PHP：使用X，Y坐标创建缩略图图像

Question

如何获取已上传到服务器的500x500（或任何大小）图像，并根据定义的特定x，y坐标生成新图像？例如（0,0）至（50,0）; （0,50）至（50,50）。我不想将图像大小调整为50x50像素，而是想抓取图像的左上角部分，并在某种意义上将其“裁剪”为缩略图。

我该如何去做这个在PHP中？

Answer 1

你想用imagecopy。首先创建一个你想要的尺寸的图像，然后使用imagecopy的源图像的一部分到新的形象：

// 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

我见过几个方法可以做到这一点。如果您想在飞行中生成拇指，您可以使用：

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); 
} 

您也可以在imagejpeg函数中设置质量参数。

或者，如果你想将图像拇指保存到一个目录我想看看：

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

或

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