Exif 函数
在线手册：中文 英文
PHP手册

exif_thumbnail

(PHP 4 >= 4.2.0, PHP 5)

exif_thumbnail — 取得嵌入在 TIFF 或 JPEG 图像中的缩略图

说明

string exif_thumbnail ( string $filename [, int &$width [, int &$height [, int &$imagetype ]]] )

exif_thumbnail() 读取 TIFF 或 JPEG 图像中的嵌入缩略图。如果图像不包含缩略图则返回 FALSE。

If you want to deliver thumbnails through this function, you should send the mimetype information using the header() function.

It is possible that exif_thumbnail() cannot create an image but can determine its size. In this case, the return value is FALSE but width and height are set.

参数

filename

The name of the image file being read. This image contains an embedded thumbnail.

width

The return width of the returned thumbnail.

height

The returned height of the returned thumbnail.

imagetype

The returned image type of the returned thumbnail. This is either TIFF or JPEG.

返回值

Returns the embedded thumbnail, or FALSE if the image contains no thumbnail.

更新日志

版本 说明
4.3.0 The optional parameters width, height, and imagetype all became available.
4.3.0 May return thumbnails in the TIFF format.

范例

Example #1 exif_thumbnail() 例子

<?php
if (array_key_exists('file',$_REQUEST)) {
    $image = exif_thumbnail($_REQUEST['file'], $width, $height, $type);
} else {
    $image = false;
}
if ($image!==false) {
    header("Content-type: ".image_type_to_mime_type($type));
    echo $image;
    exit;
} else {
    // no thumbnail available, handle the error here
    echo "No thumbnail available";
}
?>

参见

Exif 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: 取得嵌入在 TIFF 或 JPEG 图像中的缩略图

用户评论:

thrustvector at &#39;gee&#39;mail dot com (29-Jul-2008 09:40)

If you've edited the image with image editing software and it no longer contains an exif thumbnail, I've created a script that will add one back into it, using the "PHP Exif Library": http://pel.sourceforge.net/index.php

<?php
require_once('../PEL/PelJpeg.php');
require_once('../PEL/PelIfd.php');
$fullpath = 'images/DSC_0013c.JPG';  # path of source image (does not contain an exif thumbnail)
     
$jpeg = new PelJpeg($fullpath);
 $exif = $jpeg->getExif();
 $tiff = $exif->getTiff();
 $ifd0 = $tiff->getIfd();        # need this so that we can later link it to the new IFD

 $ifd1 = $ifd0->getNextIfd();
if (!$ifd1) {        # Only create thumbnail if one doesn't exist (i.e. there is no IFD1)
    $ifd1 = new PelIfd(1);
    $ifd0->setNextIfd($ifd1); # point ifd0 to the new ifd1 (or else ifd1 will not be read)

    $original = ImageCreateFromString($jpeg->getBytes()); # create image resource of original
    $orig_w=imagesx($original);
    $orig_h=imagesy($original);
    $wmax = 160;
    $hmax = 120;

    if ($orig_w>$wmax || $orig_h>$hmax) {
        $thumb_w=$wmax;
        $thumb_h=$hmax;
        if ($thumb_w/$orig_w*$orig_h>$thumb_h)
            $thumb_w=round($thumb_h*$orig_w/$orig_h); # maintain aspect ratio
        else
            $thumb_h=round($thumb_w*$orig_h/$orig_w);
    }
    else { # only set the thumb's size if the original is larger than 'wmax'x'hmax'
        $thumb_w=$orig_w;
        $thumb_h=$orig_h;
    }

        # create image resource with thumbnail sizing
    $thumb=imagecreatetruecolor($thumb_w,$thumb_h);
        ## Resize original and copy to the blank thumb resource
    imagecopyresampled($thumb,$original,
                               0,0,0,0,$thumb_w,$thumb_h,$orig_w,$orig_h);

        # start writing output to buffer
    ob_start();       
        # outputs thumb resource contents to buffer
    ImageJpeg($thumb);   
        # create PelDataWindow from buffer thumb contents (and end output to buffer)
    $window = new PelDataWindow(ob_get_clean());

    if ($window) {   

        $ifd1->setThumbnail($window); # set window data as thumbnail in ifd1
        $outpath = $fullpath; # overwrite original jpg file
        file_put_contents($outpath, $jpeg->getBytes()); # write everything to output filename
            # Show thumbnail in file:
        echo '<img src="thumb_exif.php?image='.$outpath.'" border=0 alt="If you see this, it did not work"><br>';

       
    }
}
else {
    echo 'ifd1 already exists! (IFD1 is where the thumbnail is stored)<br>';
}
?>
<?php # This is the code in thumb_exif.php :
        $imgdat = exif_thumbnail($_REQUEST['image'], $width, $height, $type);
        header('Content-type: ' . image_type_to_mime_type($type));
        echo($imgdat);
?>

If you have a lot of such files, you can easily make a script that searches them out and adds thumbnails to their exif.

Miguel Vitorino (08-Oct-2007 02:37)

use this if you want to embed a thumbnail directly on the HTML page without writing it first to a file:

<?php
$image = exif_thumbnail($file, $width, $height, $type);

echo "<img  width='$width' height='$height' src='data:image/gif;base64,".base64_encode($image)."'>";
?>

(05-Jan-2007 02:23)

If you want to convert from TIFF to JPG you can use ImageMagick if it is installed in your server.

<?php
$exec = 'convert /path/to/file.tiff /path/to/file.jpg 2>&1';
@exec($exec, $exec_output, $exec_retval);

//possible error
print_r($exec_output)
?>

hanspeter dot debets at dendrite dot com (14-Jan-2005 02:35)

Great that the thumbnail can be in TIFF format (f.i. Kodak cameras have embedded thumbnail in TIFF) BUT I have not been able to show TIFF as an embedded image in HTML (using the <IMG...> tag). There seems to be no function in PHP to change TIFF to, lets say, JPG. (imagecreatefromstring gives a 'unknown datatype' error for the TIFF stream. So below sample works great for JPEG embedded thumbnail, but not for TIFF embedded (but then, maybe I did something wrong?):

test_exif.php:

<HTML>
<HEAD>
    <TITLE>Test EXIF Read  </TITLE>
</HEAD>
<BODY>
<?php
$image='P0000614.JPG';
echo("<B>". $image. "</B>:<BR><BR>\n");

$exif = exif_read_data($image, 'ANY_TAG',true);
if (!$exif===false)
{
    echo("Image contains headers<br><br>");
    echo("<A href=showthumb.php?image=" . $image ."> <IMG border=0 src=showthumb.php?image=" . $image ."></A><BR><BR>");

    foreach ($exif as $key => $section)
    {
        foreach ($section as $name => $val)
        {
            echo "$key.$name: $val<br>\n";
        }
    }
}
else
{
    echo("Sorry, image <B>".$image . "</B> does not contain (readable) EXIF data.");
}
?>
</BODY>
</HTML>

showthumb.php:

<?php
$imgdat = exif_thumbnail($_REQUEST['image'],$width, $height, $type);
header('Content-type: ' . image_type_to_mime_type($type));
echo($imgdat);
?>

When clicking on the <A> opens the TIFF image in the program that windows assigned to this type, but the JPEG opens in the browser.

I am using PHP 4.3.6 on windows iis 4 (yeah, I know.....)

Eric (14-Jun-2004 03:05)

This will allow you to manipulate the thumbnail image ($imgJpeg) using the various gd commands:

<?php
  if (($imgJpeg = exif_thumbnail($strImagePath)) === false)
    print "No Thumbnail!";
  else
    $imgJpeg = imageCreateFromString($imgJpeg);
?>

neothermic at ya[]o dot com ADD ho IN GAP (27-May-2004 06:01)

You can use the EXIF thumbnail function to extract the thumnails for use in an image gallery. I've found this to be faster than using other GD functions to convert the image to a smaller one then save it.

Here is the code I use to generate thumbnails. Remember, this is more of a utility script, although its simple to modifiy it for use...

<?PHP
set_time_limit(0); //use this to make sure the script doesn't time out on large number of images.
//error_reporting(E_NONE); //use this to disable errors in a production script

function getmicrotime() {
    $temparray=split(" ",microtime());
    $returntime=$temparray[0]+$temparray[1];
    return $returntime;
}

//lets make it slightly proper HTML. not valid, but can be changed quickly to be
echo "<html>
<head><title>Processing...</title></head>
<body>";

$maindir = "." ; //change this to what ever directory needs scanning
$mydir = opendir($maindir) ;
$starttime=getmicrotime();
$i = 0; //set the count of images processed to 0
while($fn = readdir($mydir)) //scan through the whole directory
    {//open while

        $startimagetime = getmicrotime();
        $ext = strtolower(substr($fn,strlen($fn)-3)); //get the extension of an image
        if ($ext == "jpg") {
            $i++; //increase the number of images processed
            echo $fn ." is being processed....<br>";
            flush(); //needed to display each image progress
           

            $image = exif_thumbnail($fn, $width, $height, $type);

            if ($image!==false) {
                    //if there is a good enough thumbnail to use, we have it here.
                    //extract it and put it in the file, call it [original image name].thumb.jpg
                 $handle = fopen ($fn.".thumb.jpg", 'a');
                 //write the thumbnail image
                 fwrite($handle, $image);
            } else {
                 // no thumbnail available, handle the error here
                 echo "No thumbnail available for file ".$fn."<br>";
            }
        }
}
closedir($mydir);
$endtime=getmicrotime();

echo "<br>All Images have been processed, script is finshed.<br>Total processing time: ";
print $endtime-$starttime;
echo "<br> Images processed: " .$i;
echo "</body>";
echo "</html>"

?>

Its a bit crude, I must admit, but it can easily be adapted to suit user.

NeoThermic