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 $img=imagecreatefromgif("./images/map.gif"); 代码如下:$red= imagecolorallocate($img,255,0); imageline($img,100,$red); imageellipse($img,200,$red); imagegif($img,"./images/map2.gif"); imagedestroy($img);
图片普通缩放 代码如下:$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,$n_w,$n_h,$width,$height); //图像输出新图片、另存为
imagejpeg($new,"./images/hee2.jpg");
imagedestroy($new); imagedestroy($img);
图片等比例缩放、没处理透明色 代码如下:function thumn($background,$height,$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($new,$s_w,$s_h);
imagejpeg($new,$newfile);
imagedestroy($new); imagedestroy($img); }
thumn("images/hee.jpg","./images/hee3.jpg");
gif透明色处理 代码如下:function thumn($background,$s_h)=getimagesize($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,$newt);
imagecolortransparent($new,$newt); }
imagecopyresized($new,$s_h);
imagegif($new,$newfile);
imagedestroy($new); imagedestroy($img); }
thumn("images/map.gif","./images/map3.gif");
图片裁剪 代码如下:function cut($background,$cut_x,$cut_y,$cut_width,$cut_height,$location){
$back=imagecreatefromjpeg($background);
$new=imagecreatetruecolor($cut_width,$cut_height);
imagecopyresampled($new,$back,$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
代码如下:function mark_text($background,$text,$x,$y){ $back=imagecreatefromjpeg($background);
$color=imagecolorallocate($back,0);
imagettftext($back,20,$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,$y){ $back=imagecreatefromjpeg($background); $water=imagecreatefromgif($waterpic); $w_w=imagesx($water); $w_h=imagesy($water); imagecopy($back,$water,$w_w,$w_h); imagejpeg($back,"./images/hee8.jpg"); imagedestroy($back); imagedestroy($water); } mark_pic("./images/hee.jpg","./images/gaolf.gif",50,200);
图片旋转
代码如下:$back=imagecreatefromjpeg("./images/hee.jpg"); $new=imagerotate($back,45,0); imagejpeg($new,"./images/hee9.jpg");
图片水平翻转垂直翻转 代码如下:function turn_y($background,$newfile){ $back=imagecreatefromjpeg($background);
$width=imagesx($back); $height=imagesy($back);
$new=imagecreatetruecolor($width,$height);
for($x=0; $x < $width; $x++){ imagecopy($new,$width-$x-1,1,$height); }
imagejpeg($new,$newfile);
imagedestroy($back); imagedestroy($new); }
function turn_x($background,$height);
for($y=0; $y < $height; $y++){ imagecopy($new,$height-$y-1,1); }
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
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,$i,$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,$b);//创建一个颜色 }
imagesetpixel($dst,$j,$d_clr); }
} imagejpeg($dst,$save); imagedestroy($back); imagedestroy($dst); }
sharp("./images/hee.jpg","./images/hee13.jpg");
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