.tif files versus .jpg files

Discussion in 'Photoshop' started by victory, Jan 18, 2004.

  1. victory

    victory Guest

    As a relative newcomer to PS , ( I have PS7 ) , I understand that , if
    you want to avoid losses when making adjustments to a photo image file
    , one way of ensuring this is to save these files in .tif form as
    opposed to the .jpg form which my digital camera automatically does.

    I've just saved one of my .jpg files as a .tif file .

    This has increased the size of this file from 1147 KB to 9231 KB.
    Is this increase in size normal when this change of format is effected
    ?

    B.N.
     
    victory, Jan 18, 2004
    #1
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  2. victory

    Voivod Guest

    Yes, TIFF is an uncompressed format, JPEG is a compressed format.
     
    Voivod, Jan 18, 2004
    #2
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  3. victory

    victory Guest

    Thanks for the prompt reply.

    Is it then OK to do things like rotate the image and otherwise mess
    about with an image in this .tiff format without losing any of the
    original detail unlike similar operations with a .jpg image ?

    I realise , of course , that , if you want to avoid losses with .jpg
    formats , you can always use copies of the originals.

    B.N.
     
    victory, Jan 18, 2004
    #3
  4. victory

    Voivod Guest

    For the most part, yes. Since TIFF is a lossless format there
    should be no loss of image quality which you pay for in image
    size.
    If you need a JPEG copy do all of your manipulation on the
    TIFF (or PSD) file then save a copy or use save for web
    which gives you greater control over the compression.
     
    Voivod, Jan 18, 2004
    #4
  5. victory

    edjh Guest

    Tiff can be saved with LZW compression, which is lossless.
     
    edjh, Jan 18, 2004
    #5
  6. victory

    pioe[rmv] Guest

    Yes, you can, but if the file has once been compressed with .jpg, the
    loss has already happened. You can never bring the information back. You
    can only avoid further loss, but it cannot substitute an original TIFF
    file. You should always scan or record your images in RAW or TIFF, never
    in .jpg.
    Yes, it is normal.

    Per Inge Oestmoen
     
    pioe[rmv], Jan 19, 2004
    #6
  7. victory

    misifus Guest

    In jpeg, the loss occurs when saving the file. Manipulation
    doesn't cause the losses. Jpeg artifacts become more noticeable
    after several generations of saves. If your camera saves the
    original image in .jpg, and you open it, manipulate it and then
    save it again in .jpg, you have increased the losses. If you
    then re-open the saved .jpg, and perform further work with the
    image, and re-save, you will have further increased the losses
    and the jpeg artifacts which will be visible.

    -Raf
     
    misifus, Jan 22, 2004
    #7
  8. victory

    Stephen A. Guest

    Is this true with the new JPG2000 format?
     
    Stephen A., Jan 22, 2004
    #8
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