PHP 5.6.0 released

exif_thumbnail

(PHP 4 >= 4.2.0, PHP 5)

exif_thumbnailRécupère la miniature d'une image TIFF ou JPEG

Description

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

exif_thumbnail() lit la miniature de l'image TIFF ou JPEG dans le fichier filename.

Si vous voulez afficher des miniatures avec cette fonction, vous devez envoyer le bon type MIME avec la fonction header().

Il est possible que la fonction exif_thumbnail() n'arrive pas à créer l'image mais peut déterminer sa taille. Dans ce cas, la fonction retourne FALSE mais les paramètres width et height sont définis.

Liste de paramètres

filename

Le nom du fichier image à lire. Cette image contient une miniature.

width

La largeur retournée de la miniature retournée.

height

La hauteur retournée de la miniature retournée.

imagetype

Le type de l'image retourné de la miniature retournée. Peut être soit TIFF, soit JPEG.

Valeurs de retour

Retourne la miniature embarquée ou FALSE si l'image ne contient pas de miniature.

Exemples

Exemple #1 Exemple avec exif_thumbnail()

<?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 {
    
// aucune miniature de disponible, traitement de l'erreur ici
    
echo 'No thumbnail available';
}
?>

Voir aussi

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User Contributed Notes 5 notes

up
1
Eric
10 years ago
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);
?>
up
0
thrustvector at &#39;gee&#39;mail dot com
6 years ago
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.
up
0
Miguel Vitorino
6 years ago
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)."'>";
?>
up
0
Anonymous
7 years ago
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)
?>
up
0
hanspeter dot debets at dendrite dot com
9 years ago
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.....)
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