13 Replies Latest reply on Aug 16, 2008 7:01 AM by Newsgroup_User

    Help?  Image quality settings error

    Yunus_Tierney
      I have been working with Fireworks for a few years now. Just recently I started having or noticing this problem:

      If I try to save an existing jpg (or a png file, or other) to a jpg format using Save As, and then click on the options dialog box to open the Image Preview dialog box, and adjust the quality slider, and then save the file - the newly created file is not affected by what I set. To make it a gross example, I took an image with good clarity, and adjusted the quality to 20% so that it looked all pixelated in the priview box, but when I saved it, it came out clean.

      Any comments, explanations, help?

      thanks,

      David
        • 1. Re: Help?  Image quality settings error
          JoeDaSilva Level 4
          "Save As" won't retain any of the export preferences you set in image preview. Just go to File > Image Preview and then set your compressions options and click export. This will give you the results you're after.

          If this doesn't work for your particular application let me know what you're trying to accomplish and I'll help you figure it out.
          • 2. Re: Help?  Image quality settings error
            Level 7
            JoeyD1978 wrote:
            > "Save As" won't retain any of the export preferences you set in image preview.
            > Just go to File > Image Preview and then set your compressions options and
            > click export. This will give you the results you're after.
            >
            > If this doesn't work for your particular application let me know what you're
            > trying to accomplish and I'll help you figure it out.
            >
            Actually, if you use the Options button IN the Save As box, it *should*
            use the attributes you set. I just did a test and it worked as expected
            for me. I got a really cruddy jpeg when I set the quality to around 20.
            It also worked wen I reset it to a GIF format with 4 colors.

            --
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            • 3. Re: Help?  Image quality settings error
              JoeDaSilva Level 4
              Ahhhh! I don't think I've ever even noticed that options button. I wonder if that was what the OP was doing?

              I concur with Jim in regards to the option button that appears in the lower right corner of the "Save As" dialog box. This one saves my export attributes just fine.
              • 4. Re: Help?  Image quality settings error
                Yunus_Tierney Level 1
                So if I have an image sent to me by someone who already seemed to have reduced the quality (because I assume when it opens in image preview and has a quality setting shown as some random number that that is what the person before me did to it?)

                - and I simply want to reduce its size via modify/canvas/image size, and then save it under a new name - you recommend instead of using the Save As function, i should use the image preview path as you described above? Is this how you would do it?

                thanks
                • 5. Re: Help?  Image quality settings error
                  Yunus_Tierney Level 1
                  When I use the option button when saving as, it does not seem to retain the setting I set it at. I am on a mac using cs3.


                  • 6. Re: Help?  Image quality settings error
                    Yunus_Tierney Level 1
                    What I find is that when I use that option button to display jpg options, it displays a quality percentage that seems to vary according to what image I am working with. And whatever that is set at to begin with seems to be the result I get, no matter if I change that setting or not.

                    Is this not what is happening for you?
                    • 7. Re: Help?  Image quality settings error
                      Level 7
                      Yunus Tierney wrote:
                      > What I find is that when I use that option button to display jpg options, it
                      > displays a quality percentage that seems to vary according to what image I am
                      > working with. And whatever that is set at to begin with seems to be the result
                      > I get, no matter if I change that setting or not.
                      >
                      > Is this not what is happening for you?
                      >
                      Correct, it is not happening for me. The initial quality setting is most
                      likely the one that was set for that image, but I have no problem
                      changing that. I am also giving the file a new name.

                      --
                      Jim Babbage - .:Community MX:. & .:Adobe Community Expert:.
                      http://www.communityMX.com/
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                      • 9. Re: Help?  Image quality settings error
                        Yunus_Tierney Level 1
                        If this is happening for me then, how do I report a bug to Adobe?

                        I am working on a fairly new iMac(7,1) using Leopard 10.5.4, using CS3 version of Fireworks.

                        Thanks,

                        david
                        • 10. Re: Help?  Image quality settings error
                          Level 7
                          On Thu, 31 Jul 2008, Yunus Tierney wrote

                          >So if I have an image sent to me by someone who already seemed to have
                          >reduced the quality (because I assume when it opens in image preview
                          >and has a quality setting shown as some random number that that is what
                          >the person before me did to it?)

                          No.

                          This article:

                          "Determine the JPEG quality factor by using Visual C# .NET"
                          http://support.microsoft.com/kb/324790

                          says: "The quality factor is not stored directly in the JPEG file, so
                          you cannot read the quality factor from the file."

                          Also there is no 'standard' for quality factor values i.e. it's an
                          arbitrary number. One programs 50% may be the same as another programs
                          70%. It is difficult to see how this could be otherwise as there is no
                          single jpeg compression algorithm.

                          A jpeg can store proprietary information, as do Fireworks jpeg files, so
                          it is conceivable that quality number could be stored in a Fireworks
                          jpeg, but it wouldn't tell one anything because it's not an absolute
                          number. A 64% value could be 80% of an 80%.

                          --
                          Richard Mason
                          http://www.emdpi.com
                          • 11. Re: Help?  Image quality settings error
                            Yunus_Tierney Level 1
                            Bottom line is, I followed the Save As - JPG - gave it another name and when it was saved, it was saved a very very reduced quality. When I do the same thing, and click on the Options button, the quality shown is 37. When I change that 37 to 100%, and save the settings and the file, the file still comes out with very very reduced quality.

                            So what gives. Is this not a bug??

                            thanks,

                            david
                            • 12. Re: Help?  Image quality settings error
                              Level 7
                              why aren't you using *export*?!

                              Yunus Tierney wrote:
                              > Bottom line is, I followed the Save As - JPG - gave it another name and when it
                              > was saved, it was saved a very very reduced quality. When I do the same thing,
                              > and click on the Options button, the quality shown is 37. When I change that
                              > 37 to 100%, and save the settings and the file, the file still comes out with
                              > very very reduced quality.
                              >
                              > So what gives. Is this not a bug??
                              >
                              > thanks,
                              >
                              > david
                              >
                              • 13. Re: Help?  Image quality settings error
                                Level 7
                                Yunus Tierney wrote:
                                > Bottom line is, I followed the Save As - JPG - gave it another name and when it
                                > was saved, it was saved a very very reduced quality. When I do the same thing,
                                > and click on the Options button, the quality shown is 37. When I change that
                                > 37 to 100%, and save the settings and the file, the file still comes out with
                                > very very reduced quality.
                                >
                                > So what gives. Is this not a bug??
                                >
                                > thanks,
                                >
                                > david
                                >
                                Increasing the quality after the file has been compressed is not going
                                to give you a better quality image. At some point the file was saved
                                with a quality setting of 37%. So even when you set the file to 100%,
                                you're only getting 100 % quality of a highly compressed image. You
                                can't undo that unless you have another version of the file, perhaps the
                                original.

                                Keep in mind that jpeg is lossy; it permanently discards original data.



                                --
                                Jim Babbage - .:Community MX:. & .:Adobe Community Expert:.
                                http://www.communityMX.com/
                                CommunityMX - Free Resources:
                                http://www.communitymx.com/free.cfm
                                ---
                                .:Adobe Community Expert for Fireworks:.
                                Adobe Community Expert
                                http://tinyurl.com/2a7dyp
                                ---
                                See my work on Flickr
                                http://www.flickr.com/photos/jim_babbage/