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用GD库生成高质量的缩略图片[转载]
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[
2005-7-16 14:44 | by
张宴
]
$FILENAME="image_name"; // 生成图片的宽度 $RESIZEWIDTH=400; // 生成图片的高度 $RESIZEHEIGHT=400; function ResizeImage($im,$maxwidth,$maxheight,$name){ $width = imagesx($im); $height = imagesy($im); if(($maxwidth && $width > $maxwidth) || ($maxheight && $height > $maxheight)){ if($maxwidth && $width > $maxwidth){ $widthratio = $maxwidth/$width; $RESIZEWIDTH=true; } if($maxheight && $height > $maxheight){ $heightratio = $maxheight/$height; $RESIZEHEIGHT=true; } if($RESIZEWIDTH && $RESIZEHEIGHT){ if($widthratio < $heightratio){ $ratio = $widthratio; }else{ $ratio = $heightratio; } }elseif($RESIZEWIDTH){ $ratio = $widthratio; }elseif($RESIZEHEIGHT){ $ratio = $heightratio; } $newwidth = $width * $ratio; $newheight = $height * $ratio; if(function_exists("imagecopyresampled")){ $newim = imagecreatetruecolor($newwidth, $newheight); imagecopyresampled($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); }else{ $newim = imagecreate($newwidth, $newheight); imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); } ImageJpeg ($newim,$name . ".jpg"); ImageDestroy ($newim); }else{ ImageJpeg ($im,$name . ".jpg"); } } if($_FILES['image']['size']){ if($_FILES['image']['type'] == "image/pjpeg"){ $im = imagecreatefromjpeg($_FILES['image']['tmp_name']); }elseif($_FILES['image']['type'] == "image/x-png"){ $im = imagecreatefrompng($_FILES['image']['tmp_name']); }elseif($_FILES['image']['type'] == "image/gif"){ $im = imagecreatefromgif($_FILES['image']['tmp_name']); } if($im){ if(file_exists("$FILENAME.jpg")){ unlink("$FILENAME.jpg"); } ResizeImage($im,$RESIZEWIDTH,$RESIZEHEIGHT,$FILENAME); ImageDestroy ($im); } } ?>
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