Is my thinking about equivalence right?

Started 3 months ago | Questions thread
RSTP14 Veteran Member • Posts: 5,038
Re: Is my thinking about equivalence right?

Iliah Borg wrote:

rogerstpierre wrote:

the number of pixels, or data points you may want to call it, defines the size of the image

As any scanner operator worth his salt will tell you, no. The size of the image depends on the number of pixels and output resolution (which, effectively, is the space between the adjacent pixels at the output, or the ratio between the spacing in input to the spacing in output, and that is the magnification).

Absolutely, and a 20Mpix M43 image will print/display the same size as a 20Mpix FF one for any given print/display resolution, so if you want to talk enlargement of the image in a digital world you can not refer to frame (sensor) size but rather to the resolution of the image.

From an enlargement perspective the actual physical size of the sensor is irrelevant and to say that the image captured by a sensor 1/2 the physical size that of another needs be enlarged twice as much to achieve the same viewing size is simply wrong. If that were true, a 20Mpix image captured by an M43 sensor printed at 150dpi would be the same size as a 20Mpix one captured by a FF sensor printed at 300dpi.

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Roger

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