創建完美的縮略圖

下面的代碼工作沒有任何錯誤，但我的問題是當我創建縮略圖有時縮略圖是不可理解的（一些條件如寬度比高度大）我也試過一個代碼計算高度自動。但它不會完美的作品。我想這將創建一個可以理解的縮略圖每次一碼（可生成裁剪縮略圖）創建完美的縮略圖

function make_thumb($src, $dest, $desired_width) 
{ 
    $source_image = imagecreatefromjpeg($src); 
    $width = imagesx($source_image); 
    $height = imagesy($source_image); 

    //even if height is calculated automatically using 
    $desired_height = floor($height * ($desired_width/$width)); 

    $virtual_image = imagecreatetruecolor($desired_width, $desired_height); 
    imagecopyresampled($virtual_image, $source_image, 0, 0, 0, 0, $desired_width, $desired_height, $width, $height); 
    imagejpeg($virtual_image, $dest); 
}

來源

2013-03-02 Rahul R

代碼

 function make_thumb($src, $dest, $desired_width) { $source_image = imagecreatefromjpeg($src); $width = imagesx($source_image); $height = imagesy($source_image); //even if height is calculated automatically using $desired_height = floor($height * ($desired_width/$width)); $virtual_image = imagecreatetruecolor($desired_width, $desired_height); imagecopyresampled($virtual_image, $source_image, 0, 0, 0, 0, $desired_width, $desired_height, $width, $height); imagejpeg($virtual_image, $dest); }

– 2013-03-02 15:54:11

可以使用Class SimpleImage，如：

// Usage: 
// Load the original image 
$image = new SimpleImage('lemon.jpg'); 

// Resize the image to 600px width and the proportional height 
$image->resizeToWidth(600); 
$image->save('lemon_resized.jpg');

你可以找到這個class這裏githubhttps://gist.github.com/miguelxt/908143

來源

2013-03-02 16:05:24

我寫了一個腳本來製作風景或肖像圖像的大拇指。可能這會幫助你

<?php 
    $thumbWidth = 200; // can change it to whatever required 
    $thumbHeight = 200; // can change it to whatever required 

    $img = imagecreatefromstring(file_get_contents('SAM_1883.JPG')); 
    $imgWidth = imagesx($img); 
    $imgHeight = imagesy($img); 

    $imgStart_x = 0; 
    $imgStart_y = 0; 
    $imgEnd_x = $imgWidth; 
    $imgEnd_y = $imgHeight; 

    if($imgWidth > $imgHeight){ 
     $diff = $imgWidth - $imgHeight; 
     $imgStart_x = $diff/2; 
     $imgEnd_x = $imgWidth - $diff; 
    }else{ 
     $diff = $imgHeight - $imgWidth; 
     $imgEnd_y = $imgHeight - $diff; 
    } 

    $dest = imagecreatetruecolor($thumbHeight,$thumbHeight); 
    imagecopyresized($dest, $img, 0, 0, $imgStart_x, $imgStart_y, $thumbWidth, $thumbHeight, $imgEnd_x, $imgEnd_y); 
    imagePNG($dest,'abc'.rand(0,9999).'.png'); 
?>

但是，您可以根據您的要求更改來源，thumbWidth，thumbHeight和拇指目的地。

來源

2013-03-02 16:46:58

https://github.com/lencioni/SLIR可以隨時調整圖像大小。它會將圖像緩存在服務器上，並使其可在瀏覽器和代理服務器上緩存。調整大小會在加載圖像時發生，而不是在加載HTML時加快HTML加載速度。

來源

2015-06-02 16:08:49 Slawa

創建完美的縮略圖

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