpolated points they increase in significance within the 
visual field by the simple reality of their increase in finite size.. 
 What might have been an issue of ratio to total image size is now one 
of fixed anomaly size..

[Keith]
 
 

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