php影像處理函數範例匯總，php圖片函數實例程式碼

imagecolorsforindex()
imagecolorat()
圖片上畫出圖形$img=imagecreatefromgif("./images/map. gif");
/**
* 圖片銳利化處理
* 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);

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圖片普通縮放






function thumn($background, $width, $height, $newfile) {
list($s_w, $s_h)=getget );//取得原始圖片高度、寬度
if ($width && ($s_w $width = ($height / $s_h) * $s_w;

$new=imagecreatetruecolor($width, $height);

$img=imagecreatefromjpeg($background);$img=imagecreatefromjpeg($background);imagecopyresampled($new, $img, 0, 0, 0, 0, $width, $height, $s_w, $s_h);imagejpeg($new, $newfile);

imagedestroy($new) ;

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gif透明色處理







/**
* 圖片裁切處理
* edit by bbs.it-home.org

imagecopyresampled($new, $back, 0, 0, $cut_x, $cut_y, $cut_width, $cut_height,$cut_width,$cut_height);

imagejpeg($new, $location);imagedestroy($back);}

cut("./images/hee.jpg", 440, 140, 117, 112, "./images/hee5.jpg" );

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圖片加水印文字浮水印







/**
*
* 圖片加入文字浮水印
*/
function mark_text ($background, $text, $x, $y){
$back=imagecreatefromjpeg($background);
$color=imagecolorallocate($back, 0, 255, 0);
imagettftext($back, 0, 255, 0);
imagettftext($ back, 20, 0, $x, $y, $color, "simkai.ttf", $text);
imagejpeg($back, "./images/hee7.jpg");
imagedestroy($ back);
}
mark_text("./images/hee.jpg", "細說PHP", 150, 250);
//圖片浮水印

$w_h =imagesy($water);

imagecopy($back, $water, $x, $y, 0, 0, $w_w, $w_h);imagejpeg($back,"./images/hee8. jpg");imagedestroy($back);

imagedestroy($water);

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圖片旋轉

* 圖片旋轉* edit by bbs.it-home.org*/$back=imagecreatefromjpeg(". /hee.jpg");

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

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圖片水平導航 垂直導航

/**
* 圖片水平翻轉 垂直翻轉
* edit by bbs.it-home.org
*/
函數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($new);
}
函數turn_x($background, $newfile){
$back=imagecreatefromjpeg($background);
$width=imagesx($back);
$height=imagesy($width=imagesx($back);
$height=imagesy($回);
$new=imagecreatetruecolor($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");
?>