Question

如何拍摄已上传到服务器的500x500（或任何尺寸）图像，并根据定义的特定x，y坐标生成新图像？例如（0,0）到（50,0）; （0,50）至（50,50）。我想抓住图像的左上角，而不是将图像尺寸调整到50x50px，并且在某种意义上“裁剪”它以用作缩略图。

如何在PHP中执行此操作？

Answer 1

您想使用imagecopy。首先使用您想要的尺寸创建图像，然后使用imagecopy将源图像的一部分放入新图像中：

// use whatever mechanism you prefer to load your source image into $image
$width = 50;
$height = 50;
// Define your starting coordinates in the source image.
$source_x = 20;
$source_y = 100;
$new_image = imagecreatetruecolor($width, $height);
imagecopy($new_image, $image, 0, 0, $source_x, $source_y, $width, $height);
// Now $new_image has the portion cropped from the source and you can output or save it.
imagejpeg($new_image);

Answer 2

http://www.php.net/manual/en/function.imagick-cropthumbnailimage.php#81547

$image = new Imagick($path."test1.jpg");

$image->cropThumbnailImage(160,120); // Crop image and thumb

$image->writeImage($path."test1.jpg");

Answer 3

我已经看到了一些方法来做到这一点。如果您想动态生成拇指，可以使用：

function make_thumb($src,$dest,$desired_width)
{

  /* read the source image */
  $source_image = imagecreatefromjpeg($src);
  $width = imagesx($source_image);
  $height = imagesy($source_image);

  /* find the "desired height" of this thumbnail, relative to the desired width  */
  $desired_height = floor($height*($desired_width/$width));

  /* create a new, "virtual" image */
  $virtual_image = imagecreatetruecolor($desired_width,$desired_height);

  /* copy source image at a resized size */
  imagecopyresized($virtual_image,$source_image,0,0,0,0,$desired_width,$desired_height,$width,$height);

  /* create the physical thumbnail image to its destination */
  imagejpeg($virtual_image,$dest);
}

您还可以在imagejpeg函数中设置quality参数。

或者，如果您想将图像缩略图保存到我想看的目录：

http://bgallz.org/270/php-create-thumbnail-images/

或

http://www.imagemagick.org/script/index.php

PHP：使用X，Y坐标创建缩略图图像

3 个答案: