php对图像的各种处理函数代码小结

php对图像的各种处理函数代码小结

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");

复制代码 代码如下:

$red= imagecolorallocate($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);

图片普通缩放

复制代码 代码如下:

$filename="./images/hee.jpg";

$per=0.3;

list($width, $height)=getimagesize($filename);

$n_w=$width*$per;

$n_h=$width*$per;

$new=imagecreatetruecolor($n_w, $n_h);

$img=imagecreatefromjpeg($filename);

//拷贝部分图像并调整

imagecopyresized($new, $img,0, 0,0, 0,$n_w, $n_h, $width, $height);

//图像输出新图片、另存为

imagejpeg($new, "./images/hee2.jpg");

imagedestroy($new);

imagedestroy($img);

图片等比例缩放、没处理透明色

复制代码 代码如下:

function thumn($background, $width, $height, $newfile) {

list($s_w, $s_h)=getimagesize($background);//获取原图片高度、宽度

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透明色处理

复制代码 代码如下:

function thumn($background, $width, $height, $newfile) {

list($s_w, $s_h)=getimagesize($background);

if ($width && ($s_w < $s_h)) {

$width = ($height / $s_h) * $s_w;

} else {

$height = ($width / $s_w) * $s_h;

}

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

$img=imagecreatefromgif($background);

$otsc=imagecolortransparent($img);

if($otsc >=0 && $otst < imagecolorstotal($img)){//判断索引色

$tran=imagecolorsforindex($img, $otsc);//索引颜色值

$newt=imagecolorallocate($new, $tran["red"], $tran["green"], $tran["blue"]);

imagefill($new, 0, 0, $newt);

imagecolortransparent($new, $newt);

}

imagecopyresized($new, $img, 0, 0, 0, 0, $width, $height, $s_w, $s_h);

imagegif($new, $newfile);

imagedestroy($new);

imagedestroy($img);

}

thumn("images/map.gif", 200, 200, "./images/map3.gif");

图片裁剪

复制代码 代码如下:

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

复制代码 代码如下:

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", "细说PHP", 150, 250);

//图片水印

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);

图片旋转

复制代码 代码如下:

$back=imagecreatefromjpeg("./images/hee.jpg");

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

imagejpeg($new, "./images/hee9.jpg");

图片水平翻转垂直翻转

复制代码 代码如下:

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");

图片锐化

复制代码 代码如下:

function sharp($background, $degree, $save){

$back=imagecreatefromjpeg($background);

$b_x=imagesx($back);

$b_y=imagesy($back);

$dst=imagecreatefromjpeg($background);

for($i=0; $i<$b_x; $i++){

for($j=0; $j<$b_y; $j++){

$b_clr1=imagecolorsforindex($back, imagecolorat($back, $i-1, $j-1));前一个像素颜色数组

$b_clr2=imagecolorsforindex($back, imagecolorat($back, $i, $j));取出当前颜色数组

$r=intval($b_clr2["red"]+$degree*($b_clr2["red"]-$b_clr1["red"]));加深

$g=intval($b_clr2["green"]+$degree*($b_clr2["green"]-$b_clr1["green"]));

$b=intval($b_clr2["blue"]+$degree*($b_clr2["blue"]-$b_clr1["blue"]));

$r=min(255, max($r, 0));//限制r范围在0-255之间

$g=min(255, max($g, 0));

$b=min(255, max($b, 0));

if(($d_clr=imagecolorexact($dst, $r, $g, $b))==-1){//等于1不在颜色范围内

$d_clr=Imagecolorallocate($dst, $r, $g, $b);//创建一个颜色

}

imagesetpixel($dst, $i, $j, $d_clr);

}

}

imagejpeg($dst, $save);

imagedestroy($back);

imagedestroy($dst);

}

sharp("./images/hee.jpg", 20, "./images/hee13.jpg");