php图像处理函数例子汇总，php图片函数实例代码

3. imagecolorsforindex()

4. imagecolorat()
5. 在图片上画图形 $img=imagecreatefromgif("./images/map.gif");

6. /**

7. * 图片锐化处理
8. * edit by bbs.it-home.org
9. */
10. $red= imagecolorallocate($img, 255, 0, 0);

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

12. imageellipse($img, 200, 100, 100, 100, $red);
13. imagegif($img, "./images/map2.gif");
14. imagedestroy($img);

图片普通缩放

2. function thumn($background, $width, $height, $newfile) {
3. list($s_w, $s_h)=getimagesize($background);//获取原图片高度、宽度
4. if ($width && ($s_w < $s_h)) {
5. $width = ($height / $s_h) * $s_w;
6. } else {
7. $height = ($width / $s_w) * $s_h;
8. }
9. $new=imagecreatetruecolor($width, $height);
10. $img=imagecreatefromjpeg($background);
11. imagecopyresampled($new, $img, 0, 0, 0, 0, $width, $height, $s_w, $s_h);
12. imagejpeg($new, $newfile);
13. imagedestroy($new);
14. imagedestroy($img);
15. }
16. thumn("images/hee.jpg", 200, 200, "./images/hee3.jpg");

gif透明色处理

3. /**

4. * 图片裁剪处理
5. * edit by bbs.it-home.org
6. */

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

8. $back=imagecreatefromjpeg($background);
9. $new=imagecreatetruecolor($cut_width, $cut_height);
10. imagecopyresampled($new, $back, 0, 0, $cut_x, $cut_y, $cut_width, $cut_height,$cut_width,$cut_height);
11. imagejpeg($new, $location);
12. imagedestroy($new);
13. imagedestroy($back);
14. }
15. cut("./images/hee.jpg", 440, 140, 117, 112, "./images/hee5.jpg");
16. ?>

图片加水印 文字水印

3. /**

4. *
5. * 图片添加文字水印
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

3. /**

4. * 图片旋转
5. * edit by bbs.it-home.org
6. */
7. $back=imagecreatefromjpeg("./images/hee.jpg");

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

9. imagejpeg($new, "./images/hee9.jpg");
10. ?>

图片水平翻转垂直翻转

3. /**

4. * 图片水平翻转 垂直翻转
5. * edit by bbs.it-home.org
6. */
7. function turn_y($background, $newfile){

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. ?>