[PCDOG编程-php]PHP中实现图片的锐化
//读取图像的类型 //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 ? $imginfo : null);} //图
像锐化 //$scr_im:图像资源句柄，$degree:锐化度数 function Sharp(&$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; $x for ($y=1; $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+$degree*($src_clr2
-$src_clr1)); $g = intval($src_clr2+$degree*($src_clr2-$src_clr1)); $b =
intval($src_clr2+$degree*($src_clr2-$src_clr1)); $r = min(255, max($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)) {
set_time_limit(10*60); if (($ImageType=GetImageType($_POST))==false) die(指定文件不存在或不
是有效的图片或不支持类型！); if ($ImageType==6) $ImageType = 0; if ($ImageType>3) die(不支持的图片类
型！); $im1 = $ImageFunctions[$ImageType]($_POST); $im2 = $ImageFunctions[$ImageType]($_POST
); //print_r(imagecolorsforindex($im, imagecolorat($im, 10, 10))); Sharp($im1, $im2, $_POST
); header(Content-type: image/png); imagepng($im2); imagedestroy($im1); imagedestroy
($im2); } ?> 请输入图片的本地路径或URL:> size=32> 锐化度数（例：0.6、3.0）: >
改了一下，省了一个$im： function Sharp2(&$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+$degree*($clr2-$clr1)); $g = intval($clr2+$degree*($clr2-$clr1
)); $b = intval($clr2+$degree*($clr2-$clr1)); $r = min(255, max($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,
$new_clr); } }
转自：PCDOG编程-php
[PCDOG编程-php]PHP中实现图片的锐化
//读取图像的类型 //1 = GIF, 2 = JPG, 3 = PNG, 4 = SWF, 5 = PSD, 6 = BMP, 7 = TIFF(intel byte order),8 = TIFF(motorola byte order), 9 = JPC, 10 = JP2, 11 = JPX, 12 = JB2, 13 = SWC, 14 = IFF function
GetImageType($filename) {return (($imginfo=@getimagesize($filename))!=null ? $imginfo : null);} //图
像锐化 //$scr_im:图像资源句柄，$degree:锐化度数 function Sharp(&$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; $x for ($y=1; $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+$degree*($src_clr2
-$src_clr1)); $g = intval($src_clr2+$degree*($src_clr2-$src_clr1)); $b =
intval($src_clr2+$degree*($src_clr2-$src_clr1)); $r = min(255, max($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)) {
set_time_limit(10*60); if (($ImageType=GetImageType($_POST))==false) die(指定文件不存在或不
是有效的图片或不支持类型！); if ($ImageType==6) $ImageType = 0; if ($ImageType>3) die(不支持的图片类
型！); $im1 = $ImageFunctions[$ImageType]($_POST); $im2 = $ImageFunctions[$ImageType]($_POST
); //print_r(imagecolorsforindex($im, imagecolorat($im, 10, 10))); Sharp($im1, $im2, $_POST
); header(Content-type: image/png); imagepng($im2); imagedestroy($im1); imagedestroy
($im2); } ?> 请输入图片的本地路径或URL:> size=32> 锐化度数（例：0.6、3.0）: >
改了一下，省了一个$im： function Sharp2(&$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+$degree*($clr2-$clr1)); $g = intval($clr2+$degree*($clr2-$clr1
)); $b = intval($clr2+$degree*($clr2-$clr1)); $r = min(255, max($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); } }
转自：PCDOG编程-php
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