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Re: [OM] Scanner vs. E-10

Subject: Re: [OM] Scanner vs. E-10
From: "Mark Hammons" <astaire@xxxxxxx>
Date: Mon, 16 Jul 2001 09:31:36 -0500
Shouldn't it be that a 4 Megapixel scan is equivalent to a 16 megapixel camera 
and
that an equivalent 3260 x 4472 pixel scan for 35mm would be 14.6 x 4  pixels 
for an
equivalent 58.4 megapixel digital camera??

Mark H.


>
>
> Tom - it's worth saying it again, but pixel counting is hijacked by digital 
> camera marketing
brochures!  For digital cameras they count the total number of photosensitive 
cells in the CCD - and
they are in groups of 4 with one for red, two for green and
> one for blue.  (Don't ask me why - the answer is on the web - somewhere!).  
> For scanners we count
one pixel as being able to represent any colour.  So when you think about a 
4megapixel camera
compare it to a 16megapixel scan...
>
> For a better explanation and loads of experimental examples, see:
http://www.users.qwest.net/~rnclark/scandetail.htm
>
>    And to quote directly from this site: "Film is scanned with each pixel 
> have a red, green and
blue value, so the 3260 x 4472 pixel scan of the 35mm film is 14.6
>    megapixels. But these are not the same as the pixels in a digital camera. 
> In a digital camera,
each pixel is ony a red, or a green, or a blue pixel. Digital cameras have 50 
0reen, 25% blue and
25% red pixels (thus called RGBG). So a 1 megapixel digital
>    camera has 1 million red + green + blue pixels. Thus, the 35mm scan has 
> 14.6 * 3 pixels or 43.8
megapixels in digital camera equivalent pixels. "
>
> So, do we have to buy an E-10 yet?  Yes, for fun, but keep the OM and the 
> scanner for serious
stuff!
> best regds
> jez
>
>
>
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