php对图像的各种处理函数代码小结(2)

//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

复制代码 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

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=0; $x < $width; $x++){
   imagecopy($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 < $height; $y++){
   imagecopy($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

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=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

$r=intval($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");

您可能感兴趣的文章: