Home > php教程 > php手册 > body text

php图像处理函数大全

WBOY
Release: 2016-06-13 11:32:35
Original
1170 people have browsed it

php图片处理代码分享,包括缩放、剪裁、缩放、翻转、旋转、透明、锐化等。需要的朋友可以参考下  

一、创建图片资源
imagecreatetruecolor(width,height);
imagecreatefromgif(图片名称);
imagecreatefrompng(图片名称);
imagecreatefromjpeg(图片名称);画出各种图像 imagegif(图片资源,保存路径);
imagepng()
imagejpeg();

二、获取图片属性
imagesx(res//宽度
imagesy(res//高度
getimagesize(文件路径)
返 回一个具有四个单元的数组。索引 0 包含图像宽度的像素值,索引 1 包含图像高度的像素值。索引 2 是图像类型的标记: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。这些标记与 PHP 4.3.0 新加的 IMAGETYPE 常量对应。索引 3 是文本字符串,内容为“height="yyy" width="xxx"”,可直接用于 IMG 标记。
销毁图像资源
imagedestroy(图片资源);

三、透明处理
PNG、jpeg透明色都正常,只有gif不正常
imagecolortransparent(resource image [,int color])//将某个颜色设置成透明色
imagecolorstotal()
imagecolorforindex();

四、图片的裁剪
imagecopyresized()
imagecopyresampled();

五、加水印(文字、图片)
字符串编码转换string iconv ( string $in_charset , string $out_charset , string $str )

六、图片旋转
imagerotate();//制定角度的图片翻转

七、图片的翻转
沿X轴 沿Y轴翻转

八、锐化
imagecolorsforindex()
imagecolorat()
在图片上画图形 $img=imagecreatefromgif("./images/map.gif");

复制代码 代码如下:
 /**
 * 图片锐化处理
 */
 $red= imagecolorallocate($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);
 图片普通缩放
 代码如下:

 $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);
 //拷贝部分图像并调整
 imagecopyresized($new, $img,0, 0,0, 0,$n_w, $n_h, $width, $height);
 //图像输出新图片、另存为
 imagejpeg($new, "./images/hee2.jpg");
 imagedestroy($new);
 imagedestroy($img);

 图片等比例缩放、没处理透明色
 代码如下:
 function thumn($background, $width, $height, $newfile) {
 list($s_w, $s_h)=getimagesize($background);//获取原图片高度、宽度
 if ($width && ($s_w  $width = ($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透明色处理
 代码如下:
 function thumn($background, $width, $height, $newfile) {
 list($s_w, $s_h)=getimagesize($background);
 if ($width && ($s_w  $width = ($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  $tran=imagecolorsforindex($img, $otsc);//索引颜色值
 $newt=imagecolorallocate($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");


图片裁剪

复制代码 代码如下:
/**
* 图片裁剪处理
* edit by www.jbxue.com
*/
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");
?>


图片加水印 文字水印

复制代码 代码如下:
 /**
 *
 * 图片添加文字水印
 */

 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($back);
 }
 mark_text("./images/hee.jpg", "细说PHP", 150, 250);
 //图片水印
 function mark_pic($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);


图片旋转

复制代码 代码如下:
 /**
 * 图片旋转
 */
 $back=imagecreatefromjpeg("./images/hee.jpg");

 $new=imagerotate($back, 45, 0);
 imagejpeg($new, "./images/hee9.jpg");
 ?>


图片水平翻转垂直翻转

复制代码 代码如下:


 /**
 * 图片水平翻转 垂直翻转
 */
 function turn_y($background, $newfile){
 $back=imagecreatefromjpeg($background);
 $width=imagesx($back);
 $height=imagesy($back);
 $new=imagecreatetruecolor($width, $height);
 for($x=0; $x  imagecopy($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; $y  imagecopy($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");
 ?>

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Recommendations
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn:Public welfare online PHP training,Help PHP learners grow quickly!