php对图像的各种处理函数代码小结
一、創建圖片資源
imagecreatetruecolor(width,height);
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");
?$red= imagecolorallocate($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
$filename="./images/hee.jpg";
?$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");
總結
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