Why does ISO affect storage space?

Discussion in 'Digital Cameras' started by Mike Harris, Jun 18, 2004.

  1. Mike Harris

    Mike Harris Guest

    Can anyone explain why setting a Canon digital camera to a faster ISO
    setting leaves less room available on the CompactFlash card?
    Mike Harris, Jun 18, 2004
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  2. Mike Harris

    Lionel Guest

    Yep. it's because image files (both JPEG & RAW) are compressed formats.
    High ISO images are noisier than low ISO images, & noise is very hard to
    compress, leading to larger files. If the images were stored in an
    uncompressed format, (eg; the most common version of TIFF), they would
    all be the same (huge!) size, regardless of ISO setting.

    Do bear in mind that the "shots remaining" display on most digital
    cameras is only an estimate, as it's obviously not possible for the
    camera to know how big a file is going to be until it's actually been
    shot. So don't be surprised that the number of 'shots remaining' at the
    start will probably be different to the number of shots you actually end
    up with when the card's full.
    Lionel, Jun 18, 2004
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  3. Mike Harris

    Phil Wheeler Guest

    More noise with higher ISO makes the jpeg file larger.

    Phil Wheeler, Jun 18, 2004
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