you are here: codestackercodes [RSS] → tag gd [RSS]

resize image

<?
////////////////////////////////////////////////////////////////////////////////////
// generate a croped-image from a picture
// source: http://mediumexposure.com/techblog/smart-image-resizing-while-preserving-transparency-php-and-gd-library
// resizes a image, without crop
// usage: resizeImage("test/6.jpg", "540", "720", true, "test/output.jpg")
////////////////////////////////////////////////////////////////////////////////////

function resizeImage( $file, $width = 0, $height = 0, $proportional = false, $output = 'file') {
	$info = getimagesize($file);
	$image = '';
	$final_width = 0;
	$final_height = 0;
	list($width_old, $height_old) = $info;
	if ($proportional) {
		if ($width == 0) $factor = $height/$height_old;
		elseif ($height == 0) $factor = $width/$width_old;
		else $factor = min ( $width / $width_old, $height / $height_old);  
		$final_width = round ($width_old * $factor);
		$final_height = round ($height_old * $factor);
	}
	else {
		$final_width = ( $width <= 0 ) ? $width_old : $width;
		$final_height = ( $height <= 0 ) ? $height_old : $height;
	}
	switch ( $info[2] ) {
		case IMAGETYPE_GIF:
			$image = imagecreatefromgif($file);
		break;
		case IMAGETYPE_JPEG:
			$image = imagecreatefromjpeg($file);
		break;
		case IMAGETYPE_PNG:
			$image = imagecreatefrompng($file);
		break;
		default:
			return false;
	}
        
	$image_resized = imagecreatetruecolor( $final_width, $final_height );
			
	if ( ($info[2] == IMAGETYPE_GIF) || ($info[2] == IMAGETYPE_PNG) ) {
		$trnprt_indx = imagecolortransparent($image);

		if ($trnprt_indx >= 0) {
			$trnprt_color    = imagecolorsforindex($image, $trnprt_indx);
			$trnprt_indx    = imagecolorallocate($image_resized, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);
			imagefill($image_resized, 0, 0, $trnprt_indx);
			imagecolortransparent($image_resized, $trnprt_indx);
		} 
		elseif ($info[2] == IMAGETYPE_PNG) {
			imagealphablending($image_resized, false);
			$color = imagecolorallocatealpha($image_resized, 0, 0, 0, 127);
			imagefill($image_resized, 0, 0, $color);
			imagesavealpha($image_resized, true);
		}
	}
	imagecopyresampled($image_resized, $image, 0, 0, 0, 0, $final_width, $final_height, $width_old, $height_old);    
        
	switch ( strtolower($output) ) {
		case 'browser':
			$mime = image_type_to_mime_type($info[2]);
			header("Content-type: $mime");
			$output = NULL;
		break;
		case 'file':
			$output = $file;
		break;
		case 'return':
			return $image_resized;
		break;
		default:
		break;
	}
	switch ( $info[2] ) {
		case IMAGETYPE_GIF:
			imagegif($image_resized, $output);
		break;
		case IMAGETYPE_JPEG:
			imagejpeg($image_resized, $output);
		break;
		case IMAGETYPE_PNG:
			imagepng($image_resized, $output);
		break;
		default:
			return false;
	}
	return true;
}
?>

resize image with crop

////////////////////////////////////////////////////////////////////////////////////
// generate a croped-image from a picture
// source: http://www.seaton-online.com/forum/index.php?showtopic=545
// usage: cropImage("300", "225", "test/5.jpg", "jpg", "test/output.jpg");
////////////////////////////////////////////////////////////////////////////////////

function cropImage($nw, $nh, $source, $stype, $dest) {
         $size = getimagesize($source);
         $w = $size[0];
         $h = $size[1];

          switch($stype) {
              case 'gif':
              $simg = imagecreatefromgif($source);
              break;
              case 'jpg':
              $simg = imagecreatefromjpeg($source);
              break;
              case 'png':
              $simg = imagecreatefrompng($source);
              break;
          }

          $dimg = imagecreatetruecolor($nw, $nh);
          $wm = $w/$nw;
          $hm = $h/$nh;
          $h_height = $nh/2;
          $w_height = $nw/2;

          if($w> $h) {
              $adjusted_width = $w / $hm;
              $half_width = $adjusted_width / 2;
              $int_width = $half_width - $w_height;
              imagecopyresampled($dimg,$simg,-$int_width,0,0,0,$adjusted_width,$nh,$w,$h);
          } elseif(($w <$h) || ($w == $h)) {
              $adjusted_height = $h / $wm;
              $half_height = $adjusted_height / 2;
              $int_height = $half_height - $h_height;
              imagecopyresampled($dimg,$simg,0,-$int_height,0,0,$nw,$adjusted_height,$w,$h);
          } else {
              imagecopyresampled($dimg,$simg,0,0,0,0,$nw,$nh,$w,$h);
          }

          imagejpeg($dimg,$dest,80);
}
Displaying all 2 Code