Summary of PHP image processing function examples, PHP image function example code

imagecolorsforindex()
imagecolorat()
Draw graphics on the picture $img=imagecreatefromgif("./images/map.gif");
< ;?PHP
/**
* Image sharpening process
* edit by bbs.it-home.org
*/
$red= imagecolorallocate($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);
 < /p>

Normal zoom of pictures

function thumn($background, $width, $height, $newfile) {
list($s_w, $s_h)=getimagesize($background);//Get the original image height and width
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 transparent color processing

/**
* Image cropping process
* edit by bbs.it-home.org
*/
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");
?>

Image watermark text watermark

/**
*
* Add text watermark to pictures
*/
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($back);
}
mark_text("./images/hee.jpg", "Details on PHP", 150, 250);
//Image watermark
function mark_pic($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);

Picture rotation

/**
* Image rotation
* edit by bbs.it-home.org
*/
$back=imagecreatefromjpeg("./images/hee.jpg");
imagejpeg($new, "./images/hee9.jpg");
?>

图片水平翻转垂直翻转

/**
* Flip the picture horizontally Flip it vertically
* edit by bbs.it-home.org
*/
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");
?>