Various "Save" options for JPEG file

Discussion in 'Photoshop' started by Aloha, May 15, 2005.

  1. Aloha

    Aloha Guest

    What is the difference between the 3 different options when saving a JPEG
    file? I mostly do printing with my images to create greeting cards on Epson
    Glossy Photo Paper. Is one of these options *better* than another?

    They are:

    Baseline Standard
    Baseline Optimized
    Progressive.

    Thanks, Gene


    ------------------------------------------
    We are such stuff
    As dreams are made on, and our little life
    Is rounded with a sleep.

    "The Tempest" Wm. Shakespeare

    --
     
    Aloha, May 15, 2005
    #1
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  2. Aloha

    tacit Guest

    If you are making images for print, you should not really be using JPEG
    at all. JPEG images are degraded in quality; they are intended for
    situations where the quality of the image is not important and the size
    of the file is important.

    In any event, an image that has been op[ened in Photoshop is no longer a
    JPEG; it is just a collection of pixels sitting in memory, and the
    saving options that the file was created with do not matter.

    To answer your question:

    Baseline Standard is a plain old ordinalry JPEG. It works with anything
    anywhere that can read JPEG files.

    Baseline Optimized is a JPEG that has been optimized for smaller file
    size. Some very, very old browsers, like Netscape 1.0, may have trouble
    showing an optimized JPEG.

    Progressive is intended for large JPEG files that will be downloaded on
    slow dial-up connections. It works by first downloading a very low
    resolution, crude, fuzzy image, so that people on a slow dialup can
    immediately get some sort of sense of what the image looks like; then,
    as more of the image downloads, the file gets sequentially sharper and
    sharper.
     
    tacit, May 15, 2005
    #2
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  3. Did you mean that saving as Baseline Optimized would produce smaller
    files than saving as Baseline Standard? If yes, how much smaller will
    the files be?
    For browsers that do not have problems showing either, what is the
    quality difference between the two, if any?
     
    stillconfused, May 16, 2005
    #3
  4. Aloha

    Tacit Guest

    Yes. Typically, they are not much smaller, and the size difference will
    vary from image to image; best thing to do is experiment.
    Assuming both JPEGs are saved at the same quality, both the Baseline
    Standard and Baseline Optimized will be the same quality.

    I always use Baseline Optimized; i haven't encountered a browser that
    won't read them for...oh, eleven years or so.
     
    Tacit, May 16, 2005
    #4
  5. Aloha

    Craig Flory Guest

    Tacit' gave you some (sort of) incorrect advice. I'm a professional
    photographer ... and always send my images, to the pro color lab, as .jpgs.
    They are full resolution, 12 level, and at 250ppi. I send them over the net
    using ftp service. I have to preface all that by saying that I first save an
    image as a .tif and / or .psd. If you need to re-work an image do it on one
    of those. Then replace the .jpg with the updated version. This way you are
    not saving a degraded version.

    Craig Flory
     
    Craig Flory, May 18, 2005
    #5
  6. Aloha

    KatWoman Guest

    I use the same method for ftp, my printers want 300 dpi jpg at size of the
    print.
    I always save my original, and a layered psd file with all adjustments and
    retouching and not cropped in case I need to revise the cropping later or
    someone needs the full original, and a cropped, flattened tiff in print size
    and hi-res, plus a small jpg copy of that for web display or preview folder.
    Even zipped psd and tiff are usually to large file size to send over the
    net.
     
    KatWoman, May 18, 2005
    #6
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