How much memory is needed to store a black and white photo with resolution 1024×512 if we use 32 gray levels?

July 10, 2009 by admin · 2 Comments
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ms c asked:


How much memory is needed to store a black and white photo with resolution 1024×512 if we use 32 gray levels?

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2 Responses to “How much memory is needed to store a black and white photo with resolution 1024×512 if we use 32 gray levels?”
  1. Ted DeadMan says:
    July 14, 2009 at 1:06 pm

    There are several answers to this question depending on what you are doing:

    With no compression (like a bitmap):

    1024 x 512 x 8 bits = 410 k or so, I assume a few bits for brightness

    If you use compression then it depends on the type and agressiveness and whether it is lossy. Wild guess at a typical JPEG would be 40 k, really depends on complexity of picture and how much lossy you can tolerate

  2. billrussell42 says:
    July 17, 2009 at 11:22 am

    32 gray levels takes 5 bits.
    5 bits x 1024 x 512 = 2621440 bits
    2621440 bits / 8 = 327680 bytes

    in real life you would use a byte per pixel and waste the 3 bits, so then that is 1024 x 512 bytes or 524288 bytes.

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