php imagecopyresampled问题

我对imagecopyresampled有一些问题，主要是图像缩放不正确，图像位置错误，边缘周围有黑色边框

我设置了以下VAR

    $tW = $width; // Original width of image
    $tH = $height; // Orignal height of image

    $w = postvar; // New width
    $h = postvar; // New height
    $x = postvar; // New X pos
    $y = postvar; // New Y pos

然后运行以下命令

    $tn = imagecreatetruecolor($w, $h);
    $image = imagecreatefromjpeg('filepathhere.jpeg');
    imagecopyresampled($tn, $image, 0, 0, $x, $y, $w, $h, $tW, $tH);

---

如果有人有任何线索，那将是巨大的帮助！谢谢这里有几个问题。首先，不应使用指定的新高度和宽度创建新图像，而应根据原始图像的比率计算新高度和宽度，否则缩放后的图像将失真。例如，下面的代码将创建一个大小正确的图像，该图像将适合给定的

$w x$h

矩形：

$tW = $width;    //original width
$tH = $height;   //original height

$w = postvar;
$h = postvar;

if($w == 0 || $h == 0) {
    //error...
    exit;
}

if($tW / $tH > $w / $h) {
    // specified height is too big for the specified width
    $h = $w * $tH / $tW;
}
elseif($tW / $tH < $w / $h) {
    // specified width is too big for the specified height
    $w = $h * $tW / $tH;
}

$tn = imagecreatetruecolor($w, $h);  //this will create it with black background
imagefill($tn, 0, 0, imagecolorallocate($tn, 255, 255, 255));    //fill it with white;

//now you can copy the original image:
$image = imagecreatefromjpeg('filepathhere.jpeg');
//next line will just create a scaled-down image
imagecopyresampled($tn, $image, 0, 0, 0, 0, $w, $h, $tW, $tH);

---

如果您提供更多关于您试图实现的目标的详细信息，我可能会进一步提供帮助。

您到底想做什么，预期的结果是什么？抱歉，根据提供的信息无法判断。原始尺寸是多少？$tW和$tH的值是多少？您是否可能对原始图像之外的区域重新采样？值随“裁剪”工具提交的内容而变化。因此，每次有人运行该工具时，它们都会有所不同。$width和$height值来自一个列表（$width，$height）=getimagesize（'filepath.jpg'）；

$tW = $width - $x;    //original width
$tH = $height - $y;   //original height

$w = postvar;
$h = postvar;

if($w == 0 || $h == 0) {
    //error...
    exit;
}

if($tW / $tH > $w / $h) {
    // specified height is too big for the specified width
    $h = $w * $tH / $tW;
}
elseif($tW / $tH < $w / h) {
    // specified width is too big for the specified height
    $w = $h * $tW / $tH;
}

$tn = imagecreatetruecolor($w, $h);  //this will create it with black background
imagefill($tn, 0, 0, imagecolorallocate($tn, 255, 255, 255));    //fill it with white;

//now you can copy the original image:
$image = imagecreatefromjpeg('filepathhere.jpeg');
//next line will create a scaled-down portion of the original image from coordinates ($x, $y) to the lower-right corner
imagecopyresampled($tn, $image, 0, 0, $x, $y, $w, $h, $tW, $tH);