一创建图片资源
imagecreatetruecolor(widthheight);
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 包含图像宽度的像素值索引 包含图像高度的像素值索引 是图像类型的标记 = GIF = JPG = PNG = SWF = PSD = BMP = TIFF(intel byte order) = TIFF(motorola byte order) = JPC = JP = JPX = JB = SWC = IFF = WBMP = XBM这些标记与 PHP 新加的 IMAGETYPE 常量对应索引 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
PNGjpeg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/mapgif");
复制代码 代码如下:
$red= imagecolorallocate($img
);
imageline($img
$red);
imageellipse($img
$red);
imagegif($img
"
/images/map
gif");
imagedestroy($img);
图片普通缩放
复制代码 代码如下:
$filename="
/images/hee
jpg";
$per=
;
list($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/heejpg");
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 $width $height $s_w $s_h);
imagejpeg($new $newfile);
imagedestroy($new);
imagedestroy($img);
}
thumn("images/heejpg" "/images/heejpg");
gif透明色处理
复制代码 代码如下:
function thumn($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 >= && $otst < imagecolorstotal($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 $img $width $height $s_w $s_h);
imagegif($new $newfile);
imagedestroy($new);
imagedestroy($img);
}
thumn("images/mapgif" "/images/mapgif");
图片裁剪
复制代码 代码如下:
function cut($background
$cut_x
$cut_y
$cut_width
$cut_height
$location){
$back=imagecreatefromjpeg($background);
$new=imagecreatetruecolor($cut_width $cut_height);
imagecopyresampled($new $back $cut_x $cut_y $cut_width $cut_height$cut_width$cut_height);
imagejpeg($new $location);
imagedestroy($new);
imagedestroy($back);
}
cut("/images/heejpg" "/images/heejpg");
图片加水印
文字水印
复制代码 代码如下:
function mark_text($background
$text
$x
$y){
$back=imagecreatefromjpeg($background);
$color=imagecolorallocate($back );
imagettftext($back $x $y $color "simkaittf" $text);
imagejpeg($back "/images/heejpg");
imagedestroy($back);
}
mark_text("/images/heejpg" "细说PHP" );
//图片水印
function mark_pic($background $waterpic $x $y){
$back=imagecreatefromjpeg($background);
$water=imagecreatefromgif($waterpic);
$w_w=imagesx($water);
$w_h=imagesy($water);
imagecopy($back $water $x $y $w_w $w_h);
imagejpeg($back"/images/heejpg");
imagedestroy($back);
imagedestroy($water);
}
mark_pic("/images/heejpg" "/images/gaolfgif" );
图片旋转
复制代码 代码如下:
$back=imagecreatefromjpeg("
/images/hee
jpg");
$new=imagerotate($back
);
imagejpeg($new
"
/images/hee
jpg");
图片水平翻转垂直翻转
复制代码 代码如下:
function turn_y($background
$newfile){
$back=imagecreatefromjpeg($background);
$width=imagesx($back);
$height=imagesy($back);
$new=imagecreatetruecolor($width $height);
for($x=; $x < $width; $x++){
imagecopy($new $back $width$x $x $height);
}
imagejpeg($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=; $y < $height; $y++){
imagecopy($new $back $height$y $y $width );
}
imagejpeg($new $newfile);
imagedestroy($back);
imagedestroy($new);
}
turn_y("/images/heejpg" "/images/heejpg");
turn_x("/images/heejpg" "/images/heejpg");
图片锐化
复制代码 代码如下:
function sharp($background $degree $save){
$back=imagecreatefromjpeg($background);
$b_x=imagesx($back);
$b_y=imagesy($back);
$dst=imagecreatefromjpeg($background);
for($i=; $i<$b_x; $i++){
for($j=; $j<$b_y; $j++){
$b_clr=imagecolorsforindex($back imagecolorat($back $i $j));前一个像素颜色数组
$b_clr=imagecolorsforindex($back imagecolorat($back $i $j));取出当前颜色数组
$r=intval($b_clr["red"]+$degree*($b_clr["red"]$b_clr["red"]));加深
$g=intval($b_clr["green"]+$degree*($b_clr["green"]$b_clr["green"]));
$b=intval($b_clr["blue"]+$degree*($b_clr["blue"]$b_clr["blue"]));
$r=min( max($r ));//限制r范围在之间
$g=min( max($g ));
$b=min( max($b ));
if(($d_clr=imagecolorexact($dst $r $g $b))==){//等于不在颜色范围内
$d_clr=Imagecolorallocate($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/heejpg" "/images/heejpg");
