BLOB - PHP 调整图像大小

发布于 2024-11-09 03:58:56 字数 777 浏览 0 评论 0原文

我在调整 blob 图像大小时遇到一个小问题。我发现我必须调整 BLOB 的高度和宽度，但是因为人们上传的图像不是方形的，我如何正确地重新调整它们的大小？

基本上我想要的最大宽度为 300px；

我当前的代码是

 $desired_width = 300;
 $desired_height = 300;

 $sth = mysql_query("SELECT photobase FROM userpictures WHERE id = '".$array[0]."'");

 while($r = mysql_fetch_assoc($sth)) {
      $blobcontents = $r["photobase"];

      $im = imagecreatefromstring($blobcontents);
      $new = imagecreatetruecolor($desired_width, $desired_height);

      $x = imagesx($im);
      $y = imagesy($im);

      imagecopyresampled($new, $im, 0, 0, 0, 0, $desired_width, $desired_height, $x, $y);

      imagedestroy($im);

      header('Content-type: <span class="posthilit">image</span>/jpeg');

      imagejpeg($new, null, 85);

原文

I am having a small issue re-sizing blob images.
What I have found is I have to do height and width of the BLOB but because people upload images that are not square, how do I re-size them correctly?

Basicly I want a max width of 300px;

my current code is

 $desired_width = 300;
 $desired_height = 300;

 $sth = mysql_query("SELECT photobase FROM userpictures WHERE id = '".$array[0]."'");

 while($r = mysql_fetch_assoc($sth)) {
      $blobcontents = $r["photobase"];

      $im = imagecreatefromstring($blobcontents);
      $new = imagecreatetruecolor($desired_width, $desired_height);

      $x = imagesx($im);
      $y = imagesy($im);

      imagecopyresampled($new, $im, 0, 0, 0, 0, $desired_width, $desired_height, $x, $y);

      imagedestroy($im);

      header('Content-type: <span class="posthilit">image</span>/jpeg');

      imagejpeg($new, null, 85);

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陪你搞怪i 2024-11-16 03:58:56

调整图像大小并保持约束比例的简单方法：

<?php
// Constraints
$max_width = 100;
$max_height = 100;
list($width, $height) = getimagesize($img_path);
$ratioh = $max_height/$height;
$ratiow = $max_width/$width;
$ratio = min($ratioh, $ratiow);
// New dimensions
$width = intval($ratio*$width);
$height = intval($ratio*$height);
?>

A simple method to resize a image keeping the constraint proportions:

<?php
// Constraints
$max_width = 100;
$max_height = 100;
list($width, $height) = getimagesize($img_path);
$ratioh = $max_height/$height;
$ratiow = $max_width/$width;
$ratio = min($ratioh, $ratiow);
// New dimensions
$width = intval($ratio*$width);
$height = intval($ratio*$height);
?>

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