>我正在尝试使用 php 创建和保存上传图像文件的平方版本(拇指)。我当前的脚本按原样裁剪它,但图像完全是黑色的。这是我的代码:
if ($_FILES['profile_pic']['type'] == "image/png") {
$is_image = true;
$newImage = imagecreatefrompng($img);
} else if ($_FILES['profile_pic']['type'] == "image/jpeg") {
$is_image = true;
$newImage = imagecreatefromjpeg($img);
} else if ($_FILES['profile_pic']['type'] == "image/gif") {
$is_image = true;
$newImage = imagecreatefromgif($img);
} else {
$is_image = false;
}
$img = $_FILES["profile_pic"]['tmp_name'];
$min_width = 100;
$min_height = 100;
$width = 0;
$height = 0;
if ($is_image) {
list($width, $height) = getimagesize($img);
}
if ($is_image && $height >= $min_height && $width >= $min_width) {
$img = $_FILES["profile_pic"]['tmp_name'];
$imgPath = "../img/profile_pics/{$member_id}.png";
// Resize
$aspect_ratio = $width / $min_width;
$new_height = $height * $aspect_ratio;
$canvas1 = imagecreatetruecolor($min_width, $new_height);
imagecopyresampled($canvas1, $newImage, 0, 0, 0, 0, $min_width, $new_height, $width, $new_height);
// Crop
$canvas2 = imagecreatetruecolor($min_width, $min_height);
imagecopyresampled($canvas2, $newImage, 0, 0, 0, 0, $min_width, $min_height, $min_width, $min_height);
imagejpeg($canvas2, $imgPath, 80);
imagedestroy($canvas1);
}
我意识到以前有人问过这个问题,但由于某种原因,我似乎无法使自己的脚本工作。
在尝试通过imagecreatefrompng($img)
或类似方式创建$img
后,您正在初始化它。可能是它失败的原因。
我也不确定您是否要将所有图像保存到 *.png 文件中,无论它们的源类型如何:您可能希望实现更灵活的内容。