php对图像的各种处理函数代码小结_php技巧

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);<BR> imageline($img, 0, 0, 100, 100, $red);<BR> imageellipse($img, 200, 100, 100, 100, $red);<BR> imagegif($img, "./images/map2.gif");<BR> imagedestroy($img);<BR>

图片普通缩放

$filename="./images/hee.jpg";<BR> $per=0.3;<BR> list($width, $height)=getimagesize($filename);<BR> $n_w=$width*$per;<BR> $n_h=$width*$per;</P><P> $new=imagecreatetruecolor($n_w, $n_h);</P><P> $img=imagecreatefromjpeg($filename);<BR>//拷贝部分图像并调整</P><P> imagecopyresized($new, $img,0, 0,0, 0,$n_w, $n_h, $width, $height);<BR>//图像输出新图片、另存为</P><P> imagejpeg($new, "./images/hee2.jpg");</P><P> imagedestroy($new);<BR> imagedestroy($img);<BR>

图片等比例缩放、没处理透明色

function thumn($background, $width, $height, $newfile) {<BR> list($s_w, $s_h)=getimagesize($background);//获取原图片高度、宽度</P><P> if ($width && ($s_w < $s_h)) {<BR>     $width = ($height / $s_h) * $s_w;<BR> } else {<BR>     $height = ($width / $s_w) * $s_h;<BR> }</P><P> $new=imagecreatetruecolor($width, $height);</P><P> $img=imagecreatefromjpeg($background);</P><P> imagecopyresampled($new, $img, 0, 0, 0, 0, $width, $height, $s_w, $s_h);</P><P> imagejpeg($new, $newfile);</P><P> imagedestroy($new);<BR> imagedestroy($img);<BR>}</P><P>thumn("images/hee.jpg", 200, 200, "./images/hee3.jpg");<BR>

gif透明色处理

function thumn($background, $width, $height, $newfile) {<BR> list($s_w, $s_h)=getimagesize($background);</P><P> if ($width && ($s_w < $s_h)) {<BR>     $width = ($height / $s_h) * $s_w;<BR> } else {<BR>     $height = ($width / $s_w) * $s_h;<BR> }</P><P> $new=imagecreatetruecolor($width, $height);</P><P> $img=imagecreatefromgif($background);</P><P> $otsc=imagecolortransparent($img);<BR> if($otsc >=0 && $otst < imagecolorstotal($img)){//判断索引色<BR>  $tran=imagecolorsforindex($img, $otsc);//索引颜色值</P><P>  $newt=imagecolorallocate($new, $tran["red"], $tran["green"], $tran["blue"]);</P><P>  imagefill($new, 0, 0, $newt);</P><P>  imagecolortransparent($new, $newt);<BR> }</P><P> imagecopyresized($new, $img, 0, 0, 0, 0, $width, $height, $s_w, $s_h);</P><P> imagegif($new, $newfile);</P><P> imagedestroy($new);<BR> imagedestroy($img);<BR>}</P><P>thumn("images/map.gif", 200, 200, "./images/map3.gif");<BR>

图片裁剪

function cut($background, $cut_x, $cut_y, $cut_width, $cut_height, $location){</P><P> $back=imagecreatefromjpeg($background);</P><P> $new=imagecreatetruecolor($cut_width, $cut_height);</P><P> imagecopyresampled($new, $back, 0, 0, $cut_x, $cut_y, $cut_width, $cut_height,$cut_width,$cut_height);</P><P> imagejpeg($new, $location);</P><P> imagedestroy($new);<BR> imagedestroy($back);<BR>}</P><P>cut("./images/hee.jpg", 440, 140, 117, 112, "./images/hee5.jpg");<BR>

图片加水印

文字水印

function mark_text($background, $text, $x, $y){<BR>  $back=imagecreatefromjpeg($background);</P><P>  $color=imagecolorallocate($back, 0, 255, 0);</P><P>  imagettftext($back, 20, 0, $x, $y, $color, "simkai.ttf", $text);</P><P>  imagejpeg($back, "./images/hee7.jpg");</P><P>  imagedestroy($back);<BR> }</P><P> mark_text("./images/hee.jpg", "细说PHP", 150, 250);</P><P>//图片水印<BR>function mark_pic($background, $waterpic, $x, $y){<BR>$back=imagecreatefromjpeg($background);<BR>$water=imagecreatefromgif($waterpic);<BR>$w_w=imagesx($water);<BR>$w_h=imagesy($water);<BR>imagecopy($back, $water, $x, $y, 0, 0, $w_w, $w_h);<BR>imagejpeg($back,"./images/hee8.jpg");<BR>imagedestroy($back);<BR>imagedestroy($water);<BR>}<BR>mark_pic("./images/hee.jpg", "./images/gaolf.gif", 50, 200);<BR>

图片旋转

$back=imagecreatefromjpeg("./images/hee.jpg");<BR> $new=imagerotate($back, 45, 0);<BR> imagejpeg($new, "./images/hee9.jpg");<BR>

图片水平翻转垂直翻转

function turn<strong style="color:transparent">本文来源gao@daima#com搞(%代@#码@网&</strong><strong>搞gaodaima代码</strong>_y($background, $newfile){<BR>  $back=imagecreatefromjpeg($background);</P><P>  $width=imagesx($back);<BR>  $height=imagesy($back);</P><P>  $new=imagecreatetruecolor($width, $height);</P><P>  for($x=0; $x < $width; $x++){<BR>   imagecopy($new, $back, $width-$x-1, 0, $x, 0, 1, $height);<BR>  }</P><P>  imagejpeg($new, $newfile);</P><P>  imagedestroy($back);<BR>  imagedestroy($new);<BR> }</P><P> function turn_x($background, $newfile){<BR>  $back=imagecreatefromjpeg($background);</P><P>  $width=imagesx($back);<BR>  $height=imagesy($back);</P><P>  $new=imagecreatetruecolor($width, $height);</P><P>  for($y=0; $y < $height; $y++){<BR>   imagecopy($new, $back,0, $height-$y-1, 0, $y, $width, 1);<BR>  }</P><P>  imagejpeg($new, $newfile);</P><P>  imagedestroy($back);<BR>  imagedestroy($new);<BR> }</P><P> turn_y("./images/hee.jpg", "./images/hee11.jpg");<BR> turn_x("./images/hee.jpg", "./images/hee12.jpg");<BR>

图片锐化

function sharp($background, $degree, $save){<BR> $back=imagecreatefromjpeg($background);</P><P> $b_x=imagesx($back);<BR> $b_y=imagesy($back);</P><P> $dst=imagecreatefromjpeg($background);<BR> for($i=0; $i<$b_x; $i++){<BR>  for($j=0; $j<$b_y; $j++){<BR>   $b_clr1=imagecolorsforindex($back, imagecolorat($back, $i-1, $j-1));\\前一个像素颜色数组<BR>   $b_clr2=imagecolorsforindex($back, imagecolorat($back, $i, $j));\\取出当前颜色数组</P><P>   $r=intval($b_clr2["red"]+$degree*($b_clr2["red"]-$b_clr1["red"]));\\加深<BR>   $g=intval($b_clr2["green"]+$degree*($b_clr2["green"]-$b_clr1["green"]));<BR>   $b=intval($b_clr2["blue"]+$degree*($b_clr2["blue"]-$b_clr1["blue"]));</P><P>   $r=min(255, max($r, 0));//限制r范围在0-255之间<BR>   $g=min(255, max($g, 0));<BR>   $b=min(255, max($b, 0));</P><P>   if(($d_clr=imagecolorexact($dst, $r, $g, $b))==-1){//等于1不在颜色范围内<BR>    $d_clr=Imagecolorallocate($dst, $r, $g, $b);//创建一个颜色<BR>   }</P><P>   imagesetpixel($dst, $i, $j, $d_clr);<BR>  }</P><P> }<BR> imagejpeg($dst, $save);<BR> imagedestroy($back);<BR> imagedestroy($dst);<BR>}</P><P>sharp("./images/hee.jpg", 20, "./images/hee13.jpg");<BR>

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