题
我使用PHP生成缩略图。的问题是,我有一组宽度和高度缩略图需要是经常和时间的图像被拉长。
我想是图像保持在相同的比例,只是有黑色填料(或任何颜色)无论是在左,右为高图像或顶部和底部宽的图像。
下面是我目前使用的代码:(简单化位为可读性)
$temp_image_file = imagecreatefromjpeg("http://www.example.com/image.jpg");
list($width,$height) = getimagesize("http://www.example.com/image.jpg");
$image_file = imagecreatetruecolor(166,103);
imagecopyresampled($image_file,$temp_image_file,0,0,0,0,166,103,$width,$height);
imagejpeg($image_file,"thumbnails/thumbnail.jpg",50);
imagedestroy($temp_image_file);
imagedestroy($image_file);
解决方案
您将需要计算新的宽度和高度,以保持图像proportionat。检查出实施例2此页面上:
其他提示
好了它的工作,这是我落得这样做:
$filename = "http://www.example.com/image.jpg";
list($width,$height) = getimagesize($filename);
$width_ratio = 166 / $width;
if ($height * $width_ratio <= 103)
{
$adjusted_width = 166;
$adjusted_height = $height * $width_ratio;
}
else
{
$height_ratio = 103 / $height;
$adjusted_width = $width * $height_ratio;
$adjusted_height = 103;
}
$image_p = imagecreatetruecolor(166,103);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p,$image,ceil((166 - $adjusted_width) / 2),ceil((103 - $adjusted_height) / 2),0,0,ceil($adjusted_width),ceil($adjusted_height),$width,$height);
imagejpeg($image_p,"thumbnails/thumbnail.jpg",50);
下面是我写,需要一个GD的图像对象,最大宽度,最大高度,并且这些参数范围内再缩放的函数:
function resized($im, $mx, $my) {
$x = $nx = imagesx($im);
$y = $ny = imagesy($im);
$ar = $x / $y;
while ($nx > $mx || $ny > $my) {
if ($nx > $mx) {
$nx = $mx;
$ny = $nx / $ar;
}
if ($ny > $my) {
$ny = $my;
$nx = $ny * $ar;
}
}
if ($nx != $x) {
$im2 = imagecreatetruecolor($nx, $ny);
imagecopyresampled($im2, $im, 0, 0, 0, 0, $nx, $ny, $x, $y);
return $im2;
} else {
return $im;
}
}
如果所得到的图像不需要重新缩放然后它只是返回原始图像。
看一看这个上传类。它做你想要的东西,还可以做到更多。
此重新缩放图像的宽度和高度的较大尺寸,然后将它作物正确的尺寸。
// Crete an image forced to width and height
function createFixedImage($img, $id=0, $preFix=false, $mw='100', $mh='100', $quality=90){
// Fix path
$filename = '../'.$img;
// Check for file
if(file_exists($filename))
{
// Set a maximum height and width
$width = $mw;
$height = $mh;
// Get new dimensions
list($width_orig, $height_orig) = getimagesize($filename);
$ratio_orig = $width_orig/$height_orig;
if ($width/$height < $ratio_orig) {
$width = $height*$ratio_orig;
}else{
$height = $width/$ratio_orig;
}
// Resample
$image_p = imagecreatetruecolor($mw, $mh);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
// Output
imagejpeg($image_p, "../images/stories/catalog/{$preFix}{$id}.jpg", $quality);
}
}
不隶属于 StackOverflow