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            php對圖像的各種處理函數代碼總結

            時間:2024-07-03 23:11:37 PHP 我要投稿
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            php對圖像的各種處理函數代碼總結

              一、創建圖片資源

              imagecreatetruecolor(width,height);

            php對圖像的各種處理函數代碼總結

              imagecreatefromgif(圖片名稱);

              imagecreatefrompng(圖片名稱);

              imagecreatefromjpeg(圖片名稱);畫出各種圖像 imagegif(圖片資源,保存路徑);

              imagepng()

              imagejpeg();

              二、獲取圖片屬性

              imagesx(res//寬度

              imagesy(res//高度

              getimagesize(文件路徑)

              返回一個具有四個單元的數組。索引 0 包含圖像寬度的像素值,索引 1 包含圖像高度的像素值。索引 2 是圖像類型的.標記: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,15 = WBMP,16 = XBM。這些標記與 PHP 4.3.0 新加的 IMAGETYPE 常量對應。索引 3 是文本字符串,內容為“height="yyy" width="xxx"”,可直接用于 IMG 標記。

              銷毀圖像資源

              imagedestroy(圖片資源);

              三、透明處理

              PNG、jpeg透明色都正常,只有gif不正常

              imagecolortransparent(resource image [,int color])//將某個顏色設置成透明色

              imagecolorstotal()

              imagecolorforindex();

              四、圖片的裁剪

              imagecopyresized()

              imagecopyresampled();

              五、加水印(文字、圖片)

              字符串編碼轉換string iconv ( string $in_charset , string $out_charset , string $str )

              六、圖片旋轉

              imagerotate();//制定角度的圖片翻轉

              七、圖片的翻轉

              沿X軸 沿Y軸翻轉

              八、銳化

              imagecolorsforindex()

              imagecolorat()

              在圖片上畫圖形 $img=imagecreatefromgif("./images/map.gif");

              復制代碼 代碼如下:

              $red= imagecolorallocate($img, 255, 0, 0);

              imageline($img, 0, 0, 100, 100, $red);

              imageellipse($img, 200, 100, 100, 100, $red);

              imagegif($img, "./images/map2.gif");

              imagedestroy($img);

              圖片普通縮放

              復制代碼 代碼如下:

              $filename="./images/hee.jpg";

              $per=0.3;

              list($width, $height)=getimagesize($filename);

              $n_w=$width*$per;

              $n_h=$width*$per;

              $new=imagecreatetruecolor($n_w, $n_h);

              $img=imagecreatefromjpeg($filename);

              //拷貝部分圖像并調整

              imagecopyresized($new, $img,0, 0,0, 0,$n_w, $n_h, $width, $height);

              //圖像輸出新圖片、另存為

              imagejpeg($new, "./images/hee2.jpg");

              imagedestroy($new);

              imagedestroy($img);

              圖片等比例縮放、沒處理透明色

              復制代碼 代碼如下:

              function thumn($background, $width, $height, $newfile) {

              list($s_w, $s_h)=getimagesize($background);//獲取原圖片高度、寬度

              if ($width && ($s_w < $s_h)) {

              $width = ($height / $s_h) * $s_w;

              } else {

              $height = ($width / $s_w) * $s_h;

              }

              $new=imagecreatetruecolor($width, $height);

              $img=imagecreatefromjpeg($background);

              imagecopyresampled($new, $img, 0, 0, 0, 0, $width, $height, $s_w, $s_h);

              imagejpeg($new, $newfile);

              imagedestroy($new);

              imagedestroy($img);

              }

              thumn("images/hee.jpg", 200, 200, "./images/hee3.jpg");

              gif透明色處理

              復制代碼 代碼如下:

              function thumn($background, $width, $height, $newfile) {

              list($s_w, $s_h)=getimagesize($background);

              if ($width && ($s_w < $s_h)) {

              $width = ($height / $s_h) * $s_w;

              } else {

              $height = ($width / $s_w) * $s_h;

              }

              $new=imagecreatetruecolor($width, $height);

              $img=imagecreatefromgif($background);

              $otsc=imagecolortransparent($img);

              if($otsc >=0 && $otst < imagecolorstotal($img)){//判斷索引色

              $tran=imagecolorsforindex($img, $otsc);//索引顏色值

              $newt=imagecolorallocate($new, $tran["red"], $tran["green"], $tran["blue"]);

              imagefill($new, 0, 0, $newt);

              imagecolortransparent($new, $newt);

              }

              imagecopyresized($new, $img, 0, 0, 0, 0, $width, $height, $s_w, $s_h);

              imagegif($new, $newfile);

              imagedestroy($new);

              imagedestroy($img);

              }

              thumn("images/map.gif", 200, 200, "./images/map3.gif");

              圖片裁剪

              復制代碼 代碼如下:

              function cut($background, $cut_x, $cut_y, $cut_width, $cut_height, $location){

              $back=imagecreatefromjpeg($background);

              $new=imagecreatetruecolor($cut_width, $cut_height);

              imagecopyresampled($new, $back, 0, 0, $cut_x, $cut_y, $cut_width, $cut_height,$cut_width,$cut_height);

              imagejpeg($new, $location);

              imagedestroy($new);

              imagedestroy($back);

              }

              cut("./images/hee.jpg", 440, 140, 117, 112, "./images/hee5.jpg");

              圖片加水印

              文字水印

              復制代碼 代碼如下:

              function mark_text($background, $text, $x, $y){

              $back=imagecreatefromjpeg($background);

              $color=imagecolorallocate($back, 0, 255, 0);

              imagettftext($back, 20, 0, $x, $y, $color, "simkai.ttf", $text);

              imagejpeg($back, "./images/hee7.jpg");

              imagedestroy($back);

              }

              mark_text("./images/hee.jpg", "細說PHP", 150, 250);

              //圖片水印

              function mark_pic($background, $waterpic, $x, $y){

              $back=imagecreatefromjpeg($background);

              $water=imagecreatefromgif($waterpic);

              $w_w=imagesx($water);

              $w_h=imagesy($water);

              imagecopy($back, $water, $x, $y, 0, 0, $w_w, $w_h);

              imagejpeg($back,"./images/hee8.jpg");

              imagedestroy($back);

              imagedestroy($water);

              }

              mark_pic("./images/hee.jpg", "./images/gaolf.gif", 50, 200);

              圖片旋轉

              復制代碼 代碼如下:

              $back=imagecreatefromjpeg("./images/hee.jpg");

              $new=imagerotate($back, 45, 0);

              imagejpeg($new, "./images/hee9.jpg");

              圖片水平翻轉垂直翻轉

              復制代碼 代碼如下:

              function turn_y($background, $newfile){

              $back=imagecreatefromjpeg($background);

              $width=imagesx($back);

              $height=imagesy($back);

              $new=imagecreatetruecolor($width, $height);

              for($x=0; $x < $width; $x++){

              imagecopy($new, $back, $width-$x-1, 0, $x, 0, 1, $height);

              }

              imagejpeg($new, $newfile);

              imagedestroy($back);

              imagedestroy($new);

              }

              function turn_x($background, $newfile){

              $back=imagecreatefromjpeg($background);

              $width=imagesx($back);

              $height=imagesy($back);

              $new=imagecreatetruecolor($width, $height);

              for($y=0; $y < $height; $y++){

              imagecopy($new, $back,0, $height-$y-1, 0, $y, $width, 1);

              }

              imagejpeg($new, $newfile);

              imagedestroy($back);

              imagedestroy($new);

              }

              turn_y("./images/hee.jpg", "./images/hee11.jpg");

              turn_x("./images/hee.jpg", "./images/hee12.jpg");

              圖片銳化

              復制代碼 代碼如下:

              function sharp($background, $degree, $save){

              $back=imagecreatefromjpeg($background);

              $b_x=imagesx($back);

              $b_y=imagesy($back);

              $dst=imagecreatefromjpeg($background);

              for($i=0; $i<$b_x; $i++){

              for($j=0; $j<$b_y; $j++){

              $b_clr1=imagecolorsforindex($back, imagecolorat($back, $i-1, $j-1));前一個像素顏色數組

              $b_clr2=imagecolorsforindex($back, imagecolorat($back, $i, $j));取出當前顏色數組

              $r=intval($b_clr2["red"]+$degree*($b_clr2["red"]-$b_clr1["red"]));加深

              $g=intval($b_clr2["green"]+$degree*($b_clr2["green"]-$b_clr1["green"]));

              $b=intval($b_clr2["blue"]+$degree*($b_clr2["blue"]-$b_clr1["blue"]));

              $r=min(255, max($r, 0));//限制r范圍在0-255之間

              $g=min(255, max($g, 0));

              $b=min(255, max($b, 0));

              if(($d_clr=imagecolorexact($dst, $r, $g, $b))==-1){//等于1不在顏色范圍內

              $d_clr=Imagecolorallocate($dst, $r, $g, $b);//創建一個顏色

              }

              imagesetpixel($dst, $i, $j, $d_clr);

              }

              }

              imagejpeg($dst, $save);

              imagedestroy($back);

              imagedestroy($dst);

              }

              sharp("./images/hee.jpg", 20, "./images/hee13.jpg");

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