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  4. [SOLVED] libpng warning: iCCP: known incorrect sRGB profile drive me nuts
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[SOLVED] libpng warning: iCCP: known incorrect sRGB profile drive me nuts

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #12

    No, as in D:\Qt\5.5\MinGW\plugins\imageformats

    Don't mix the Qt you use with Qt Creator.

    PNG support is in qtbase (it's in the list on the second line of the first paragraph). But now that you mentioned it, you're right: it's builtin.

    Interested in AI ? www.idiap.ch
    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

    mrjjM 1 Reply Last reply
    0
    • SGaistS SGaist

      No, as in D:\Qt\5.5\MinGW\plugins\imageformats

      Don't mix the Qt you use with Qt Creator.

      PNG support is in qtbase (it's in the list on the second line of the first paragraph). But now that you mentioned it, you're right: it's builtin.

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

      @SGaist
      Ahh, of cause . Creator is Vs but mingw need its own version.
      Hmm I getting blind, as I see no mention of qtbase but now i know.
      Maybe I should try it on linux where all will be gcc. (I hope)

      Thank you for your time.

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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #14

        The Qt Gui module is in qtbase.

        But again, it has nothing to do with Qt Creator, to make your tests with pngs, you'll have to build qtbase (only qtbase, no need for the rest) so it will be a new Qt version + corresponding Kit for Qt Creator

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

        mrjjM 1 Reply Last reply
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        • SGaistS SGaist

          The Qt Gui module is in qtbase.

          But again, it has nothing to do with Qt Creator, to make your tests with pngs, you'll have to build qtbase (only qtbase, no need for the rest) so it will be a new Qt version + corresponding Kit for Qt Creator

          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by
          #15

          @SGaist
          Ah. That way.
          Is there anywhere I can see which modules are part of what etc? like an overview.
          So qtbase.pro files must the one Im looking for.

          I assume getting the one from
          git://gitorious.org/qt/qtbase.git.

          could work.

          Thank you for all the info.

          mrjjM 1 Reply Last reply
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          • mrjjM mrjj

            @SGaist
            Ah. That way.
            Is there anywhere I can see which modules are part of what etc? like an overview.
            So qtbase.pro files must the one Im looking for.

            I assume getting the one from
            git://gitorious.org/qt/qtbase.git.

            could work.

            Thank you for all the info.

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #16

            well it seems libpng follow standard and
            photoshop is not strict enough, so I just have to live with it or
            strip the profile completely.

            "
            Error detection in some chunks has improved; in particular the iCCP chunk
            reader now does pretty complete validation of the basic format. Some bad
            profiles that were previously accepted are now rejected, in particular the
            very old broken Microsoft/HP sRGB profile. The PNG spec requirement that
            only grayscale profiles may appear in images with color type 0 or 4 and that
            even if the image only contains gray pixels, only RGB profiles may appear
            in images with color type 2, 3, or 6, is now enforced. The sRGB chunk
            is allowed to appear in images with any color type.
            "

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            • mrjjM mrjj

              When adding png exported from photoshop to Qrc
              and using them in the program, I get
              tons of
              libpng warning: iCCP: known incorrect sRGB profile
              libpng warning: iCCP: known incorrect sRGB profile
              (one for each file..)
              Which is pretty annoying.

              No other tool I have that reads png have an issue with these files, only libpng.
              Its photoshop 2015. Profile is correct for all tools I have that can use png profiles.

              Can I somehow disable this warning ?
              thanks

              aghilproA Offline
              aghilproA Offline
              aghilpro
              wrote on last edited by aghilpro
              #17

              @mrjj This Warning is about PNG formats and Qt, Irrelevant to @ztono code. Read more about PNG (Portable Network Graphics) https://en.wikipedia.org/wiki/Portable_Network_Graphics

              PNG has many Formats some old, some not standard for Qt. see more History_and_development You need to use Standard format in Qt.

              Answer To Your Problem: https://stackoverflow.com/questions/43374187/qt-open-a-jpg-file-with-warning-image-format-not-supported

              "I know one thing; that I know nothing." - Socrates

              mrjjM 1 Reply Last reply
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              • aghilproA aghilpro

                @mrjj This Warning is about PNG formats and Qt, Irrelevant to @ztono code. Read more about PNG (Portable Network Graphics) https://en.wikipedia.org/wiki/Portable_Network_Graphics

                PNG has many Formats some old, some not standard for Qt. see more History_and_development You need to use Standard format in Qt.

                Answer To Your Problem: https://stackoverflow.com/questions/43374187/qt-open-a-jpg-file-with-warning-image-format-not-supported

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by mrjj
                #18

                @aghilpro
                Actually it turn out it was the color profile that photoshop put in the png file and
                libpng didn't like it. Seems to have vanish in later Qt versions.

                1 Reply Last reply
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                • _ Offline
                  _ Offline
                  __d4ve__
                  wrote on last edited by
                  #19

                  Open with -> Photoshop -> File -> Save for web... -> Save..

                  1 Reply Last reply
                  0
                  • S Offline
                    S Offline
                    seyed
                    wrote on last edited by
                    #20

                    As a quick solution, you can fix that image using some optimisation utilities.
                    On the MacOS, I successfully solved this problem using the ImageOptim.
                    On other platforms, there is some similar tools such as the Trimage for Linux and the pinga for Windows, but I didn't test these.

                    1 Reply Last reply
                    0
                    • D Offline
                      D Offline
                      drwa
                      wrote on last edited by
                      #21

                      First of all, my image is displayed correctly, despite the warning.
                      I fixed the warning by opening in "Snip & Sketch" Windows application and then, saving it again.

                      1 Reply Last reply
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