5 Replies Latest reply on Jan 6, 2008 9:27 AM by pixlor

    export preview checkboxes (jpg)

    123polis123 Level 1
      What are the export preview checkboxes (jpg):
      "Progressive browser display",
      "Sharpen color edges" ?
      also "Smoothing" ? What is best these to setup for 600x450 photos jpg of an online Photo store ?
        • 1. Re: export preview checkboxes (jpg)
          Level 7
          123polis123 wrote:
          > What are the export preview checkboxes (jpg): "Progressive browser
          > display",

          A simple JPEG file is stored as one top-to-bottom scan of the image.
          Progressive JPEG divides the file into a series of scans. The first scan
          shows the image at the equivalent of a very low quality setting.
          Following scans gradually improve the quality. Each scan adds to the
          data already provided, so that the total storage requirement is roughly
          the same as for a baseline JPEG image of the same quality as the final
          scan. Note that the file size of progressive JPEGs is larger, and that
          the format is not supported by Internet Explorer.

          > "Sharpen color edges" ?

          During JPEG compression, areas of harsh contrast or sharp edges tend to
          blur or generate noise (compression artifacts). The Sharpen Color Edges
          feature is a kind of edge adaptive noise reduction. It can make a
          noticeable difference in the quality of some images. It usually
          increases the file size of the image, however, so try optimizing the
          image with and without it to see whether or not you feel it works for a
          particular image.

          > also "Smoothing" ?

          Smoothing does the opposite of Sharpen Color Edges. It blurs the edges
          in the image to reduce noise. It also reduces the file size of an image.

          > What is best these to setup for 600x450 photos jpg of an online Photo
          > store ?

          IMHO, there is no "best setting." Each photo requires experimentation
          with the export settings to achieve the best results.

          --
          Linda Rathgeber [PVII] *Adobe Community Expert-Fireworks*
          --------------------------------------------------------------
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          • 2. Re: export preview checkboxes (jpg)
            Level 7
            and to add to what Linda wrote:

            the "Sharpen color edges" is also really useful if you have a
            banner/masthead/whatever with a photographic background and text set in
            FW, or a logo, as it keeps it all nice and clear ;)

            Linda Rathgeber wrote:
            > 123polis123 wrote:
            >> What are the export preview checkboxes (jpg): "Progressive browser
            >> display",
            >
            > A simple JPEG file is stored as one top-to-bottom scan of the image.
            > Progressive JPEG divides the file into a series of scans. The first scan
            > shows the image at the equivalent of a very low quality setting.
            > Following scans gradually improve the quality. Each scan adds to the
            > data already provided, so that the total storage requirement is roughly
            > the same as for a baseline JPEG image of the same quality as the final
            > scan. Note that the file size of progressive JPEGs is larger, and that
            > the format is not supported by Internet Explorer.
            >
            >> "Sharpen color edges" ?
            >
            > During JPEG compression, areas of harsh contrast or sharp edges tend to
            > blur or generate noise (compression artifacts). The Sharpen Color Edges
            > feature is a kind of edge adaptive noise reduction. It can make a
            > noticeable difference in the quality of some images. It usually
            > increases the file size of the image, however, so try optimizing the
            > image with and without it to see whether or not you feel it works for a
            > particular image.
            >
            >> also "Smoothing" ?
            >
            > Smoothing does the opposite of Sharpen Color Edges. It blurs the edges
            > in the image to reduce noise. It also reduces the file size of an image.
            >
            >> What is best these to setup for 600x450 photos jpg of an online Photo
            >> store ?
            >
            > IMHO, there is no "best setting." Each photo requires experimentation
            > with the export settings to achieve the best results.
            >
            • 3. Re: export preview checkboxes (jpg)
              123polis123 Level 1
              >> What is best these to setup for 600x450 photos jpg of an online Photo store ?
              -----------------------------------
              I have setup "No smoothing" , checked:"Sharpen color edges", unchecked:"Progressive browser display", matte: white , well these settings are correct, about, for photos 700x500 of an online Photo store ?
              • 4. Re: export preview checkboxes (jpg)
                123polis123 Level 1
                when I choose "jpg-better quality" ALL these settings are auto rearranged and DO NOT need to modify ?
                • 5. Re: export preview checkboxes (jpg)
                  pixlor Level 4
                  quote:

                  Originally posted by: 123polis123
                  when I choose "jpg-better quality" ALL these settings are auto rearranged and DO NOT need to modify ?


                  Well, no, that's just a preset, a place to start from. For every image, you need to balance file size against the quality of the image. Depending on what's in the image, the optimal settings will be different. If you have an image that is "soft" and mostly one color (such as a grey misty day), then you will find that your eventual file size is probably smaller than an image that has many hard lines (such as an image of dark tree branches against a bright sky). Each image has different content and will need different settings.

                  The settings that affect quality are
                  Quality
                  Smoothing
                  Sharpen color edges

                  The Progressive browser display is just how you want the image to come in: from top to bottom or from blurry to clear, but it isn't used much around the Web. Checking this box is only a matter of preference, but for smaller images (anything under about 500 pixels or so) it is not worth choosing the progressive format. For large images (anything over 1500 pixels or so), it might be nice for people to get the visual assurance that yes, an image is there, but it will take longer for the image to come in.

                  For thumbnails in your gallery, I certainly wouldn't recommend the progressive display. For any large images you want to show...well, make two versions of an image and see what you think.