Question

你好，我需要帮助。

<form action="sample.php" method="POST" enctype="multipart/form-data">
<input type="file" name="file">
<input type="submit" name="submit">
</form>

然后，当我点击提交时，图片的文件大小将最小化。

例如。

Gaara.JPG =文件大小：1.50mb;

但是当我上传文件大小时，它会减少。

赞=文件大小：600kb;或者不到。

感谢

Answer 1

Compress images on client side before uploading或Client side file compression

Answer 2

<?php
############ Configuration ##############
$thumb_square_size      = 200; //Thumbnails will be cropped to 200x200 pixels
$max_image_size         = 5000; //Maximum image size (height and width)
$thumb_prefix           = "thumb_"; //Normal thumb Prefix
$destination_folder     = 'uploads/'; //upload directory ends with / (slash)
$jpeg_quality           = 90; //jpeg quality
##########################################

//continue only if $_POST is set and it is a Ajax request
if(isset($_POST['image_file']) && isset($_SERVER['HTTP_X_REQUESTED_WITH']) &&     strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest'){

// check $_FILES['ImageFile'] not empty
if(!isset($_FILES['image_file']) || !is_uploaded_file($_FILES['image_file']    ['tmp_name'])){
        die('Image file is Missing!'); // output error when above checks     fail.
}

//uploaded file info we need to proceed
$image_name = $_FILES['image_file']['name']; //file name
$image_size = $_FILES['image_file']['size']; //file size
$image_temp = $_FILES['image_file']['tmp_name']; //file temp

$image_size_info    = getimagesize($image_temp); //get image size

if($image_size_info){
    $image_width        = $image_size_info[0]; //image width
    $image_height       = $image_size_info[1]; //image height
    $image_type         = $image_size_info['mime']; //image type
}else{
    die("Make sure image file is valid!");
}

//switch statement below checks allowed image type 
//as well as creates new image from given file 
switch($image_type){
    case 'image/png':
        $image_res =  imagecreatefrompng($image_temp); break;
    case 'image/gif':
        $image_res =  imagecreatefromgif($image_temp); break;           
    case 'image/jpeg': case 'image/pjpeg':
        $image_res = imagecreatefromjpeg($image_temp); break;
    default:
        $image_res = false;
}

if($image_res){
    //Get file extension and name to construct new file name 
    $image_info = pathinfo($image_name);
    $image_extension = strtolower($image_info["extension"]); //image extension
    $image_name_only = strtolower($image_info["filename"]);//file name only, no     extension

    //create a random name for new image (Eg: fileName_293749.jpg) ;
    $new_file_name = $image_name_only. '_' .  rand(0, 9999999999) . '.' .     $image_extension;

    //folder path to save resized images and thumbnails
    $thumb_save_folder  = $destination_folder . $thumb_prefix .     $new_file_name; 
    $image_save_folder  = $destination_folder . $new_file_name;

    //call normal_resize_image() function to proportionally resize image
    if(normal_resize_image($image_res, $image_save_folder, $image_type,     $max_image_size, $image_width, $image_height, $jpeg_quality))
    {
        //call crop_image_square() function to create square thumbnails
        if(!crop_image_square($image_res, $thumb_save_folder, $image_type,     $thumb_square_size, $image_width, $image_height, $jpeg_quality))
        {
            die('Error Creating thumbnail');
        }

        /* We have succesfully resized and created thumbnail image
        We can now output image to user's browser or store information in     the database*/
        echo '<div align="center">';
        echo '<img src="uploads/'.$thumb_prefix . $new_file_name.'"     alt="Thumbnail">';
        echo '<br />';
        echo '<img src="uploads/'. $new_file_name.'" alt="Resized Image">';
        echo '</div>';
    }

    imagedestroy($image_res); //freeup memory
}
}

＆GT;

Answer 3

你可以尝试使用Image Magician脚本，你可以裁剪，调整大小，添加水印，边框以及做其他事情。这是链接http://phpimagemagician.jarrodoberto.com/

样本用法：

include_once ('.../php_image_magician.php');
$path = "your/media_media_upload_directory/";
$destination = "your_thumbnails/media_upload/directory/";
 if(move_uploaded_file($tmp, $path.$actual_image_name)) {
  $magicianObj = new imageLib($path.$actual_image_name);
   $magicianObj -> resizeImage(630, 600, 'landscape');
   $magicianObj -> addWatermark('your/watermark/folder/watermark.png', 'l', 5);
   $magicianObj -> saveImage($path.$actual_image_name, 70);
    $magicianObj -> reset();
   $magicianObj -> resizeImage(300, 300, 'crop-tl', true);
   $magicianObj -> saveImage($destination.$actual_image_name);
 }

使用此示例将文件从tmp文件夹移动到媒体文件夹后我调整大小，添加水印然后裁剪缩略图，在saveImage操作中，您可以选择将质量从100降低到无论你想要什么，在这个例子中质量是70。

如何在上传图像时优化图像的文件大小

3 个答案: