欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  后端开发

php图像处理(缩放、剪裁、缩放、翻转、旋转、透明、锐化)_PHP教程

程序员文章站 2024-02-13 21:29:22
...
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)_PHP教程





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

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/632953.htmlTechArticle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...