EXCERPT page containing first few paragraphs. 2019-03-21 14:15:23
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This example taken from the fruit ISO series.
Noise and degree of enlargement
Too often the degree of enlargement is forgotten when discussing noise.
A 36-megapixel image needs considerably less enlargement for the same size print because of higher pixel density; it is not per-pixel noise that matters but in essence, noise per area. Hence a discussion of “noise” that drops the context of print size (reproduction size) is meaningless.'
Taking an analogy: “I rode my bike 10 today”. Ten miles, ten kilometers, ten feet? Obviously units are required for distance, and for noise, the degree of enlargement is needed. A discussion dropping that context shows a fundamental failure in reasoning.
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