PHP100 2019-03-27
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, 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
代码如下:
$filename="./images/hee.jpg"; $per=0.3; list($width, $height)=getimagesize($filename); $n_w=$width*$per; $n_h=$width*$per; <p> $new=imagecreatetruecolor($n_w, $n_h);</p> <p> $img=imagecreatefromjpeg($filename); //拷贝部分图像并调整</p> <p> imagecopyresized($new, $img,0, 0,0, 0,$n_w, $n_h, $width, $height); //图像输出新图片、另存为</p> <p> imagejpeg($new, "./images/hee2.jpg");</p> <p> imagedestroy($new); imagedestroy($img); </p>
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
<p> if ($width && ($s_w < $s_h)) {
$width = ($height / $s_h) * $s_w;
} else {
$height = ($width / $s_w) * $s_h;
}</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);
imagedestroy($img);
}</p>
<p>thumn("images/hee.jpg", 200, 200, "./images/hee3.jpg");
</p>代码如下:
function thumn($background, $width, $height, $newfile) {
list($s_w, $s_h)=getimagesize($background);
<p> if ($width && ($s_w < $s_h)) {
$width = ($height / $s_h) * $s_w;
} else {
$height = ($width / $s_w) * $s_h;
}</p>
<p> $new=imagecreatetruecolor($width, $height);</p>
<p> $img=imagecreatefromgif($background);</p>
<p> $otsc=imagecolortransparent($img);
if($otsc >=0 && $otst < imagecolorstotal($img)){//判断索引色
$tran=imagecolorsforindex($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, $newt);
}</p>
<p> imagecopyresized($new, $img, 0, 0, 0, 0, $width, $height, $s_w, $s_h);</p>
<p> imagegif($new, $newfile);</p>
<p> imagedestroy($new);
imagedestroy($img);
}</p>
<p>thumn("images/map.gif", 200, 200, "./images/map3.gif");
</p>代码如下:
function cut($background, $cut_x, $cut_y, $cut_width, $cut_height, $location){
<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);
imagedestroy($back);
}</p>
<p>cut("./images/hee.jpg", 440, 140, 117, 112, "./images/hee5.jpg");
</p>文字水印
代码如下:
function mark_text($background, $text, $x, $y){
$back=imagecreatefromjpeg($background);
<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($back);
}</p>
<p> mark_text("./images/hee.jpg", "细说PHP", 150, 250);</p>
<p>//图片水印
function mark_pic($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);
</p>图片旋转
代码如下:
$back=imagecreatefromjpeg("./images/hee.jpg");
$new=imagerotate($back, 45, 0);
imagejpeg($new, "./images/hee9.jpg");代码如下:
function turn_y($background, $newfile){
$back=imagecreatefromjpeg($background);
<p> $width=imagesx($back);
$height=imagesy($back);</p>
<p> $new=imagecreatetruecolor($width, $height);</p>
<p> for($x=0; $x < $width; $x++){
imagecopy($new, $back, $width-$x-1, 0, $x, 0, 1, $height);
}</p>
<p> imagejpeg($new, $newfile);</p>
<p> imagedestroy($back);
imagedestroy($new);
}</p>
<p> function turn_x($background, $newfile){
$back=imagecreatefromjpeg($background);</p>
<p> $width=imagesx($back);
$height=imagesy($back);</p>
<p> $new=imagecreatetruecolor($width, $height);</p>
<p> for($y=0; $y < $height; $y++){
imagecopy($new, $back,0, $height-$y-1, 0, $y, $width, 1);
}</p>
<p> imagejpeg($new, $newfile);</p>
<p> imagedestroy($back);
imagedestroy($new);
}</p>
<p> turn_y("./images/hee.jpg", "./images/hee11.jpg");
turn_x("./images/hee.jpg", "./images/hee12.jpg");
</p>代码如下:
function sharp($background, $degree, $save){
$back=imagecreatefromjpeg($background);
<p> $b_x=imagesx($back);
$b_y=imagesy($back);</p>
<p> $dst=imagecreatefromjpeg($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, 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
$g=intval($b_clr2["green"]+$degree*($b_clr2["green"]-$b_clr1["green"]));
$b=intval($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
$g=min(255, max($g, 0));
$b=min(255, max($b, 0));</p>
<p> if(($d_clr=imagecolorexact($dst, $r, $g, $b))==-1){//等于1不在颜色范围内
$d_clr=Imagecolorallocate($dst, $r, $g, $b);//创建一个颜色
}</p>
<p> imagesetpixel($dst, $i, $j, $d_clr);
}</p>
<p> }
imagejpeg($dst, $save);
imagedestroy($back);
imagedestroy($dst);
}</p>
<p>sharp("./images/hee.jpg", 20, "./images/hee13.jpg");
</p>