Question about Canon PowerShot SD790 IS/ IXUS 90 IS Digital Camera

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When trying to view my photos, some of the photos will show incompatible JPEG. How do I fix this?

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  • kakima Jul 14, 2010

    Is this on the camera or an a computer? If a comptuer, what program are you using to view the photos?

  • hhilbert3 Jul 14, 2010

    On the camera.

  • kakima Jul 14, 2010

    Were the pictures taken by this same camera? Many cameras will not show photos taken by different cameras, nor show photos that have been edited on a computer (and opening a JPEG file and saving it counts as "editing").

    How long has it been since the card was formatted? If you've been shooting and erasing photos on the card without formatting, that is almost guaranteed to lead to problems.

    Can you put the card into a card reader and try to look at the photos on a computer?

  • hhilbert3 Jul 15, 2010

    I can read all of the photos on a computer. The problem is only on the camera. I didnt know you had to format a card. Can you tell me what that is. I have been shoot and erasing from the same card.

  • kakima Jul 15, 2010

    In effect a memory card is simply another hard disk (albeit without any moving parts). By erasing photos (or files) individually and putting new ones on, the new ones could get scattered into multiple locations on the card, instead of being in one contiguous stretch. The process is called "fragmentation." Not only can this lead to the card acting slower, it can cause other problems. Formatting clears the slate completely so that files can be laid down in contiguous sectors. Make sure you do this on the camera, not the computer.

    If the photos are fine on the computer AND you really want them on the camera as well, do this. After making sure the desired photos are on the computer, format the card in the camera. Put the card back in a card reader and copy the desired photos from the computer to the card. Make sure you put them into the appropriate folder. This will only work  if you haven't done ANY editing of the photos (opening it and saving it as is counts as editing).

  • hhilbert3 Jul 15, 2010

    Thank you!! That worked



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Glad to be of service.

Posted on Jul 15, 2010


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