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php图像处理(缩放、剪裁、缩放、翻转、旋转、透明、锐化)

程序员文章站 2022-06-13 11:14:03
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本文章来给各同学总结了一些常用的图像处理函数,包括有缩放、剪裁、缩放、翻转、旋转、透明、锐化功能,大家可参考参考。


注意事项:如果要使用php gd处理我们需要开启gd库


Windows下开启PHP的GD库支持

找到php.ini,打开内容,找到:

;extension=php_gd2.dll

把最前面的分号“;”去掉,再保存即可,如果本来就没有分号,那就是已经开启了。


linux开启GD库


##检测GD库是否安装命令
php5 -m | grep -i gd
或者
php -i | grep -i --color gd
##如未安装GD库,则为服务器安装,方法如下
### 如果是源码安装,则加入参数
--with-gd
### 如果是debian系的linux系统,用apt-get安装,如下
apt-get install php5-gd
### 如果是CentOS系的系统,用yum安装,如下
yum install php-gd
### 如果是suse系的linux系统,用yast安装,如下
yast -i php5_gd


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");
$red= imagecolorallocate($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

$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

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 $width = ($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

function thumn($background, $width, $height, $newfile) {
list($s_w, $s_h)=getimagesize($background);

if ($width && ($s_w $width = ($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 $tran=imagecolorsforindex($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

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

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

$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

function 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);
}

function turn_x($background, $newfile){
$back=imagecreatefromjpeg($background);

$width=imagesx($back);
$height=imagesy($back);

$new=imagecreatetruecolor($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"); 图片锐化

function sharp($background, $degree, $save){
$back=imagecreatefromjpeg($background);

$b_x=imagesx($back);
$b_y=imagesy($back);

$dst=imagecreatefromjpeg($background);
for($i=0; $i for($j=0; $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");十月 26th, 2011No comments yet真诚待 php设计实现和应用验证码类
validationcode.class.php

/* 开发一个验证码类
*
* 1. 什么是验证码
*
* 2. 验证码的作用
*
* 3. 编写验证码类(PHP图像处理)
*
* 4. 使用验证码
*
*
*/ class ValidationCode {
private $width;
private $height;
private $codeNum;
private $image; //图像资源
private $disturbColorNum;
private $checkCode;

function __construct($width=80, $height=20, $codeNum=4){
$this->width=$width;
$this->height=$height;
$this->codeNum=$codeNum;
$this->checkCode=$this->createCheckCode();
$number=floor($width*$height/15);

if($number > 240-$codeNum){
$this->disturbColorNum= 240-$codeNum;
}else{
$this->disturbColorNum=$number;
}

}
//通过访问该方法向浏览器中输出图像
function showImage($fontFace=""){
//第一步:创建图像背景
$this->createImage();
//第二步:设置干扰元素
$this->setDisturbColor();
//第三步:向图像中随机画出文本
$this->outputText($fontFace);
//第四步:输出图像
$this->outputImage();
}

//通过调用该方法获取随机创建的验证码字符串
function getCheckCode(){
return $this->checkCode;
}

private function createImage(){
//创建图像资源
$this->image=imagecreatetruecolor($this->width, $this->height);
//随机背景色
$backColor=imagecolorallocate($this->image, rand(225, 255), rand(225,255), rand(225, 255));
//为背景添充颜色
imagefill($this->image, 0, 0, $backColor);
//设置边框颜色
$border=imagecolorallocate($this->image, 0, 0, 0);
//画出矩形边框
imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $border);
}

private function setDisturbColor(){
for($i=0; $idisturbColorNum; $i++){
$color=imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));
imagesetpixel($this->image, rand(1, $this->width-2), rand(1, $this->height-2), $color);
}

for($i=0; $i $color=imagecolorallocate($this->image, rand(200, 255), rand(200, 255), rand(200, 255));
imagearc($this->image, rand(-10, $this->width), rand(-10, $this->height), rand(30, 300), rand(20, 200), 55, 44, $color);
}
}

private function createCheckCode(){
$code="23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";
$string='';
for($i=0; $i codeNum; $i++){
$char=$code{rand(0, strlen($code)-1)};
$string.=$char;
}

return $string;
}

private function outputText($fontFace=""){
for($i=0; $icodeNum; $i++){
$fontcolor=imagecolorallocate($this->image, rand(0, 128), rand(0, 128), rand(0, 128));
if($fontFace==""){
$fontsize=rand(3, 5);
$x=floor($this->width/$this->codeNum)*$i+3;
$y=rand(0, $this->height-15);
imagechar($this->image,$fontsize, $x, $y, $this->checkCode{$i},$fontcolor);
}else{
$fontsize=rand(12, 16);
$x=floor(($this->width-8)/$this->codeNum)*$i+8;
$y=rand($fontSize+5, $this->height);
imagettftext($this->image,$fontsize,rand(-30, 30),$x,$y ,$fontcolor, $fontFace, $this->checkCode{$i});
}
}
}

private function outputImage() {
if(imagetypes() & IMG_GIF){
header("Content-Type:image/gif");
imagepng($this->image);
}else if(imagetypes() & IMG_JPG){
header("Content-Type:image/jpeg");
imagepng($this->image);
}else if(imagetypes() & IMG_PNG){
header("Content-Type:image/png");
imagepng($this->image);
}else if(imagetypes() & IMG_WBMP){
header("Content-Type:image/vnd.wap.wbmp");
imagepng($this->image);
}else{
die("PHP不支持图像创建");
}
}

function __destruct(){
imagedestroy($this->image);
}
}code.php

session_start();
include "validationcode.class.php";

$code=new ValidationCode(80, 20, 4);

$code->showImage(); //输出到页面* 注册或登录使用

$_SESSION["code"]=$code->getCheckCode(); //将验证码保存到服务器中demo.php

session_start();
echo $_POST["code"]."
";
echo $_SESSION["code"]."
";

if(strtoupper($_POST["code"])==strtoupper($_SESSION["code"])){
echo "ok";
}else{
echo "error";
}
?>



user:

pass:

code: php图像处理(缩放、剪裁、缩放、翻转、旋转、透明、锐化)





1、画图

验证码,统计图

安装GD库(图片处理库)

■创建一个画布—-创建资源类型——–高度、宽度
■绘制图像
1、制定各种颜色
2、矩形、园、点、线段、扇形、画字(字符、字符串、freetype字体),每一个图像对应一个函数

■输出图像/保存处理好的图像
1、输出各种类型(gif、png、jpeg)

imagegif();
imagepng();
imagegpeg();

■释放资源
//step 1创建图片资源
$img=imagecreatetruecolor(200,200);
$red=imagecolorallocate($img,255,0,0);
$yellow=imagecolorallocate($img,255,255,0);
$green=imagecolorallocate($img,0,255,0);
$blue=imagecolorallocate($img,0,0,255);
imagefill($img,0,0,$yellow);//颜色填充
//step2画各种图形
imagefilledrectangle($img,10,10,80,80,$red);//画矩形并填充
imagerectangle($img,10,10,80,80,$red));//画矩形不填充,颜色填充

//线段
imageline($img,0, 0, 200, 200 ,$blue);
imageline($img,200, 0, 0, 200, $blue);

//点
imagesetpixel($img,50, 50 ,$red);
imagesetpixel($img,55, 50 ,$red);
imagesetpixel($img,59, 50 ,$red);
imagesetpixel($img,64, 50 ,$red);
imagesetpixel($img,72, 50 ,$red);

//圆
imageellipse($img, 100, 100, 100, 100,$green);
//圆
imagefilledellipse($img, 100, 100, 10, 10,$blue);
边框
//输出图像或保存图像
header("Content-Type:img/gif");
imagegif($img);
//释放资源
imagedestory($img);

画饼状图

//step 1创建图片资源
$img=imagecreatetruecolor(200, 200);

// $img=imagecreate(200, 200);

$white=imagecolorallocate($img, 255, 255, 255);
$gray=imagecolorallocate($img, 0xC0, 0xC0, 0xC0);
$darkgray=imagecolorallocate($img, 0x90, 0x90, 0x90);
$navy=imagecolorallocate($img, 0, 0, 0x80);
$darknavy=imagecolorallocate($img, 0, 0, 0x50);
$red= imagecolorallocate($img, 0xFF, 0, 0);
$darkred=imagecolorallocate($img, 0x90, 0, 0);

imagefill($img, 0, 0, $white);

//3D效果
for($i=60; $i>50; $i--){
imagefilledarc($img, 50, $i,100, 50, -160, 40, $darkgray, IMG_ARC_PIE);
imagefilledarc($img, 50, $i,100, 50, 40, 75, $darknavy, IMG_ARC_PIE);
imagefilledarc($img, 50, $i,100, 50, 75, 200, $darkred, IMG_ARC_PIE);
}
imagefilledarc($img, 50, $i,100, 50, -160, 40, $gray, IMG_ARC_PIE);
imagefilledarc($img, 50, $i,100, 50, 40, 75, $navy, IMG_ARC_PIE);
imagefilledarc($img, 50, $i,100, 50, 75, 200, $red, IMG_ARC_PIE);

header("Content-Type:image/gif");
imagegif($img);

//释放资源
imagedestroy($img);画文字

//step 1创建图片资源
$img=imagecreatetruecolor(200, 200);

// $img=imagecreate(200, 200);

$white=imagecolorallocate($img, 255, 255, 255);
$gray=imagecolorallocate($img, 0xC0, 0xC0, 0xC0);
$darkgray=imagecolorallocate($img, 0x90, 0x90, 0x90);
$navy=imagecolorallocate($img, 0, 0, 0x80);
$darknavy=imagecolorallocate($img, 0, 0, 0x50);
$red= imagecolorallocate($img, 0xFF, 0, 0);
$darkred=imagecolorallocate($img, 0x90, 0, 0);

imagefill($img, 0, 0, $gray);

imagechar($img, 5, 100, 100, "A", $red);
imagechar($img, 5, 120, 120, "B", $red);
imagecharup($img, 5, 60, 60, "C", $red);
imagecharup($img, 5, 80, 80, "D", $red);

imagestring($img, 3, 10, 10, "Hello", $navy);
imagestringup($img, 3, 10, 80, "Hello", $navy);

imagettftext($img, 25, 60, 150, 150, $red, "simkai.ttf", "##");
imagettftext($img, 12, -60, 50, 150, $red, "simli.ttf", "##");

header("Content-Type:image/gif");
imagegif($img);

//释放资源
imagedestroy($img);2、处理原有的图像