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php图像处理函数大全(缩放、剪裁、缩放、翻转、旋转、透明、锐化的实例)

2015-05-30 22:53 405 查看
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");

1 <?PHP
2 /**
3 * 图片锐化处理
4 * edit by www.jbxue.com
5 */
6 $red= imagecolorallocate($img, 255, 0, 0);
7
8 imageline($img, 0, 0, 100, 100, $red);
9 imageellipse($img, 200, 100, 100, 100, $red);
10 imagegif($img, "./images/map2.gif");
11 imagedestroy($img);
12 图片普通缩放
13 复制代码 代码如下:
14
15 $filename="./images/hee.jpg";
16 $per=0.3;
17 list($width, $height)=getimagesize($filename);
18 $n_w=$width*$per;
19 $n_h=$width*$per;
20 $new=imagecreatetruecolor($n_w, $n_h);
21 $img=imagecreatefromjpeg($filename);
22 //拷贝部分图像并调整
23 imagecopyresized($new, $img,0, 0,0, 0,$n_w, $n_h, $width, $height);
24 //图像输出新图片、另存为
25 imagejpeg($new, "./images/hee2.jpg");
26 imagedestroy($new);
27 imagedestroy($img);
28
29 图片等比例缩放、没处理透明色
30 复制代码 代码如下:
31
32 function thumn($background, $width, $height, $newfile) {
33 list($s_w, $s_h)=getimagesize($background);//获取原图片高度、宽度
34 if ($width && ($s_w < $s_h)) {
35 $width = ($height / $s_h) * $s_w;
36 } else {
37 $height = ($width / $s_w) * $s_h;
38 }
39 $new=imagecreatetruecolor($width, $height);
40 $img=imagecreatefromjpeg($background);
41 imagecopyresampled($new, $img, 0, 0, 0, 0, $width, $height, $s_w, $s_h);
42 imagejpeg($new, $newfile);
43 imagedestroy($new);
44 imagedestroy($img);
45 }
46 thumn("images/hee.jpg", 200, 200, "./images/hee3.jpg");
47
48 gif透明色处理
49 复制代码 代码如下:
50
51 function thumn($background, $width, $height, $newfile) {
52 list($s_w, $s_h)=getimagesize($background);
53 if ($width && ($s_w < $s_h)) {
54 $width = ($height / $s_h) * $s_w;
55 } else {
56 $height = ($width / $s_w) * $s_h;
57 }
58 $new=imagecreatetruecolor($width, $height);
59 $img=imagecreatefromgif($background);
60 $otsc=imagecolortransparent($img);
61 if($otsc >=0 && $otst < imagecolorstotal($img)){//判断索引色
62 $tran=imagecolorsforindex($img, $otsc);//索引颜色值
63 $newt=imagecolorallocate($new, $tran["red"], $tran["green"], $tran["blue"]);
64 imagefill($new, 0, 0, $newt);
65 imagecolortransparent($new, $newt);
66 }
67 imagecopyresized($new, $img, 0, 0, 0, 0, $width, $height, $s_w, $s_h);
68 imagegif($new, $newfile);
69 imagedestroy($new);
70 imagedestroy($img);
71 }
72 thumn("images/map.gif", 200, 200, "./images/map3.gif");


图片裁剪

<?php
/**
* 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

1 <?PHP
2 /**
3 *
4 * 图片添加文字水印
5 */
6
7 function mark_text($background, $text, $x, $y){
8 $back=imagecreatefromjpeg($background);
9 $color=imagecolorallocate($back, 0, 255, 0);
10 imagettftext($back, 20, 0, $x, $y, $color, "simkai.ttf", $text);
11 imagejpeg($back, "./images/hee7.jpg");
12 imagedestroy($back);
13 }
14 mark_text("./images/hee.jpg", "细说PHP", 150, 250);
15 //图片水印
16 function mark_pic($background, $waterpic, $x, $y){
17 $back=imagecreatefromjpeg($background);
18 $water=imagecreatefromgif($waterpic);
19 $w_w=imagesx($water);
20 $w_h=imagesy($water);
21 imagecopy($back, $water, $x, $y, 0, 0, $w_w, $w_h);
22 imagejpeg($back,"./images/hee8.jpg");
23 imagedestroy($back);
24 imagedestroy($water);
25 }
26 mark_pic("./images/hee.jpg", "./images/gaolf.gif", 50, 200);


图片旋转

1 <?PHP
2 /**
3 * 图片旋转
4 * edit by www.jbxue.com
5 */
6 $back=imagecreatefromjpeg("./images/hee.jpg");
7
8 $new=imagerotate($back, 45, 0);
9 imagejpeg($new, "./images/hee9.jpg");
10 ?>


图片水平翻转垂直翻转

1 <?php
2 /**
3 * 图片水平翻转 垂直翻转
4 * edit by www.jbxue.com
5 */
6 function turn_y($background, $newfile){
7
8 $back=imagecreatefromjpeg($background);
9 $width=imagesx($back);
10 $height=imagesy($back);
11 $new=imagecreatetruecolor($width, $height);
12 for($x=0; $x < $width; $x++){
13 imagecopy($new, $back, $width-$x-1, 0, $x, 0, 1, $height);
14 }
15 imagejpeg($new, $newfile);
16 imagedestroy($back);
17 imagedestroy($new);
18 }
19 function turn_x($background, $newfile){
20 $back=imagecreatefromjpeg($background);
21 $width=imagesx($back);
22 $height=imagesy($back);
23 $new=imagecreatetruecolor($width, $height);
24 for($y=0; $y < $height; $y++){
25 imagecopy($new, $back,0, $height-$y-1, 0, $y, $width, 1);
26 }
27 imagejpeg($new, $newfile);
28 imagedestroy($back);
29 imagedestroy($new);
30 }
31 turn_y("./images/hee.jpg", "./images/hee11.jpg");
32 turn_x("./images/hee.jpg", "./images/hee12.jpg");
33 ?>
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