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  4. LZW anybody??

LZW anybody??

Scheduled Pinned Locked Moved C / C++ / MFC
graphicsquestion
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  • K Offline
    K Offline
    keb
    wrote on last edited by
    #1

    Ok... I didn't have any luck yesterday but I have a feeling someone can save me here today... Well, I am looking for free shareware, library to handle LZW data. I am writing a software that import and export graphics and hoping to avoide Unisys patent. Any suggestions anybody???:rolleyes::rolleyes::rolleyes:

    L P 2 Replies Last reply
    0
    • K keb

      Ok... I didn't have any luck yesterday but I have a feeling someone can save me here today... Well, I am looking for free shareware, library to handle LZW data. I am writing a software that import and export graphics and hoping to avoide Unisys patent. Any suggestions anybody???:rolleyes::rolleyes::rolleyes:

      L Offline
      L Offline
      Larry Antram
      wrote on last edited by
      #2

      The LZW patent is no longer relevant in the U.S. (it expired last month). Take a look at CxImage[^] for importing/exporting graphics.

      K 1 Reply Last reply
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      • L Larry Antram

        The LZW patent is no longer relevant in the U.S. (it expired last month). Take a look at CxImage[^] for importing/exporting graphics.

        K Offline
        K Offline
        keb
        wrote on last edited by
        #3

        Well, I am hoping to use this software in Asia and Europe as well as here and unfortunately the patant has not expired in those places. I was hoping to find an algorithm or free shareware to get by with Unisys but may be I just have to bite the bullet here.. hmmmm.. Thanks for the link. This may be something I can use later. :cool::cool:

        L P 2 Replies Last reply
        0
        • K keb

          Ok... I didn't have any luck yesterday but I have a feeling someone can save me here today... Well, I am looking for free shareware, library to handle LZW data. I am writing a software that import and export graphics and hoping to avoide Unisys patent. Any suggestions anybody???:rolleyes::rolleyes::rolleyes:

          P Offline
          P Offline
          perlmunger
          wrote on last edited by
          #4

          If you're using GIFs *AT ALL* you cannot avoid the Unisys patent. As far as a library to handle it, look at GDI+ (namespace System.Drawing.Imaging). It handles many different image formats including GIF with the "Image" and "Bitmap" objects. Someone correct me if I'm wrong, but I think you just have to license the GIF "technology" from Unisys if you distribute it. Good luck. -Matt ------------------------------------------ The 3 great virtues of a programmer: Laziness, Impatience, and Hubris. --Larry Wall

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          • K keb

            Well, I am hoping to use this software in Asia and Europe as well as here and unfortunately the patant has not expired in those places. I was hoping to find an algorithm or free shareware to get by with Unisys but may be I just have to bite the bullet here.. hmmmm.. Thanks for the link. This may be something I can use later. :cool::cool:

            L Offline
            L Offline
            Larry Antram
            wrote on last edited by
            #5

            Just use PNG instead... it was created specifically to avoid LZW patent issues. CxImage includes support.

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            • L Larry Antram

              Just use PNG instead... it was created specifically to avoid LZW patent issues. CxImage includes support.

              J Offline
              J Offline
              John M Drescher
              wrote on last edited by
              #6

              Larry Antram wrote: Just use PNG instead... This is what I tell everyone. Do not use TIFF or GIF and all will be fine. John

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              • K keb

                Well, I am hoping to use this software in Asia and Europe as well as here and unfortunately the patant has not expired in those places. I was hoping to find an algorithm or free shareware to get by with Unisys but may be I just have to bite the bullet here.. hmmmm.. Thanks for the link. This may be something I can use later. :cool::cool:

                P Offline
                P Offline
                peterchen
                wrote on last edited by
                #7

                Unisys doesn't license to shareware or freeware authors. That is, Unisys doesn't license to library developers anymore at all. The final application is the one that is allowed to pay royalties. Meaning: Whatever you do, it's illegal in Europe and Asia, until the patent(s) expire.


                "Der Geist des Kriegers ist erwacht / Ich hab die Macht" StS
                sighist | Agile Programming | doxygen

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