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image editing - grayscale an image was created/last modified on Sat 13 Mar 2004 2:45 PM

converts an image into greyscale
    
     <?php
     
   function create_grey($input,$output)
   {
    $bild = imagecreatefromjpeg($input);
    $x = imagesx($bild);
    $y = imagesy($bild);
   
    for($i=0; $i<$y; $i++)
    {
     for($j=0; $j<$x; $j++)
     {
      $pos = imagecolorat($bild, $j, $i);
      $f = imagecolorsforindex($bild, $pos);
      $gst = $f["red"]*0.15 + $f["green"]*0.5 + $f["blue"]*0.35;
      $col = imagecolorresolve($bild, $gst, $gst, $gst);
      imagesetpixel($bild, $j, $i, $col);
     }
    }
    imagejpeg($bild,$output,90);
   }
     
     ?>            

learn more about some of the PHP functions used in this snippet: for, function, imagecolorat, imagecolorresolve, imagecolorsforindex, imagecreate, imagecreatefromjpeg, imagejpeg, imagesetpixel, imagesx, imagesy

view the GNU general license - view the GNU library license - search on PHPsnippets - see your code like this

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