PHP中的裁剪图像
PHP中的裁剪图像
提问于 2009-12-07 01:39:59
下面的代码很好地裁剪图像，这是我想要的，但对于较大的图像，它也可以工作。有没有办法“缩小图像”？
理想情况下，我将能够让每个图像在裁剪之前大致相同的大小，以便我每次都能得到好的结果
代码是
<?php
$image = $_GET['src']; // the image to crop
$dest_image = 'images/cropped_whatever.jpg'; // make sure the directory is writeable
$img = imagecreatetruecolor('200','150');
$org_img = imagecreatefromjpeg($image);
$ims = getimagesize($image);
imagecopy($img,$org_img, 0, 0, 20, 20, 200, 150);
imagejpeg($img,$dest_image,90);
imagedestroy($img);
echo '<img src="'.$dest_image.'" ><p>';回答 6
Stack Overflow用户
发布于 2012-08-13 18:38:39
imagecopyresampled()将从位置为($src_x, $src_y)的宽度为$src_w和高度为$src_h的$src_image中获取一个矩形区域，并将其放置在位置为($dst_x, $dst_y)的宽度为$dst_w和高度为$dst_h的$dst_image中的矩形区域中。
如果源和目标坐标以及宽度和高度不同，将对图像片段执行适当的拉伸或收缩。坐标指的是左上角。
此函数可用于复制同一镜像中的区域。但如果区域重叠，结果将是不可预测的。
-编辑-
如果$src_w和$src_h分别小于$dst_w和$dst_h，则会放大拇指图像。否则，它将被缩小。
<?php
$dst_x = 0; // X-coordinate of destination point
$dst_y = 0; // Y-coordinate of destination point
$src_x = 100; // Crop Start X position in original image
$src_y = 100; // Crop Srart Y position in original image
$dst_w = 160; // Thumb width
$dst_h = 120; // Thumb height
$src_w = 260; // Crop end X position in original image
$src_h = 220; // Crop end Y position in original image
// Creating an image with true colors having thumb dimensions (to merge with the original image)
$dst_image = imagecreatetruecolor($dst_w, $dst_h);
// Get original image
$src_image = imagecreatefromjpeg('images/source.jpg');
// Cropping
imagecopyresampled($dst_image, $src_image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h);
// Saving
imagejpeg($dst_image, 'images/crop.jpg');
?>Stack Overflow用户
发布于 2016-03-26 22:22:47
PHP5.5有一个imagecrop函数http://php.net/manual/en/function.imagecrop.php
Stack Overflow用户
发布于 2016-12-22 00:13:06
HTML代码：-
enter code here
<!DOCTYPE html>
<html>
<body>
<form action="upload.php" method="post" enctype="multipart/form-data">
Select image to upload:
<input type="file" name="image" id="fileToUpload">
<input type="submit" value="Upload Image" name="submit">
</form>
</body>
</html>upload.php
enter code here
<?php
$image = $_FILES;
$NewImageName = rand(4,10000)."-". $image['image']['name'];
$destination = realpath('../images/testing').'/';
move_uploaded_file($image['image']['tmp_name'], $destination.$NewImageName);
$image = imagecreatefromjpeg($destination.$NewImageName);
$filename = $destination.$NewImageName;
$thumb_width = 200;
$thumb_height = 150;
$width = imagesx($image);
$height = imagesy($image);
$original_aspect = $width / $height;
$thumb_aspect = $thumb_width / $thumb_height;
if ( $original_aspect >= $thumb_aspect )
{
// If image is wider than thumbnail (in aspect ratio sense)
$new_height = $thumb_height;
$new_width = $width / ($height / $thumb_height);
}
else
{
// If the thumbnail is wider than the image
$new_width = $thumb_width;
$new_height = $height / ($width / $thumb_width);
}
$thumb = imagecreatetruecolor( $thumb_width, $thumb_height );
// Resize and crop
imagecopyresampled($thumb,
$image,
0 - ($new_width - $thumb_width) / 2, // Center the image horizontally
0 - ($new_height - $thumb_height) / 2, // Center the image vertically
0, 0,
$new_width, $new_height,
$width, $height);
imagejpeg($thumb, $filename, 80);
echo "cropped"; die;
?> 页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/1855996
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