我使用GD库成功调整了图像大小。我将任何图像的大小调整为350 x 250,问题是当它们调整大小时,某些图片看起来不太好(拉伸),因为我将它们调整为固定大小。我有一个350 x 250的空间,其中调整大小的图片需要适合,我不介意如果图片尺寸小于350 x 250,只要它不伸展。我该如何解决这个问题?
$save = "$directory/" . $file_name; //This is the new file you saving
$file = "$directory/" . $file_name; //This is the original file
list($width, $height) = getimagesize($file) ;
$modwidth = 350;
if ($width > $height) {
$y = 0;
$x = ($width - $height) / 2;
$smallestSide = $height;
} else {
$x = 0;
$y = ($height - $width) / 2;
$smallestSide = $width;
}
$diff = $width / $modwidth;
$modheight = 250;
$tn = imagecreatetruecolor($modwidth, $modheight) ;
$image = imagecreatefromjpeg($file) ;
imagecopyresampled($tn, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height);
imagejpeg($tn, $save, 100) ;
答案 0 :(得分:2)
尝试使用我之前写的这个函数:
public function resize($img, $width, $height, $stretch = false)
{
$temp = imagecreatetruecolor($width, $height);
imagealphablending($temp, true);
imagesavealpha($temp, true);
$bg = imagecolorallocatealpha($temp, 0, 0, 0, 127); // Background color
imagefill($temp, 0, 0, $bg);
if ($stretch)
{
imagecopyresampled($temp, img, 0, 0, 0, 0, $width, $height, imagesx($img), imagesy($img));
}
else
{
if (imagesx($img) <= $width && imagesy($img) <= $height)
{
$fwidth = imagesx($img);
$fheight = imagesy($img);
}
else
{
$wscale = $width / imagesx($img);
$hscale = $height / imagesy($img);
$scale = min($wscale, $hscale);
$fwidth = $scale * imagesx($img);
$fheight = $scale * imagesy($img);
}
imagecopyresampled($temp,
$img,
($width - $fwidth) / 2, ($height - $fheight) / 2,
0, 0,
$fwidth, $fheight,
imagesx($img), imagesy($img)
);
}
return $temp;
}
如果你说不拉伸图像,它会计算一个新尺寸,使其适合你的新尺寸。
将其用作:
...
$image = imagecreatefromjpeg($file);
$resized = resize($image, 350, 250, false); // false = don't stretch
imagejpeg($resized, $save, 100);
...
现在使用imagepng()将$调整大小存储在磁盘上。