get image size from binary data

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  • Christoph Burschka
    #1

    get image size from binary data

    Is there some way to get the dimensions of an image, given the binary
    data of the image, without having to write it to a temporary file?

    It seems that getimagesize() will only take a filename, but since I have
    to download the image from a remote URL with fsockopen(), I have it
    stored as a binary string.

    I've had a cursory glance at the data, but predictably the size is not
    stored in decimal format anywhere...

    --
    cb

    Tags: None
    • james.gauth@googlemail.com
      #2
      Re: get image size from binary data

      On 26 Jun, 08:31, Christoph Burschka <christoph.burs c...@rwth-
      aachen.dewrote:
      Is there some way to get the dimensions of an image, given the binary
      data of the image, without having to write it to a temporary file?
      >
      It seems that getimagesize() will only take a filename, but since I have
      to download the image from a remote URL with fsockopen(), I have it
      stored as a binary string.
      >
      I've had a cursory glance at the data, but predictably the size is not
      stored in decimal format anywhere...
      >
      --
      cb
      If the image format is supported by your GD Library, you can use the
      following:

      <?php

      $binary_data = file_get_conten ts('http://www.google.co.u k/intl/en_uk/
      images/logo.gif');

      $im = imagecreatefrom string($binary_ data);

      $width = imagesx($im);
      $height = imagesy($im);

      print "width: $width\n";
      print "height: $height\n";

      ?>

        Comment

        • Armand Brahaj
          #3
          Re: get image size from binary data

          james.gauth@goo glemail.com wrote:
          On 26 Jun, 08:31, Christoph Burschka <christoph.burs c...@rwth-
          aachen.dewrote:
          >Is there some way to get the dimensions of an image, given the binary
          >data of the image, without having to write it to a temporary file?
          >>
          >It seems that getimagesize() will only take a filename, but since I have
          >to download the image from a remote URL with fsockopen(), I have it
          >stored as a binary string.
          >>
          >I've had a cursory glance at the data, but predictably the size is not
          >stored in decimal format anywhere...
          >>
          >--
          >cb
          >
          If the image format is supported by your GD Library, you can use the
          following:
          >
          <?php
          >
          $binary_data = file_get_conten ts('http://www.google.co.u k/intl/en_uk/
          images/logo.gif');
          >
          $im = imagecreatefrom string($binary_ data);
          >
          $width = imagesx($im);
          $height = imagesy($im);
          >
          print "width: $width\n";
          print "height: $height\n";
          >
          ?>
          >
          Someone correct me if I am wrong, but whenever you open an image/file to
          read (even if you want to read the headers) you are storing it to some
          temporary buffer/space on your machine!
          Maybe the GD solution above is the best!

          Armand

            Comment

            • Christoph Burschka
              #4
              Re: get image size from binary data

              Armand Brahaj wrote:
              james.gauth@goo glemail.com wrote:
              >On 26 Jun, 08:31, Christoph Burschka <christoph.burs c...@rwth-
              >aachen.dewrote :
              >>Is there some way to get the dimensions of an image, given the binary
              >>data of the image, without having to write it to a temporary file?
              >>>
              >>It seems that getimagesize() will only take a filename, but since I have
              >>to download the image from a remote URL with fsockopen(), I have it
              >>stored as a binary string.
              >>>
              >>I've had a cursory glance at the data, but predictably the size is not
              >>stored in decimal format anywhere...
              >>>
              >>--
              >>cb
              >>
              >If the image format is supported by your GD Library, you can use the
              >following:
              >>
              ><?php
              >>
              >$binary_data = file_get_conten ts('http://www.google.co.u k/intl/en_uk/
              >images/logo.gif');
              >>
              >$im = imagecreatefrom string($binary_ data);
              >>
              >$width = imagesx($im);
              >$height = imagesy($im);
              >>
              >print "width: $width\n";
              >print "height: $height\n";
              >>
              >?>
              >>
              >
              Someone correct me if I am wrong, but whenever you open an image/file to
              read (even if you want to read the headers) you are storing it to some
              temporary buffer/space on your machine!
              Maybe the GD solution above is the best!
              >
              Armand
              Yeah, so I'd be downloading the image data, saving it to a temporary
              file, reading the temp file into the buffer and getting the header. Not
              exactly efficient.

              Thanks for imagecreatefrom string(); that was exactly the function I was
              looking for!

              --
              cb

                Comment

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