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Please explain "downsizing"....


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"RE: Please explain "downsizing"...."

ericbowles Moderator Awarded for his in-depth knowledge and high level skills in various areas, especially Landscape and Wildlife Photoghraphy Writer Ribbon awarded for for his article contributions to the community Donor Ribbon awarded for his very generous support to the Fundraising Campaign 2015 Nikonian since 25th Nov 2005
Thu 09-Feb-12 02:36 PM

What that is really referring to is applying high megapixels to a print or a standard output size.

You can make the dots of ink smaller, in which case noise becomes insignificant. But printers already have their limits and your optimum remains 260-300 dpi.

So instead you would "downsize" the image - combining 3 pixels of a 36 MP image into a single pixel for rendering in a normal print. This means that noise is a small amount of the result, and virtually disappears.

DxO uses a standard size print to evaluate all the different cameras with different sensor sizes. That print size is 30x20cm or approximately 12x8 inches.

You could pick an alternative size - 30x20 inches inf you wanted. That requires upsizing. That would mean that each pixel of a D3 needs to be converted to 2 pixels - and any noise would result in twice as much noise.

You would not be throwing anything away - just evaluating based on a common output. But if you want to compare images from two FX cameras, the idea is you should compare the same size print from both rather than a much larger print on a camera with more pixels.

Eric Bowles
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A general, generic topic Please explain "downsizing".... [View all] , hollingwD80 , Thu 09-Feb-12 01:20 PM
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