PHP一般情况下生成的缩略图都比较不理想 - cncml手绘网

<?php t' u( ^3 H! P
$FILENAME="image.thumb"; 0 r0 |0 x; M/ ^
// 生成图片的宽度 ! _$ x3 j4 g" \+ w& |
$RESIZEWIDTH=400;
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// 生成图片的高度
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$RESIZEHEIGHT=400;8 [( n: e4 Q! R- Z3 I( _$ d
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function ResizeImage($im,$maxwidth,$maxheight,$name){
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$width = imagesx($im);
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$height = imagesy($im); / A( X8 L9 i1 A, x2 D9 J, V
if(($maxwidth && $width > $maxwidth) || ($maxheight && $height > $maxheight)){
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if($maxwidth && $width > $maxwidth){ % q5 U j) l7 Y5 ~
$widthratio = $maxwidth/$width;
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$RESIZEWIDTH=true; 8 Z/ [: `# F' z M
}
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if($maxheight && $height > $maxheight){ " H# O! p$ V2 r# h! t2 b# g6 o
$heightratio = $maxheight/$height; ( W1 Y. y: W3 N$ L2 W I: F
$RESIZEHEIGHT=true; 3 l- R1 m/ h4 [3 t
} & I; e7 ?% L' W) P8 w/ a
if($RESIZEWIDTH && $RESIZEHEIGHT){ ; Y! }2 k( L9 G e' R
if($widthratio < $heightratio){ 0 ?$ k9 X, A0 _& U" b4 M$ a" K9 y% G
$ratio = $widthratio;
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}else{
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$ratio = $heightratio; ; j+ Q$ q' B5 m/ W7 b
}
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}elseif($RESIZEWIDTH){
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$ratio = $widthratio;
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}elseif($RESIZEHEIGHT){
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$ratio = $heightratio; 4 ?, s( D# j- c
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$newwidth = $width * $ratio;
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$newheight = $height * $ratio;
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if(function_exists("imagecopyresampled")){
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$newim = imagecreatetruecolor($newwidth, $newheight);
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imagecopyresampled($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
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}else{ 9 {1 @/ {0 n2 Q% `
$newim = imagecreate($newwidth, $newheight);
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imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
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ImageJpeg ($newim,$name . ".jpg");
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ImageDestroy ($newim);
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}else{ + l' V6 g( U* `
ImageJpeg ($im,$name . ".jpg"); 8 q% x2 ?7 Q, e) j& G
} : a. r0 W( G3 _" O6 O
}
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if($_FILES['image']['size']){
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if($_FILES['image']['type'] == "image/pjpeg"){
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$im = imagecreatefromjpeg($_FILES['image']['tmp_name']); / Q/ P8 G$ w! f2 y9 {
}elseif($_FILES['image']['type'] == "image/x-png"){ ) j& I* f, G7 C; ~: i& h$ D3 E$ O
$im = imagecreatefrompng($_FILES['image']['tmp_name']); $ K X2 A% n. c' f
}elseif($_FILES['image']['type'] == "image/gif"){ ; X8 w/ U5 R/ v# o
$im = imagecreatefromgif($_FILES['image']['tmp_name']);
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} 2881064151
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if($im){ 5 P7 Z2 e. e% g4 B& @
if(file_exists("$FILENAME.jpg")){ 9 j6 y4 V; a# ^8 J5 u1 D
unlink("$FILENAME.jpg");
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}
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ResizeImage($im,$RESIZEWIDTH,$RESIZEHEIGHT,$FILENAME);
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ImageDestroy ($im);
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}
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} ( n5 t! w" N; M7 x3 u
?>

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