This class can be used to crop images by removing edges with same color. It can load a GIF, JPEG or PNG image and scans it to detect edges color, so it crops the image to remove the edge areas that have the same color around it. The cropped image is outputted in the same format as the original image. ... Reveal Code
originalSource = $source;
if($destination)
{
$this->destinationSource = $destination;
}
return $this->cropImage();
}
else return false;
}
/**
* @return boolean
*/
private function cropImage()
{
// first we get the filetype
$fileType = mime_content_type($this->originalSource);
if(substr($fileType, 0, 5) == "image")
{
switch($fileType)
{
case "image/jpeg":
$this->originalImage = imagecreatefromjpeg($this->originalSource);
$this->destinationImage = imagecreatefromjpeg($this->originalSource);
break;
case "image/gif":
$this->originalImage = imagecreatefromgif($this->originalSource);
$this->destinationImage = imagecreatefromgif($this->originalSource);
break;
case "image/png":
$this->originalImage = imagecreatefrompng($this->originalSource);
$this->destinationImage = imagecreatefrompng($this->originalSource);
break;
default:
return false;
break;
}
if($this->originalImage)
{
$this->imagecolorswap($this->destinationImage);
$this->edge = $this->imageGetEdges($this->destinationImage, 250, 250, 250);
imagedestroy($this->destinationImage);
$newWidth = $this->edge[0]-$this->edge[2];
$newHeight = $this->edge[1]-$this->edge[3];
$this->destinationImage = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresized(
$this->destinationImage,
$this->originalImage,
0,
0,
$this->edge[2],
$this->edge[3],
$newWidth,
$newHeight,
$newWidth,
$newHeight
);
return $this->outputImage();
}
else return false;
}
else return false;
}
/**
* @return boolean
*/
private function outputImage()
{
if(count($this->edge) == 4)
{
// output the image....as what?
if($this->destinationSource)
{ // save to file
// get the destination extention so we know how to save this image
$fileType = strtolower(substr($this->destinationSource,strripos($this->destinationSource, ".")));
switch($fileType)
{
case ".jpg":
case ".jpeg":
imagejpeg($this->destinationImage, $this->destinationSource);
break;
case ".png":
imagepng($this->destinationImage, $this->destinationSource);
break;
case ".gif":
imagegif($this->destinationImage, $this->destinationSource);
break;
}
}
else
{ // inline display
$fileType = mime_content_type($this->originalSource);
header('Content-type: '.$fileType);
switch($fileType)
{
case "image/jpeg":
imagejpeg($this->destinationImage);
break;
case "image/png":
imagepng($this->destinationImage);
break;
case "image/gif":
imagegif($this->destinationImage);
break;
}
}
return true;
}
else return false;
}
/**
* @param $img (image resource)
* @param $red (color red)
* @param $green (color green)
* @param $blue (color blue)
* @return array(X1, Y1, X2, Y2) (right, bottom, left, top)
* @brief X1,Y1 are the bottom right positions and X2,Y2 are the top left position
*/
private function imageGetEdges(&$img, $red, $green, $blue)
{
// where the color starts thats te edge
$margin = 30;
$width = imagesx($img);
$height = imagesy($img);
$returnX = $this->margin;
$returnY = $this->margin;
$returnXmin = $width-($this->margin);
$returnYmin = $height-($this->margin);
$Xvalues = array();
$Yvalues = array();
$searchColor = imagecolorclosest($img, $red, $green, $blue);
for($x = $margin; $x<($width-$this->margin); $x=$x+1)
{
for($y = $margin; $y<($height-$this->margin); $y=$y+1)
{
$color = imagecolorat($img, $x, $y);
if($color != $searchColor)
{
$aprocX = floor($x/$this->correction)*$this->correction;
$aprocY = floor($y/$this->correction)*$this->correction;
if(isset($Xvalues[$aprocX]))
$Xvalues[$aprocX] += 1;
else
$Xvalues[$aprocX] = 0;
if(isset($Yvalues[$aprocY]))
$Yvalues[$aprocY] += 1;
else
$Yvalues[$aprocY] = 0;
}
}
}
// average X and Y
$returnX = $this->margin;
$returnY = $this->margin;
$returnXmin = $width-($this->margin);
$returnYmin = $height-($this->margin);
foreach($Xvalues AS $X => $aantal)
{
if($X > $returnX && $aantal > 8)
{
$returnX = $X;
}
if($X < $returnXmin && $aantal > 8)
{
$returnXmin = $X;
}
}
foreach($Yvalues AS $Y => $aantal)
{
if($Y > $returnY && $aantal > 8)
{
$returnY = $Y;
$maxAantalY = $aantal;
}
if($Y < $returnYmin && $aantal > 8)
{
$returnYmin = $Y;
}
}
$testmargin = $this->margin + $this->correction;
if($returnX >= $width-($testmargin))
$returnX = $width;
else
$returnX += $this->correction;
if($returnY >= $height-($testmargin))
$returnY = $height;
else
$returnY += $this->correction;
if($returnXmin <= $testmargin)
$returnXmin = 0;
else
$returnXmin -= $this->correction;
if($returnYmin <= $testmargin)
$returnYmin = 0;
else
$returnYmin -= $this->correction;
return array($returnX, $returnY, $returnXmin, $returnYmin);
}
private function imagecolorswap(&$img)
{
// First we remove the background
imagefilter($img, IMG_FILTER_SMOOTH, 10);
imagefilter($img, IMG_FILTER_EDGEDETECT);
imagefilter($img, IMG_FILTER_CONTRAST, -90);
imagefilter($img, IMG_FILTER_BRIGHTNESS, -20);
//imagefilter($img, IMG_FILTER_BRIGHTNESS, -40);
imagefilter($img, IMG_FILTER_CONTRAST, 20);
// remove color: 120 120 120 TO 180 180 180
if (!($t = imagecolorstotal($img)))
{
$t = 250;
imagetruecolortopalette($img, 1, $t);
}
for ($c = 0; $c < $t; $c++)
{
$cc = imagecolorclosest($img, 150, 150, 150);
imagecolorset($img, $cc, 250, 250, 250);
}
imagefilter($img, IMG_FILTER_COLORIZE, 0, 0, 0);
}
}
?>
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