File size

Started Jan 11, 2013 | Questions thread
sherwoodpete
Veteran MemberPosts: 7,761
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More than 1 byte per pixel
In reply to Philip Kendall, Jan 13, 2013

Philip Kendall wrote:

Because the camera produces more than 1 byte per pixel. There's no real reason the file size when measured in bytes should be correlated to the number of pixels on the sensor at all; it's just a coincidence that they're "close".

Exactly.

There are lots of complications. The sensor data in  the RAW form may take 12 to 14 bits. Each byte can hold 8 bits. In addition, the file usually contains an embedded JPEG image. There may be different types of data compression, or packing, and in some cases padding with extra zeros, which can change the file size.

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