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按比例调整图像大小

发布于 2024-11-17 00:49:14 字数 64 浏览 0 评论 0原文

我想将上传的图像调整为宽度：180px，高度成比例。有没有任何课程可以做到这一点？

感谢您的帮助！

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决绝 2024-11-24 00:49:14

我认为这个问题可以用实际的代码示例来回答。下面的代码向您展示了如何调整 uploaded 目录中图像的大小，并将调整后的图像保存在 resized 文件夹中。

<?php
// the file
$filename = 'uploaded/my_image.jpg';

// the desired width of the image
$width = 180;

// content type
header('Content-Type: image/jpeg');

list($width_orig, $height_orig) = getimagesize($filename);

$ratio_orig = $width_orig/$height_orig;
$height = $width/$ratio_orig;

// resample
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

// output
imagejpeg($image_p, 'resized/my_image.jpg', 80);
?>

I think this question can use an answer with an actual code example. The code below shows you how you to resize an image inside a directory uploaded, and save the resized image in the folder resized.

<?php
// the file
$filename = 'uploaded/my_image.jpg';

// the desired width of the image
$width = 180;

// content type
header('Content-Type: image/jpeg');

list($width_orig, $height_orig) = getimagesize($filename);

$ratio_orig = $width_orig/$height_orig;
$height = $width/$ratio_orig;

// resample
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

// output
imagejpeg($image_p, 'resized/my_image.jpg', 80);
?>

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裸钻 2024-11-24 00:49:14

首先，您需要获取当前图像尺寸：

$width = imagesx($image);
$height = imagesy($image);

然后计算缩放因子：

$scalingFactor = $newImageWidth / $width;

当具有缩放因子时，只需计算图像的新高度：

$newImageHeight = $height * $scalingFactor;

然后创建新图像；

$newImage = imagecreatetruecolor($newImageWidth, $newImageHeight);
imagecopyresampled($newImage, $image, 0, 0, 0, 0, $newImageWidth, $newImageHeight, $width, $height);

也许这些片段会有所帮助：

http:// /www.codeslices.net/snippets/resize-scale-image-proportionally-to-given-width-in-php http://www.codeslices.net/snippets/resize-scale-image -proportionally-in-php

至少他们为我工作。

First you need to get the current image dimensions:

$width = imagesx($image);
$height = imagesy($image);

Then calculate the scaling factor:

$scalingFactor = $newImageWidth / $width;

When having the scaling factor just calculate the new height of the image:

$newImageHeight = $height * $scalingFactor;

Then just create the new image;

$newImage = imagecreatetruecolor($newImageWidth, $newImageHeight);
imagecopyresampled($newImage, $image, 0, 0, 0, 0, $newImageWidth, $newImageHeight, $width, $height);

Probably these snippets will help:

http://www.codeslices.net/snippets/resize-scale-image-proportionally-to-given-width-in-php http://www.codeslices.net/snippets/resize-scale-image-proportionally-in-php

at least they worked for me.

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