PHP中实现图片的锐化

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//读取图像的门类

//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);}

//图像锐化

//$scr_im:图像财富句柄,$degree:锐化度数

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:$bbr/”;

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(“钦定文件官样文章或不是一蹴而就的图纸或不扶持项目!”State of Qatar;

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

if ($ImageType3卡塔尔(قطر‎ die(“不补助的图纸类型!”卡塔尔国;

$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);

}

?

form name=”FormName” action=”” method=”post”

请输入图片的本地路线或UGL450L:br/

input name=”ImageName” type=”text” value=”?=$_POST[“ImageName”]?”
size=32br/

锐化度数:br/

input name=”Degree” type=”text” value=”?=$_POST[“Degree”]?”br/

input type=”submit” value=”提交”

/form

改了一下,省了三个$im:

function Sharp2(&$im, $degree)

{

$cnt = 0;

for ($x=imagesx($im)-1; $x0; $x–)

for ($y=imagesy($im)-1; $y0; $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:$bbr”;

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);

}

}

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