PHP GD功能无法正常工作

时间:2016-10-24 09:39:00

标签: php image-processing gd php-gd

我通过2个函数传递图像:a(),图像缩放功能& b(),图像颜色位功能。在b()完成之后我将它传回一个(),但是在b()处理完图像之后,我不再从a()获得任何返回值,假设b()函数是罪魁祸首在这里,我试图看看我在哪里出错了。

功能a();

function image_resize($src, $dst, $width, $height, $crop=0){

    if(!list($w, $h) = getimagesize($src)) return "Unsupported picture type!";

    $type = strtolower(substr(strrchr($src,"."),1));
    if($type == 'jpeg') $type = 'jpg';
    switch($type){
        case 'bmp': $img = imagecreatefromwbmp($src); break;
        case 'gif': $img = imagecreatefromgif($src); break;
        case 'jpg': $img = imagecreatefromjpeg($src); break;
        case 'png': $img = imagecreatefrompng($src); break;
        default : return "Unsupported picture type!";
    }

    // resize
    if($crop){
        if($w < $width or $h < $height) return "Picture is too small!";
        $ratio = max($width/$w, $height/$h);
        $h = $height / $ratio;
        $x = ($w - $width / $ratio) / 2;
        $w = $width / $ratio;
    }
    else{
        if($w < $width and $h < $height) return "Picture is too small!";
        $ratio = min($width/$w, $height/$h);
        $width = $w * $ratio;
        $height = $h * $ratio;
        $x = 0;
    }

    $new = imagecreatetruecolor($width, $height);

    // preserve transparency
    if($type == "gif" or $type == "png"){
        imagecolortransparent($new, imagecolorallocatealpha($new, 0, 0, 0, 127));
        imagealphablending($new, false);
        imagesavealpha($new, true);
    }

    imagecopyresampled($new, $img, 0, 0, $x, 0, $width, $height, $w, $h);
    switch($type){
        case 'bmp': imagewbmp($new, $dst); break;
        case 'gif': imagegif($new, $dst); break;
        case 'jpg': imagejpeg($new, $dst); break;
        case 'png': imagepng($new, $dst); break;
    }
    return true;
}

功能b();

function convertJPGto8bitJPG($sourcePath, $destPath) {
    $srcimage = imagecreatefromjpeg ($sourcePath);
    list($width, $height) = getimagesize($sourcePath);
    $img = imagecreatetruecolor($width, $height);
    $bga = imagecolorallocatealpha($img, 0, 0, 0, 127);
    imagecolortransparent($img, $bga);
    imagefill($img, 0, 0, $bga);
    imagecopy($img, $srcimage, 0, 0, 0, 0, $width, $height);
    imagetruecolortopalette($img, false, 255);
    imagesavealpha($img, true);
    imagejpeg($img, $destPath);
    //imagedestroy($img);
    return $destPath;
}

请不要问“为什么不用imagemagick ..&#39;”,对于xampp而言,压倒性且难以接受的过多差异版本我只是放弃了imagemagick而且GD很好,如果你有关于GD的图书馆的任何建议以及对这个混乱的快速解决方案,这将是最感激的。

0 个答案:

没有答案