PHP图像处理之在原图像处理

<?php
//利用原有的图片创建图片资源
$img=imagecreatefromgif("./images/map.gif");
//设置颜色
$red=imagecolorallocate($img, 255, 0, 0);

//画线
imageline($img,0, 0, 100, 100, $red);

//画圆
imageellipse($img, 200, 100, 100, 100, $red);

//保存图片
imagegif($img,"./images/map2.gif");

//释放资源
imagedestroy($img);
?>

<?php
$img=imagecreatefromgif("./images/map.gif");
$red=imagecolorallocate($img, 255, 0, 0);

//输出图片的高度和宽度
echo ‘width:‘.imagesx($img)."<br>";
echo ‘height:‘.imagesy($img)."<br>";

echo ‘<pre>‘;
//取得图像大小
print_r(getimagesize("./images/map.gif"));
echo ‘</pre>‘;

imagedestroy($img);
?>

<?php
function thumn($background,$newWidth,$newHeight,$newFile){
    //取出图片的宽高
    list($width,$height)=getimagesize($background);
    //求的而缩放的宽高
    if ($newWidth && ($width < $height)){
        $newWidth=($newHeight/$height)*$width;
    } else {
           $newHeight=($newWidth/$width)*$height;
    }
    //创建缩放后图片的画布
    $new=imagecreatetruecolor($newWidth,$newHeight);
    $img=imagecreatefromgif($background);

    //imagecolortransparent();    将某个颜色定义为透明色
    $otsc=imagecolortransparent($img);
    //imagecolorstotal();   取得一幅图像的调色板中颜色的数目
    if($otsc>=0 && $otsc<imagecolorstotal($img)){
        //imagecolorsforindex();   取得某索引的颜色
        $tran=imagecolorsforindex($img, $otsc);
        //新的颜色
        $newt=imagecolorallocate($new, $tran["red"], $tran["green"], $tran["blue"]);
        //新的颜色设为缩放图片的颜色
        imagefill($new, 0, 0, $newt);
        //将缩放图片的颜色设为背景透明
        imagecolortransparent($new,newt);
    }
    //缩放原图片
    imagecopyresampled($new, $img,0,0,0,0, $newWidth, $newHeight, $width, $height);
    //保存缩放后的图片
    imagegif($new,$newFile);
    //释放资源
    imagedestroy($new);
    imagedestroy($img);
}


thumn("images/map.gif",200,200,"./images/map3.gif");
?>

<?php
function cut($background, $cut_x, $cut_y, $cut_width, $cut_height, $location){

    $back=imagecreatefromjpeg($background);

    $new=imagecreatetruecolor($cut_width, $cut_height);

    imagecopyresampled($new, $back, 0, 0, $cut_x, $cut_y, $cut_width, $cut_height,$cut_width,$cut_height);

    imagejpeg($new, $location);

    imagedestroy($new);
    imagedestroy($back);
}

cut("./images/hee.jpg", 440, 140, 117, 112, "./images/hee5.jpg");
?>

<?php
    function mark_text($background, $text, $x, $y){
        $back=imagecreatefromjpeg($background);

        $color=imagecolorallocate($back, 0, 255, 0);
    
        imagettftext($back, 20, 0, $x, $y, $color, "simkai.ttf", $text);

        imagejpeg($back, "./images/hee7.jpg");

        imagedestroy($back);
    }

    mark_text("./images/hee.jpg", "细说PHP", 150, 250);

    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)
?>

<?php
    $back=imagecreatefromjpeg("./images/hee.jpg");

    $new=imagerotate($back, 45, 0);

    imagejpeg($new, "./images/hee9.jpg");
?>

<?php
    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");
?>

<?php
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));    
            $b_clr2=imagecolorsforindex($back, imagecolorat($back, $i, $j));

            $r=intval($b_clr2["red"]+$degree*($b_clr2["red"]-$b_clr1["red"]));
            $g=intval($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));
            $g=min(255, max($g, 0));
            $b=min(255, max($b, 0));

            if(($d_clr=imagecolorexact($dst, $r, $g, $b))==-1){
                $d_clr=Imagecolorallocate($dst, $r, $g, $b);
            }

            imagesetpixel($dst, $i, $j, $d_clr);
        }
    
    }
    imagejpeg($dst, $save);
    imagedestroy($back);
    imagedestroy($dst);
}

sharp("./images/hee.jpg", 20, "./images/hee13.jpg");
?>