Sharpening images in PHP_PHP tutorial

　

　 //Read image type

　 //1 = GIF, 2 = JPG, 3 = PNG, 4 = SWF, 5 = PSD, 6 = BMP , 7 = TIFF(intel byte order), 8 = TIFF(motorola byte order), 9 = JPC, 10 = JP2, 11 = JPX, 12 = JB2, 13 = SWC, 14 = IFF

Function GetImageType ($filename) {return (($imginfo=@getimagesize($filename))!=null ? $imginfo[2] : null);} 　

　//Image sharpening

　/ /$scr_im: image resource handle, $degree: sharpening degree

Function Sharp(&$src_im, &$dst_im, $degree)

{

$src_x = imagesx($src_im);

$src_y = imagesy($src_im);

//$dst_im = imagecreate($src_x, $src_y);

//imagecopy ($dst_im, $src_im, 0, 0, 0, 0, $src_x, $src_y);

$cnt = 0;

for ($x=1; $x<$ src_x; $x++)

for ($y=1; $y<$src_y; $y++)

{

$src_clr1 = imagecolorsforindex($src_im, imagecolorat( $src_im, $x-1, $y-1));

$src_clr2 = imagecolorsforindex($src_im, imagecolorat($src_im, $x, $y));

$r = intval($src_clr2["red"]+$degree*($src_clr2["red"]-$src_clr1["red"]));

　 $g = intval($src_clr2["green" ]+$degree*($src_clr2["green"]-$src_clr1["green"]));

　 $b = intval($src_clr2["blue"]+$degree*($src_clr2[ "blue"]-$src_clr1["blue"]));

　 $r = min(255, max($r, 0));

$g = min(255, max($g, 0));

$b = min(255, max($b, 0));

//echo "r:$r, g:$g , b:$b
";

　 if (($dst_clr=imagecolorexact($dst_im, $r, $g, $b))==-1)

$dst_clr = Imagecolorallocate($dst_im, $r, $g, $b);

$cnt++;

if ($dst_clr==-1) die("color allocate faile at $ x, $y ($cnt).");

imagesetpixel($dst_im, $x, $y, $dst_clr);

}

return $dst_im;

　} 　

　$ImageFunctions = array("imagecreatefromwbmp", "imagecreatefromgif", "imagecreatefromjpeg", "imagecreatefrompng"); 　

　if (!empty($_POST[" ImageName"]))

　{

set_time_limit(10*60);

if (($ImageType=GetImageType($_POST["ImageName"]))== false)

die("The specified file does not exist or is not a valid image or does not support the type! ");

if ($ImageType==6) $ImageType = 0;

if ($ImageType>3) die("Unsupported image type!");

$im1 = $ImageFunctions[$ImageType]($_POST["ImageName"]);

$im2 = $ImageFunctions[$ImageType]($_POST["ImageName"]);

//print_r(imagecolorsforindex($im, imagecolorat($im, 10, 10)));

Sharp($im1, $im2, $_POST["Degree"]);

header("Content-type: image/png");

imagepng($im2);

imagedestroy($im1);

imagedestroy($im2 );

　}　

　?>

　

Please Enter the local path or URL of the image:

　 " size=32>

Sharpening degree (example: 0.6, 3.0):

　">

　

　

I changed it and saved a $im:

function Sharp2(&$im, $degree)

{

$cnt = 0;

for ($x=imagesx($im)-1; $x>0; $x--)

for ($y =imagesy($im)-1; $y>0; $y--)

　 {

　 $clr1 = imagecolorsforindex($im, imagecolorat($im, $x-1, $y-1));

$clr2 = imagecolorsforindex($im, imagecolorat($im, $x, $y));

$r = intval($clr2["red "]+$degree*($clr2["red"]-$clr1["red"]));

　 $g = intval($clr2["green"]+$degree*($clr2 ["green"]-$clr1["green"]));

　 $b = intval($clr2["blue"]+$degree*($clr2["blue"]-$clr1[ "blue"]));

$r = min(255, max($r, 0));

$g = min(255, max($g, 0)) ;

　 $b = min(255, max($b, 0));

　 //echo "r:$r, g:$g, b:$b
";

if (($new_clr=imagecolorexact($im, $r, $g, $b))==-1)

$new_clr = Imagecolorallocate($im, $r , $g, $b);

$cnt++;

if ($new_clr==-1) die("color allocate faile at $x, $y ($cnt)." );

imagesetpixel($im, $x, $y, $new_clr);

}

} 

http://www.bkjia.com/PHPjc/314463.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/314463.htmlTechArticle? //Read image type//1 = GIF, 2 = JPG, 3 = PNG, 4 = SWF, 5 = PSD, 6 = BMP, 7 = TIFF(intel byte order), 8 = TIFF(motorola byte order), 9 = JPC, 10 = JP2, 11 = JPX, 12 = JB2,...