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Image plugin

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  • mrjjM mrjj

    @samdol
    Hi do you mean a raw image format like in cameras or just raw as in no header etc?
    http://stackoverflow.com/questions/18637721/how-to-display-a-raw-image-file-in-a-qt-gui

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    S Offline
    samdol
    wrote on last edited by
    #12

    @mrjj
    I mean the image format like in cameras, such as CRW, NEF,...

    mrjjM 1 Reply Last reply
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    • S samdol

      @mrjj
      I mean the image format like in cameras, such as CRW, NEF,...

      mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #13

      @samdol said in Image plugin:

      CRW

      Nope, never saw such plugin. For some camera vendors you have to use the SDK to read it.
      http://amin-ahmadi.com/2016/06/09/how-to-handle-canon-eos-raw-images-in-qt-c/

      Alternatively, you can use a lib
      http://www.libraw.org/
      and use to convert to format that you can
      load or embed into Qt app so it can load native.

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      • mrjjM mrjj

        @samdol said in Image plugin:

        CRW

        Nope, never saw such plugin. For some camera vendors you have to use the SDK to read it.
        http://amin-ahmadi.com/2016/06/09/how-to-handle-canon-eos-raw-images-in-qt-c/

        Alternatively, you can use a lib
        http://www.libraw.org/
        and use to convert to format that you can
        load or embed into Qt app so it can load native.

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        samdol
        wrote on last edited by
        #14

        @mrjj
        Thank you for the link.
        Is the libraw OK to be used on commercial project?
        Do I have to buy the license to use in commercial project?

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        • M Offline
          M Offline
          mchinand
          wrote on last edited by
          #15

          See the licensing options for libraw here. If you adhere to the terms of one of these licenses you can probably use it in a commercial project.

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          • mrjjM mrjj

            @samdol
            Hi do you mean a raw image format like in cameras or just raw as in no header etc?
            http://stackoverflow.com/questions/18637721/how-to-display-a-raw-image-file-in-a-qt-gui

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            S Offline
            samdol
            wrote on last edited by
            #16

            @mrjj

            From the link, it seems we need to know
            width, height ,QImage::Format about the raw image file before read it.
            Could we know those information before read it?

            mrjjM 1 Reply Last reply
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            • S samdol

              @mrjj

              From the link, it seems we need to know
              width, height ,QImage::Format about the raw image file before read it.
              Could we know those information before read it?

              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #17

              @samdol said in Image plugin:

              Could we know those information before read it?

              Not really. That is why raw means many things.
              One can guess about it if knowing color format/depth and the filesize but
              ultimately it could be anything.

              For Cameras the raw format means uncompressed. Each vendor might save raw differently and hence
              its not easy to "just" read raw files.

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              • mrjjM mrjj

                @samdol said in Image plugin:

                Could we know those information before read it?

                Not really. That is why raw means many things.
                One can guess about it if knowing color format/depth and the filesize but
                ultimately it could be anything.

                For Cameras the raw format means uncompressed. Each vendor might save raw differently and hence
                its not easy to "just" read raw files.

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                S Offline
                samdol
                wrote on last edited by
                #18

                @mrjj
                when tried the code in the link with some raw files (NiKON NEF, ..) I could only see unrecognizable dots on the screen. Is it because I did not put the right w, h and format?

                mrjjM 1 Reply Last reply
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                • S samdol

                  @mrjj
                  when tried the code in the link with some raw files (NiKON NEF, ..) I could only see unrecognizable dots on the screen. Is it because I did not put the right w, h and format?

                  mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by
                  #19

                  @samdol
                  Yes if you specify wrong parameters for the format it will look distorted.

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                  • mrjjM mrjj

                    @samdol
                    Yes if you specify wrong parameters for the format it will look distorted.

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                    S Offline
                    samdol
                    wrote on last edited by
                    #20

                    @mrjj
                    I saw some image Viewer shows raw image file. I wonder how it could read raw image. Because in order to read it correctly, we need to know the w, h, format in advance and there is no way to know w,h, format.

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                    • mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by
                      #21

                      Well most of the viewers use a library and hence knows vendor raw format and can guess
                      at format otherwise. Many raw formats do have a header to give more info.
                      So for camera raw means uncompressed and non filtered and not so much raw block of image data as it
                      means in other contexts.

                      1 Reply Last reply
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