dorky bit depth question

Discussion in 'Photography Beginners' Forum' started by kkamin, Dec 13, 2009.

  1. kkamin

    kkamin TPF Noob!

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    I learned that a pure black and white image (just 2 shades: solid black 0,0,0 and solid white 255,255,255) is a one-bit image, because the pixel can either be black or white.

    When you move to gray scale channels, you have 8-bits per pixel. Each pixel can be 256 shades of gray. Why does the number come out to 8 for the bit depth? Is that how many binary numbers it takes to produce an integer between 0-255?
     
  2. Bitter Jeweler

    Bitter Jeweler Been spending a lot of time on here!

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    Yes.
     
  3. dxqcanada

    dxqcanada Been spending a lot of time on here!

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    2 to the power of 8 = 256 (0 - 255)
     
  4. kkamin

    kkamin TPF Noob!

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    so smart! :thumbup: Thanks to both replies.

    What about the Pro Photo color space, I guess it is 16-bits per channel. How many shades of gray are there per channel? I've never worked in that color space before.
     

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