代码如下 | 复制代码 |
<?php /**
var $BUF = Array ( ); var $ERR = Array ( for ($i = 0, $src_count = count($GIF_src); $i < $src_count; $i++ ) $Locals_str = 13 + 3 * (2 <<(ord($this->BUF[$i]{10}) & 0x07)); $Locals_end = strlen($this->BUF[$i]) - $Locals_str - 1; $Global_len = 2 << (ord( $this->BUF [0]{10} ) & 0x07 ); $Global_rgb = substr($this->BUF[0], 13, 3 * (2 << ( ord ( $this->BUF[0]{10} ) & 0x07))); $Locals_ext = "!xF9x04" . chr(($this->DIS << 2) + 0) . chr(($d >> 0) & 0xFF) . chr(($d >> 8) & 0xFF) . "x0x0"; if ( $this->COL > -1 && ord($this->BUF[$i]{10}) & 0x80) |
//使用如下类就可以生成图片缩略图,
代码如下 | 复制代码 |
<?php function resizeimage($img, $wid, $hei,$c,$dstpath) //初始化图象 >resize_height, (($this->height)*$resize_ratio), $this->height); >resize_height, $this->width, (($this->width)/$resize_ratio)); >resize_width)/$ratio, $this->width, $this->height); $this->resize_height, $this->width, $this->height); $type_length = strlen($this->type);
类的调用方法 $resizeimage = new resizeimage("图片源文件地址", "200", "100", "0","缩略图地址"); |
//就只用上面的一句话,就能生成缩略图,其中,源文件和缩略图地址可以相同,200,100分别代表宽和高
实例2
PHP缩略图 等比例无损压缩,可填充空白区域补充色
代码如下 | 复制代码 |
<?php // 测试 /* imagecopyresampled($dstimg, $srcimg, $dst_x
function str2hex( $str ) { // BMP 创建函数 php本身无 $FILE = unpack("vfile_type/Vfile_size/Vreserved/Vbitmap_offset", fread($f1,14)); $BMP = unpack('Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel'. $res = imagecreatetruecolor($BMP['width'],$BMP['height']); return $res; ?> |
总结,第一个类文件不如第二个好,因为第一个生成图之后图片会有点变模糊哦,后面这个生成类是高质量的。
一个PHP智能把图片生成缩略图类,可自动根据你图片的大小生成等比例的图片哦,有需要的朋友可参考参考。代码如下 | 复制代码 |
< ?php /*************************************** *作者:落梦天蝎(beluckly) *完成时间:2006-12-18 *类名:CreatMiniature *功能:生成多种类型的缩略图 *基本参数:$srcFile,$echoType *方法用到的参数: $toFile,生成的文件 $toW,生成的宽 $toH,生成的高 $bk1,背景颜色参数 以255为最高 $bk2,背景颜色参数 $bk3,背景颜色参数 *例子: include("thumb.php"); $cm=new CreatMiniature(); $cm->SetVar("1.jpg","file"); $cm->Distortion("dis_bei.jpg",150,200); $cm->Prorate("pro_bei.jpg",150,200); $cm->Cut("cut_bei.jpg",150,200); $cm->BackFill("fill_bei.jpg",150,200); ***************************************/ class CreatMiniature { //公共变量 var $srcFile=""; //原图 var $echoType; //输出图片类型,link--不保存为文件;file--保存为文件 var $im=""; //临时变量 var $srcW=""; //原图宽 var $srcH=""; //原图高 //设置变量及初始化 function SetVar($srcFile,$echoType) { $this->srcFile=$srcFile; $this->echoType=$echoType; $info = ""; $data = GetImageSize($this->srcFile,$info); switch ($data[2]) { case 1: if(!function_exists("imagecreatefromgif")){ echo "你的GD库不能使用GIF格式的图片,请使用Jpeg或PNG格式!<a href='javascript:go(-1);'>返回</a>"; exit(); } $this->im = ImageCreateFromGIF($this->srcFile); break; case 2: if(!function_exists("imagecreatefromjpeg")){ echo "你的GD库不能使用jpeg格式的图片,请使用其它格式的图片!<a href='javascript:go(-1);'>返回</a>"; exit(); } $this->im = ImageCreateFromJpeg($this->srcFile); break; case 3: $this->im = ImageCreateFromPNG($this->srcFile); break; } $this->srcW=ImageSX($this->im); $this->srcH=ImageSY($this->im); } //生成扭曲型缩图 function Distortion($toFile,$toW,$toH) { $cImg=$this->CreatImage($this->im,$toW,$toH,0,0,0,0,$this->srcW,$this->srcH); return $this->EchoImage($cImg,$toFile); ImageDestroy($cImg); } //生成按比例缩放的缩图 function Prorate($toFile,$toW,$toH) { $toWH=$toW/$toH; $srcWH=$this->srcW/$this->srcH; if($toWH< =$srcWH) { $ftoW=$toW; $ftoH=$ftoW*($this->srcH/$this->srcW); } else { $ftoH=$toH; $ftoW=$ftoH*($this->srcW/$this->srcH); } if($this->srcW>$toW||$this->srcH>$toH) { $cImg=$this->CreatImage($this->im,$ftoW,$ftoH,0,0,0,0,$this->srcW,$this->srcH); return $this->EchoImage($cImg,$toFile); ImageDestroy($cImg); } else { $cImg=$this->CreatImage($this->im,$this->srcW,$this->srcH,0,0,0,0,$this->srcW,$this->srcH); return $this->EchoImage($cImg,$toFile); ImageDestroy($cImg); } } //生成最小裁剪后的缩图 function Cut($toFile,$toW,$toH) { $toWH=$toW/$toH; $srcWH=$this->srcW/$this->srcH; if($toWH< =$srcWH) { $ctoH=$toH; $ctoW=$ctoH*($this->srcW/$this->srcH); } else { $ctoW=$toW; $ctoH=$ctoW*($this->srcH/$this->srcW); } $allImg=$this->CreatImage($this->im,$ctoW,$ctoH,0,0,0,0,$this->srcW,$this->srcH); $cImg=$this->CreatImage($allImg,$toW,$toH,0,0,($ctoW-$toW)/2,($ctoH-$toH)/2,$toW,$toH); return $this->EchoImage($cImg,$toFile); ImageDestroy($cImg); ImageDestroy($allImg); } //生成背景填充的缩图 function BackFill($toFile,$toW,$toH,$bk1=255,$bk2=255,$bk3=255) { $toWH=$toW/$toH; $srcWH=$this->srcW/$this->srcH; if($toWH< =$srcWH) { $ftoW=$toW; $ftoH=$ftoW*($this->srcH/$this->srcW); } else { $ftoH=$toH; $ftoW=$ftoH*($this->srcW/$this->srcH); } if(function_exists("imagecreatetruecolor")) { @$cImg=ImageCreateTrueColor($toW,$toH); if(!$cImg) { $cImg=ImageCreate($toW,$toH); } } else { $cImg=ImageCreate($toW,$toH); } $backcolor = imagecolorallocate($cImg, $bk1, $bk2, $bk3); //填充的背景颜色 ImageFilledRectangle($cImg,0,0,$toW,$toH,$backcolor); if($this->srcW>$toW||$this->srcH>$toH) { $proImg=$this->CreatImage($this->im,$ftoW,$ftoH,0,0,0,0,$this->srcW,$this->srcH); /* if($ftoW< $toW) { ImageCopyMerge($cImg,$proImg,($toW-$ftoW)/2,0,0,0,$ftoW,$ftoH,100); } else if($ftoH<$toH) { ImageCopyMerge($cImg,$proImg,0,($toH-$ftoH)/2,0,0,$ftoW,$ftoH,100); } */ if($ftoW<$toW) { ImageCopy($cImg,$proImg,($toW-$ftoW)/2,0,0,0,$ftoW,$ftoH); } else if($ftoH<$toH) { ImageCopy($cImg,$proImg,0,($toH-$ftoH)/2,0,0,$ftoW,$ftoH); } else { ImageCopy($cImg,$proImg,0,0,0,0,$ftoW,$ftoH); } } else { ImageCopyMerge($cImg,$this->im,($toW-$ftoW)/2,($toH-$ftoH)/2,0,0,$ftoW,$ftoH,100); } return $this->EchoImage($cImg,$toFile); ImageDestroy($cImg); } function CreatImage($img,$creatW,$creatH,$dstX,$dstY,$srcX,$srcY,$srcImgW,$srcImgH) { if(function_exists("imagecreatetruecolor")) { @$creatImg = ImageCreateTrueColor($creatW,$creatH); if($creatImg) ImageCopyResampled($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH); else { $creatImg=ImageCreate($creatW,$creatH); ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH); } } else { $creatImg=ImageCreate($creatW,$creatH); ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH); } return $creatImg; } //输出图片,link---只输出,不保存文件。file--保存为文件 function EchoImage($img,$to_File) { switch($this->echoType) { case "link": if(function_exists('imagejpeg')) return ImageJpeg($img); else return ImagePNG($img); break; case "file": if(function_exists('imagejpeg')) return ImageJpeg($img,$to_File); else return ImagePNG($img,$to_File); break; } } } ?> |
创建图像缩略图需要许多时间,此代码将有助于了解缩略图的逻辑。
代码如下 | 复制代码 |
if($ext == "jpg" || $ext == "jpeg") $x = imagesx($im); if($x <= $xmax && $y <= $ymax) if($x >= $y) { $im2 = imagecreatetruecolor($newx, $newy); |
例2
代码如下 | 复制代码 |
function creat_thumbnail($img,$w,$h,$path) //是真彩色图像 |
代码如下 | 复制代码 |
class resizeimage $this->type = strtolower(substr(strrchr($this->srcimg,"."),1)); $name = substr($this->srcimg,0,$name_length-1); //echo $this->dstimg; $resizeimage = new resizeimage("11.jpg", "200", "150", "1","17.jpg"); |
实例二
代码如下 | 复制代码 |
<?php /** $dst_h = $height; /** if(!$width && !$height && !$proportion) $src = $createfun($src_img); if(function_exists('imagecopyresampled')) |
使用方法
代码如下 | 复制代码 |
$src_img = "./ROSI_050_002.JPG"; |