Confusing File sizes

Discussion in 'Photoshop Tutorials' started by Glenis, Feb 17, 2007.

  1. Glenis

    Glenis Guest

    I opened the same JPG image in 3 different graphics apps and saved it
    in various formats.
    Here's what I found:

    Original JPG size: 1033kb

    Photoshop CS2
    Saved as PNG. Size: 2102kb
    Saved as TIFF. Size: 5648kb

    Photoshop 7
    Saved as PNG. Size: 2226kb
    Saved as TIFF. Size: 7485kb

    Paint Shop Pro 8
    Saved as PNG. Size: 2207kb
    Saved as TIFF. Size: 5627kb

    All PNGs were saved as non-interlaced & non-optimized
    All TIFFs were saved as uncompressed

    Could someone explain this
     
    Glenis, Feb 17, 2007
    #1
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  2. Glenis

    tacit Guest

    Looks like one of the TIFs was saved with layers.

    Also, Photoshop will, unless you specify otherwise, save files with
    embedded thumbnails, previews, and embedded color profiles. This will
    make the file size slightly bigger.
     
    tacit, Feb 17, 2007
    #2
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  3. Glenis

    Glenis Guest

    That's the odd thing. I simply opened the the same JPG file in each app
    and then saved it to a different format
     
    Glenis, Feb 18, 2007
    #3
  4. Glenis

    tacit Guest

    Correct.

    By default, if you just install different apps and leave the preferences
    untouched, they will do different things.

    Photoshop, by default, will save a thumbnail, a preview, and a color
    profile in every file you save. Open a file and save it again in
    Photoshop, and if it did not have those things to begin with, it will.
    Hence, its size will increase slightly.

    By default, if you save a layered file in Photoshop, then it will also
    save a composite, flattened copy of the file, increasing its size.

    Hence, it pays to look at and understand the preferences of your
    graphics apps, and to understand which options are appropriate for your
    needs.
     
    tacit, Feb 18, 2007
    #4
  5. Glenis

    Glenis Guest

    OK thanks, I'll check that out
     
    Glenis, Feb 18, 2007
    #5
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