Better image resizing code?

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  • Geuis
    #1

    Better image resizing code?

    Hi, new to the group.

    I use the following code to resize images my users upload. They're
    either blurry or they're jaggy.

    Can someone recommend modifications or different code that will resize
    images smoothly?

    $o_file = $_GET['add'];

    $image_info = getImageSize($o _file); // see EXIF for faster way

    switch ($image_info['mime']) {
    case 'image/gif':
    if (imagetypes() & IMG_GIF) { // not the same as IMAGETYPE
    $o_im = imageCreateFrom GIF($o_file);
    } else {
    $ermsg = 'GIF images are not supported<br />';
    }
    break;
    case 'image/jpeg':
    if (imagetypes() & IMG_JPG) {
    $o_im = imageCreateFrom JPEG($o_file);
    } else {
    $ermsg = 'JPEG images are not supported<br />';
    }
    break;
    case 'image/png':
    if (imagetypes() & IMG_PNG) {
    $o_im = imageCreateFrom PNG($o_file);
    } else {
    $ermsg = 'PNG images are not supported<br />';
    }
    break;
    case 'image/wbmp':
    if (imagetypes() & IMG_WBMP) {
    $o_im = imageCreateFrom WBMP($o_file);
    } else {
    $ermsg = 'WBMP images are not supported<br />';
    }
    break;
    default:
    $ermsg = $image_info['mime'].' images are not supported<br
    />';
    break;
    }

    if (!isset($ermsg) ) {

    list($width, $height) = getimagesize($o _file);

    if($width>200){

    $t_wd = 200;
    $t_ht = round(($t_wd / $width) * $height);
    $t_im = imageCreateTrue Color($t_wd,$t_ ht);
    imagecopyresamp led ($t_im,$o_im,0, 0,0,0,$t_wd,$t_ ht,$width,$heig ht);

    imageJPEG($t_im );
    imageDestroy($t _im);

    }else{

    imageJPEG($o_im );
    imageDestroy($o _im);
    }

    }
    ?>

    Tags: None
    • gbbulldog
      #2
      Re: Better image resizing code?

      Geuis wrote:
      Hi, new to the group.
      >
      I use the following code to resize images my users upload. They're
      either blurry or they're jaggy.
      >
      Can someone recommend modifications or different code that will resize
      images smoothly?
      >
      $o_file = $_GET['add'];
      >
      $image_info = getImageSize($o _file); // see EXIF for faster way
      >
      switch ($image_info['mime']) {
      case 'image/gif':
      if (imagetypes() & IMG_GIF) { // not the same as IMAGETYPE
      $o_im = imageCreateFrom GIF($o_file);
      } else {
      $ermsg = 'GIF images are not supported<br />';
      }
      break;
      case 'image/jpeg':
      if (imagetypes() & IMG_JPG) {
      $o_im = imageCreateFrom JPEG($o_file);
      } else {
      $ermsg = 'JPEG images are not supported<br />';
      }
      break;
      case 'image/png':
      if (imagetypes() & IMG_PNG) {
      $o_im = imageCreateFrom PNG($o_file);
      } else {
      $ermsg = 'PNG images are not supported<br />';
      }
      break;
      case 'image/wbmp':
      if (imagetypes() & IMG_WBMP) {
      $o_im = imageCreateFrom WBMP($o_file);
      } else {
      $ermsg = 'WBMP images are not supported<br />';
      }
      break;
      default:
      $ermsg = $image_info['mime'].' images are not supported<br
      />';
      break;
      }
      >
      if (!isset($ermsg) ) {
      >
      list($width, $height) = getimagesize($o _file);
      >
      if($width>200){
      >
      $t_wd = 200;
      $t_ht = round(($t_wd / $width) * $height);
      $t_im = imageCreateTrue Color($t_wd,$t_ ht);
      imagecopyresamp led ($t_im,$o_im,0, 0,0,0,$t_wd,$t_ ht,$width,$heig ht);
      >
      imageJPEG($t_im );
      imageDestroy($t _im);
      >
      }else{
      >
      imageJPEG($o_im );
      imageDestroy($o _im);
      }
      >
      }
      ?>
      Have a look at http://uk.php.net/manual/en/function.imagejpeg.php -
      imagejpeg() has a third parameter for quality.

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