imagecopy重采样裁剪
如果我有一张 2048 x 2048 的图像，并且我想要一张 1488x1488 的图像，从顶部向下 450 像素，从左侧 280 像素，
则正确的代码 x.png 是 2048 x 2048 图片：
<?php
$imagesrc_location = 'x.png';
// Get new sizes
list($srcwidth, $srcheight) = getimagesize($imagesrc_location);
$imagedst = imagecreatetruecolor(1488, 1488);
$imagesrc = imagecreatefrompng($imagesrc_location);
if (imagecopyresampled($imagedst,$imagesrc,0,0,280,450,1488,1488,2048,2048)) {
// Output image
header('Content-type: image/png');
imagepng($imagedst);
} else {
echo "Could not resize file";
}
这是一张显示我想要的图片，灰色部分是裁剪后的图片。
If I have an image 2048 x 2048 and I would like an image 1488x1488 450 pixels down from top and 280 pixels from left
is this the right code x.png is the 2048 x 2048 picture:
<?php
$imagesrc_location = 'x.png';
// Get new sizes
list($srcwidth, $srcheight) = getimagesize($imagesrc_location);
$imagedst = imagecreatetruecolor(1488, 1488);
$imagesrc = imagecreatefrompng($imagesrc_location);
if (imagecopyresampled($imagedst,$imagesrc,0,0,280,450,1488,1488,2048,2048)) {
// Output image
header('Content-type: image/png');
imagepng($imagedst);
} else {
echo "Could not resize file";
}
Here is a picture showing what I want, the grey part is the cropped picture.
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评论（1）
编辑：我认为问题是，您的源大小将使
imagecopyresampled缩小。这可能适用于作物：但是请看这里： http://www.johnconde.net/blog/cropping-an-image-with-php-and-the-gd-library/
我认为你想要的是：
https://www.php.net/手册/en/function.imagecopy.php
https://www.php.net/manual/en/function.imagecopyresampled.php
EDIT: I think the problem is, your source size will make the
imagecopyresampledscale it down. This may work for a crop:But look here: http://www.johnconde.net/blog/cropping-an-image-with-php-and-the-gd-library/
I think that what you want is:
https://www.php.net/manual/en/function.imagecopy.php
https://www.php.net/manual/en/function.imagecopyresampled.php