PHP一般情况下生成的缩略图都比较不理想 - cncml手绘网

<?php ' M( l- @! y4 ^- I9 \/ }& t) j% F
$FILENAME="image.thumb"; - P1 d9 v* C9 `5 v
// 生成图片的宽度 , X$ L4 G! n$ H6 |
$RESIZEWIDTH=400; . `. ]+ b/ _ f+ d* ~2 J. G
// 生成图片的高度 1 {* J$ `* j- t" x8 p0 \* ]& S
$RESIZEHEIGHT=400;& z7 e7 q( p; `2 \, p
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function ResizeImage($im,$maxwidth,$maxheight,$name){
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$width = imagesx($im); ) K3 t8 k1 J u- Z$ q' D; ~* P( F# A
$height = imagesy($im); $ X/ o# b+ T' R2 b1 i! p
if(($maxwidth && $width > $maxwidth) || ($maxheight && $height > $maxheight)){ # ]0 x! V: c1 Q8 Y
if($maxwidth && $width > $maxwidth){ 5 l2 v, I( l6 m, I3 ?& p+ Q
$widthratio = $maxwidth/$width; 9 M3 Y. E; w8 f# M3 q) w4 x
$RESIZEWIDTH=true;
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}
# l1 I% ~/ o* |4 u
if($maxheight && $height > $maxheight){
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$heightratio = $maxheight/$height; ; _( s' j9 ^4 W$ C: D( }$ l
$RESIZEHEIGHT=true; - d; [# _3 g: x: q1 D
} , n+ {0 c1 P( t* }/ s. ?6 c
if($RESIZEWIDTH && $RESIZEHEIGHT){
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if($widthratio < $heightratio){ 8 e2 s- w% z. u! K& _
$ratio = $widthratio; ( f U! _6 ~0 l
}else{
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$ratio = $heightratio;
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} 9 Q6 v3 [) q% d- J; b, s( C
}elseif($RESIZEWIDTH){
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$ratio = $widthratio; - j: v( _! u( Y7 d! A* `! K
}elseif($RESIZEHEIGHT){ . R8 Z7 @6 r0 P8 g' ^" d/ r
$ratio = $heightratio;
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$newwidth = $width * $ratio;
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$newheight = $height * $ratio; . E1 S+ Y; z& J* T3 G' e3 c$ k
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, $height);
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}else{
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$newim = imagecreate($newwidth, $newheight);
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imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); 5 W% N2 }1 N: @5 D
} ( b7 v q' d8 X6 O. i4 r
ImageJpeg ($newim,$name . ".jpg"); $ r1 P0 i% b$ f3 O' O
ImageDestroy ($newim); + N+ r7 {, ]. g) g& l5 L& N
}else{ $ n9 S( {, M) U1 h5 J# U
ImageJpeg ($im,$name . ".jpg");
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}
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}
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if($_FILES['image']['size']){ 8 y* o9 D: Y b F% H
if($_FILES['image']['type'] == "image/pjpeg"){ ) w4 F a! ]/ U: D
$im = imagecreatefromjpeg($_FILES['image']['tmp_name']); $ N. q4 G7 v g# h6 w3 S
}elseif($_FILES['image']['type'] == "image/x-png"){
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$im = imagecreatefrompng($_FILES['image']['tmp_name']);
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}elseif($_FILES['image']['type'] == "image/gif"){ 9 J5 ]) D" Y! c& @' m
$im = imagecreatefromgif($_FILES['image']['tmp_name']); . y+ @( `) E4 X% d3 C
} 2881064151% _2 H! f2 D9 x- e
if($im){ 0 i2 }; x% v3 c! N
if(file_exists("$FILENAME.jpg")){
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unlink("$FILENAME.jpg"); 8 n% z0 W! T* A( V3 ~7 g E
}
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ResizeImage($im,$RESIZEWIDTH,$RESIZEHEIGHT,$FILENAME); , ]" L% n1 U& u2 l, h {/ s
ImageDestroy ($im);
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} . y) R8 D; Y/ ^2 X
} 4 |, x" t3 D7 D
?>

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