It seems some 25 meg cameras produce 40 meg files in the side by side comparisons. How? s

Started 5 months ago | Questions thread
TAGooty
TAGooty Forum Member • Posts: 96
Re: It seems some 25 meg cameras produce 40 meg files in the side by side comparisons. How? s
2

The file size depends on the image format, JPG or RAW. JPG stores 24 bits per pixel uncompressed. Since JPG in cameras is always highly compressed, the storage required is usually <1 byte per pixel.  I've never see an out-of-camera JPG of >24 MB from a 24 MP camera, though it is theoretically possible.

RAW format stores the direct sensor output which is 12, 14 or 16 bits per pixel, in most modern cameras. Nikon offers lossless compression for NEF (RAW), which reduces the file size to about 60%. Most Sony cameras offer only lossy compression as an alternate to uncompressed for ARW (RAW). When I shoot in RAW, I want maximum quality, so with Sony, I prefer the larger file size of uncompressed.

Some observed file sizes (using extra fine JPG quality):
Nikon D7200:     24 MP, JPG = 10-20 MB, NEF (lossless compression) = 27-29 MB
Sony RX100m6: 20 MP, JPG = 10-18 MB
Sony A7C:           24 MP, JPG = 9-22 MB, ARW (uncompressed) = 47-48 MB
Sony A7R3:         43 MP, JPG = 9-40 MB, ARW (uncompressed) = 82 MB

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