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Author Topic: "When 20 megapixels is really 50 megapixels" By Jim Chung - Crops %  (Read 1674 times)

Guillermo Luijk

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In 'When 20 megapixels is really 50 megapixels', Jim Chung shows several 50Mpx vs 20Mpx images one on one, but he doesn't explain the % of crop we are seeing. Since both images are the same size, at least one of them has been rescaled. I guess the left 50Mpx image is a 100% crop and the right 20Mpx image has been upscaled to fit the size, but the article mentions nothing.

https://luminous-landscape.com/when-20-megapixels-is-really-50-megapixels-by-jim-chung/

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LesterGilbert

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Bill Claff has been publishing authoritative, alternate dynamic range charts for a while now.  The Olympus high resolution results (HR, hand-held HR, and with computational ND filter) are shown at https://www.photonstophotos.net/Charts/PDR_HighResShotMode.htm

                                             PDR
Olympus OM-D E-M1X              9.72
Olympus OM-D E-M1X(HR)       11.65
Olympus OM-D E-M1X(HHHR)   11.54   

Olympus System OM-1               9.54
Olympus System OM-1(HR)        11.53
Olympus System OM-1(LND64)   12.01   

For comparison, the chart for all brands is at https://www.photonstophotos.net/Charts/PDR.htm  For example, the Nikon Z9 gives

Nikon Z 9               11.30
Nikon Z 9(DX)         10.49
« Last Edit: May 23, 2022, 05:07:18 am by LesterGilbert »
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