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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 SGaist

    IIRC, the plugin will be replaced directly in your Qt installation once built

    mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on last edited by
    #11

    @SGaist
    As in
    D:\Qt\Tools\QtCreator\bin\plugins\imageformats
    hmm
    http://doc.qt.io/qt-5/qtimageformats-index.html

    dont list PNG.

    So its not a plugin but sort of build in ?

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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
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      • 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.

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                  • _ Offline
                    _ Offline
                    __d4ve__
                    wrote on last edited by
                    #19

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

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                    • 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.

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                      • 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.

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