php图像处理函数大全(缩放、剪裁、缩放、翻转、旋转、透明、锐化的实例总结)

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。

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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