Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. Mobile and Embedded
  4. Display BMP image from raw bitmap file
Forum Updated to NodeBB v4.3 + New Features

Display BMP image from raw bitmap file

Scheduled Pinned Locked Moved Mobile and Embedded
am335xqt4.8raw imagesbitmapqlabelpixmap
6 Posts 2 Posters 6.4k Views 1 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • V Offline
    V Offline
    vk41286
    wrote on last edited by vk41286
    #1

    I am using Ti AM335x Board.

    I am trying to create a QT application which will display a image (bmp) from a raw bitmap file. The raw bitmap file is of .panel file format. Its in RGB565 format.

    How do we use/convert the raw bitmap (img.panel) into a bmp file, so I can use it Qimage.

    Here is my sample Code :

    QFile file("/usr/bitmap.bmp");
    if (!file.open(QFile::ReadOnly))
    return 0;

    QByteArray array = file.readAll();
    QImage image((const uchar*)array.data(), h_bitmap, v_bitmap, QImage::Format_RGB16);
    image.save("/usr/test_qimg_16.bmp","BMP");
    image = image.convertToFormat(QImage::Format_RGB16);
    image.load("/usr/test_qimg_16.bmp");
    QLabel myLabel;
    myLabel.setPixmap(QPixmap::fromImage(myImage));
    myLabel.show();

    Here I am able to get the bmp image on label. But the image is distorted a lot. Its not as original image.

    Could any one help on this regard.
    Thank you

    1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Hi and welcome to devnet,

      What happens if you just open the file in a QImage before setting it on the QLabel ?

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

      1 Reply Last reply
      0
      • V Offline
        V Offline
        vk41286
        wrote on last edited by
        #3

        The image itself is distorted before sending it to Qlabel.

        Here is the image I get after i run the above code. The display is 160 X 128 LCD. No touch screen and No mouse.
        http://tinypic.com/r/kb4pd4/8

        Original image should be like this.
        http://tinypic.com/r/dptpq1/8

        Any help is appreciated.

        Thank you

        1 Reply Last reply
        0
        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #4

          Is your LCD working in RGB888 ?

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

          V 1 Reply Last reply
          0
          • SGaistS SGaist

            Is your LCD working in RGB888 ?

            V Offline
            V Offline
            vk41286
            wrote on last edited by vk41286
            #5

            @SGaist

            No.
            The LCD works on RGB565 (16bit). Its dimension is 160x128.

            This is the .panel file i.e. is the raw file.

            s000.tinyupload.com/?file_id=02804374183229949724.
            I am trying to read this file and doing above operation.

            This is the original image file
            s000.tinyupload.com/?file_id=37294795439804064119 Thanks for helping.

            How do I get a .panel file ?

            I download a jpeg file width 160x128.
            Then use a package called "netpbm" to convert it to .ppm format.

            Use the package "ppmtopanel" (which is a proprietary package) to convet the .ppm file to .panel file. Now this .panel file is raw file. Its not a bitmap file. But it contains some image.

            Thank you for helping.

            1 Reply Last reply
            0
            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #6

              Do you have Qt configured to use that display ?

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

              1 Reply Last reply
              0

              • Login

              • Login or register to search.
              • First post
                Last post
              0
              • Categories
              • Recent
              • Tags
              • Popular
              • Users
              • Groups
              • Search
              • Get Qt Extensions
              • Unsolved