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Old Jan 24, 2008, 9:02 AM   #1
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First off, Steve's Digicams is a simply awesome website!! I've used it for years to evaluate cameras for purchase.

Camera makers make claims that a given camera captures 7 megapixels or 7 "effective" megapixels, or something like that, when it actually has the resolution of a 3 Mpx camera. How can we calculaute exactly how many pixels the camera captures?

I know that you can't get something for nothin'.

My Fuji S2 gets 6.7 Mpx or something like that. My little Canon Powershot S70 claims 7.1 Mpx, which I know is a lie.

Is there some kind of standard for these statements? If not, there should be!
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Old Jan 24, 2008, 12:08 PM   #2
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"My little Canon Powershot S70 claims 7.1 Mpx, which I know is a lie."

How do you know that?

the Hun


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Old Jan 24, 2008, 2:46 PM   #3
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Lionel Stevenson wrote:
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My Fuji S2 gets 6.7 Mpx or something like that. My little Canon Powershot S70 claims 7.1 Mpx, which I know is a lie.
You know that how? Here's the specs:





Image Capture Device

Type: 1/1.8 inch type Charge-Coupled Device (CCD)


Total Pixels: Approx. 7.4 Million

Effective Pixels: Approx. 7.1 Million


The difference between Total and Effective is because of frame format requirements not all of the photo sites on the sensor are actively used.

The actual pixels from the table below are:







[align=center]Menu Selection=Large/SuperFine, File Size (KB)=3045, Resolution=3072x2304
(pixels)[/b][/align]


3072x2304=707888 pixels or ~7.1 MP and from the perspective ofthe user this is correct. Fuji, Canon, Olympus and the rest using Bayer filtered sensors use essentially the same methodology to come up with their advertising number.

The gotcha is that the term megapixel, use to describe a sensor is inaccurate. The correct terminology should mega-photosites, that is instead of being called 6.7 or 7.1 megapixel they should be called mega-photosite. It is an interpolation process that creates 7.1 MP out of 7.1 mega-photosites. For an overveiw see the links below.

http://tomberarducci.1000nerds.kodak...sp?item=503453

http://tomberarducci.1000nerds.kodak...sp?item=555502

http://1000nerds.kodak.com/search/de...sp?item=665417
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