GD and Image 函数
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iptcembed

(PHP 4, PHP 5)

iptcembed — 将二进制 IPTC 数据嵌入到一幅 JPEG 图像中

说明

mixed iptcembed ( string $iptcdata , string $jpeg_file_name [, int $spool ] )
GD and Image 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: 将二进制 IPTC 数据嵌入到一幅 JPEG 图像中

用户评论:

micheall at inthemdl dot net (29-May-2011 01:00)

While using the class file noted below you'll notice setting an array of keywords with the set() function will not work.  Try this instead:
<?php
        function set($tag, $data) {
            if(is_array($data)){
                $c = count($data);
                for ($i=0; $i <$c; $i++){
                       $this->meta["2#$tag"][$i] = $data[$i];
                }               
                $this->hasmeta=true;
            } else {
                $this->meta["2#$tag"]= Array( $data );
                $this->hasmeta=true;
            }
        }
?>

Jarek Milewski (22-Apr-2011 11:37)

To remove all EXIF, XMP etc. tags from a jpeg file you need no resampling (which, by the way, may give you memory problems). It's just enough to recreate the image, presumably with 100% quality in order not to loose anything. The code is as simple as that:

<?php
    $img = imagecreatefromjpeg ($path);
    imagejpeg ($img, $path, 100);
    imagedestroy ($img);
?>

soporte at etic dot com dot mx (29-Mar-2011 02:50)

I just found an error while trying to write several keywords (an array) with the binary function... please consider using the following:

<?php
function binary() {
            $iptc_new = '';
            foreach (array_keys($this->meta) as $s) {
                $tag = str_replace("2#", "", $s);
                if(count($this->meta[$s])>1){
                    foreach ($this->meta[$s] as $row){
                        $iptc_new .= $this->iptc_maketag(2, $tag, $row);
                    }
                }else {
                    $iptc_new .= $this->iptc_maketag(2, $tag, $this->meta[$s][0]);
                }
            }
            return $iptc_new;
        }
?>

Christoph Tavan (16-Dec-2010 11:30)

For everybody having issues with unicode (UTF-8) text in IPTC fields, set the "Coded Character Set"-field in the envelop (1:90, see http://www.iptc.org/std/IIM/4.1/specification/IIMV4.1.pdf).

This can be accomplished by starting the $data-block with the following lines:

<?php
// These two lines ensure that UTF8-Encoding will work (set the 1:90 field in the envelop)
// @see http://cpanforum.com/threads/2114 for a hint
$utf8seq = chr(0x1b) . chr(0x25) . chr(0x47);
$length = strlen($utf8seq);
$data = chr(0x1C) . chr(1) . chr('090') . chr($length >> 8) . chr($length & 0xFF) . $utf8seq;
?>

After that you can continue like in the example:

<?php
foreach($iptc as $tag => $string)
{
    $tag = substr($tag, 2);
    $data .= iptc_make_tag(2, $tag, $string);
}
?>

critto at o2 dot pl (14-Jul-2010 02:25)

If you want just to copy the IPTC data, eg. at the thumbnail creation, you don't have to parse the binary IPTC data into array and back; just do this:

<?php
$fullFilePath='photo1.jpg';
$fullPathThumb = 'photo1thumb.jpg';
$imagesize        =    getImageSize($fullFilePath, $info);
if(isset($info['APP13'])){
    $content    =    iptcembed($info['APP13'], $fullPathThumb);
   @unlink($fullPathThumb);
   $fw = fopen($fullPathThumb, 'w');
   fwrite($fw, $content);
   fclose($fw);
}
?>

support at image-host-script dot com (23-Sep-2008 07:39)

A class I recently wrote for manipulating IPTC data in an jpeg images. It does the job for editing exisiting data too, in easy manner. It is just a compilation of examples into single class.

<?

    /************************************************************\
   
        IPTC EASY 1.0 - IPTC data manipulator for JPEG images
           
        All reserved www.image-host-script.com
       
        Sep 15, 2008
   
    \************************************************************/

    DEFINE('IPTC_OBJECT_NAME', '005');
    DEFINE('IPTC_EDIT_STATUS', '007');
    DEFINE('IPTC_PRIORITY', '010');
    DEFINE('IPTC_CATEGORY', '015');
    DEFINE('IPTC_SUPPLEMENTAL_CATEGORY', '020');
    DEFINE('IPTC_FIXTURE_IDENTIFIER', '022');
    DEFINE('IPTC_KEYWORDS', '025');
    DEFINE('IPTC_RELEASE_DATE', '030');
    DEFINE('IPTC_RELEASE_TIME', '035');
    DEFINE('IPTC_SPECIAL_INSTRUCTIONS', '040');
    DEFINE('IPTC_REFERENCE_SERVICE', '045');
    DEFINE('IPTC_REFERENCE_DATE', '047');
    DEFINE('IPTC_REFERENCE_NUMBER', '050');
    DEFINE('IPTC_CREATED_DATE', '055');
    DEFINE('IPTC_CREATED_TIME', '060');
    DEFINE('IPTC_ORIGINATING_PROGRAM', '065');
    DEFINE('IPTC_PROGRAM_VERSION', '070');
    DEFINE('IPTC_OBJECT_CYCLE', '075');
    DEFINE('IPTC_BYLINE', '080');
    DEFINE('IPTC_BYLINE_TITLE', '085');
    DEFINE('IPTC_CITY', '090');
    DEFINE('IPTC_PROVINCE_STATE', '095');
    DEFINE('IPTC_COUNTRY_CODE', '100');
    DEFINE('IPTC_COUNTRY', '101');
    DEFINE('IPTC_ORIGINAL_TRANSMISSION_REFERENCE',     '103');
    DEFINE('IPTC_HEADLINE', '105');
    DEFINE('IPTC_CREDIT', '110');
    DEFINE('IPTC_SOURCE', '115');
    DEFINE('IPTC_COPYRIGHT_STRING', '116');
    DEFINE('IPTC_CAPTION', '120');
    DEFINE('IPTC_LOCAL_CAPTION', '121');

    class iptc {
        var $meta=Array();
        var $hasmeta=false;
        var $file=false;
       
       
        function iptc($filename) {
            $size = getimagesize($filename,$info);
            $this->hasmeta = isset($info["APP13"]);
            if($this->hasmeta)
                $this->meta = iptcparse ($info["APP13"]);
            $this->file = $filename;
        }
        function set($tag, $data) {
            $this->meta ["2#$tag"]= Array( $data );
            $this->hasmeta=true;
        }
        function get($tag) {
            return isset($this->meta["2#$tag"]) ? $this->meta["2#$tag"][0] : false;
        }
       
        function dump() {
            print_r($this->meta);
        }
        function binary() {
            $iptc_new = '';
            foreach (array_keys($this->meta) as $s) {
                $tag = str_replace("2#", "", $s);
                $iptc_new .= $this->iptc_maketag(2, $tag, $this->meta[$s][0]);
            }       
            return $iptc_new;   
        }
        function iptc_maketag($rec,$dat,$val) {
            $len = strlen($val);
            if ($len < 0x8000) {
                   return chr(0x1c).chr($rec).chr($dat).
                   chr($len >> 8).
                   chr($len & 0xff).
                   $val;
            } else {
                   return chr(0x1c).chr($rec).chr($dat).
                   chr(0x80).chr(0x04).
                   chr(($len >> 24) & 0xff).
                   chr(($len >> 16) & 0xff).
                   chr(($len >> 8 ) & 0xff).
                   chr(($len ) & 0xff).
                   $val;
                  
            }
        }   
        function write() {
            if(!function_exists('iptcembed')) return false;
            $mode = 0;
            $content = iptcembed($this->binary(), $this->file, $mode);   
            $filename = $this->file;
               
            @unlink($filename); #delete if exists
           
            $fp = fopen($filename, "w");
            fwrite($fp, $content);
            fclose($fp);
        }   
       
        #requires GD library installed
        function removeAllTags() {
            $this->hasmeta=false;
            $this->meta=Array();
            $img = imagecreatefromstring(implode(file($this->file)));
            @unlink($this->file); #delete if exists
            imagejpeg($img,$this->file,100);
        }
    };
   
   
?>

Example read copyright string:

$i = new iptc("test.jpg");
echo $i->get(IPTC_COPYRIGHT_STRING);

Update copyright statement:
$i = new iptc("test.jpg");
echo $i->set(IPTC_COPYRIGHT_STRING,"Here goes the new data");
$i->write();

NOTE1: Data may be anything, even a binary file. I have so far tested and embedded an MS-Excel file directly to jpeg and it worked just perfect.

NOTE2: The writing purpose, it uses GD Library.

Further imporvements / changes may be followed at www.image-host-script.com

I hope it helps.
Ali..

jb at ibbeck dot de (04-Oct-2007 03:40)

If you have a file without any IPTC record, you can add a new, empty one by calling iptcembed with an empty string as first argument, like this:

$buffer = iptcembed("",$imagename,0);
$fp = fopen($imagename,"w");
fwrite($fp,$buffer);
fclose($fp);

Bryce Fisher (04-Jul-2007 05:55)

In Thomas's wonderful code snippet below, the second parameter needs to be changed to "$filename", otherwise the script has no write the file. So the code should read:

<?php
//This function removes all header data from a JPG
function remove_XMP($image_in, $filename) {
  $filename_in = addslashes($image_in);
  list($width, $height) = getimagesize($filename_in);
  $image_dest = imagecreatetruecolor($width, $height);
  $image = imagecreatefromjpeg($filename_in);
  imagecopyresampled($image_dest, $image, 0, 0, 0, 0,  $width, $height,$width, $height);
  imagejpeg($image_dest, $filename);
}
?>

thomas at anakrome dot net (04-Jul-2005 05:02)

here is a small code to remove all header from a jpg file, including IPTC, Exif, XMP...

function remove_XMP($image_in, $image_dest) {
  $filename_in = addslashes($image_in);
  list($width, $height) = getimagesize($filename_in);
  $image_dest = imagecreatetruecolor($width, $height);
  $image = imagecreatefromjpeg($filename_in);
  imagecopyresampled($image_dest, $image, 0, 0, 0, 0,  $width, $height,
  $width, $height);
  imagejpeg($image_dest, $filename);
}

the problem comes from Photoshop CS cannot read IPTC if XMP is present.
removing XMP and other header _before_ adding IPTC with iptcembed is a good way.

muguran (13-May-2005 09:41)

Pay attention not add codes with length of value equal to 0; the behavior could be strange...
(e.g. $iptc_old["2#015"][0] = "")

evan at nospam dot ozhiker dot com (09-Aug-2004 05:53)

You might have noticed that several metadata fields in Photoshop are not available via IPTC.
Also, Photoshop now uses XMP for it's primary metadata, meaning IPTC is only read by Photoshop if XMP is not present.

I have written a library "PHP JPEG Metadata Toolkit" which bypasses this problem as it allows reading, writing and interpreting of virtually any type of metadata, including XMP, IPTC and EXIF.

Try it out, and download it at:
http://www.ozhiker.com/electronics/pjmt/index.html

dj dot cyberdance at gmx dot at (30-May-2004 02:47)

Yep it's me again :-) After some time I spent searching around for other possibilities to write IPTC fields to JPEG files I found this one:

http://www.zonageek.com/software/php/jpeg/index.php

This one seems to work pretty fine, remember that you have to install PEAR to get this running (Debian package php4-pear).

dj dot cyberdance at gmx dot at (06-May-2004 12:29)

I've spent a whole day debugging my code (that was based on the example below, posted by knut) until I found out, that iptcembed() only works if the image specified in jpeg_file_name already has IPTC fields included.

That means that you cannot write IPTC fields in a jpeg file without preexisting IPTC information in it.

Updating of IPTC fields also worked only with a few files, I don't really know what it depends on whether it works or not. (Well, it depends on the IPTC header, that's for sure :-)

I'm using PHP 4.2.1, maybe this is fixed in more recent versions, but I don't believe...

Nevertheless, here's some piece of code I tried:

I replaced the line

<?
$iptc_old = iptcparse ($info["APP13"]);
?>

from knut's example below with

<?
$iptc_old["2#000"][0] = chr(0) . chr(2);
?>

This creates just an empty "Header" according to the IPTC spec. This one also is included when getting IPTC info using iptcparse(). So my intention was to create a fully new header, but when using iptcembed() afterwards, the file size of the new file was a little smaller than the original but without any IPTC info stored in it.

pprem at pprem dot net (20-Feb-2004 06:04)

I've a problem with the ltrim fucntion: sometimes it remove more characters than it must, so it's better to delete the line

<?
//   $image = rtrim ($image, $endchar);
?>

in the XMP_remove_from_jpeg function

pprem at pprem dot net (20-Feb-2004 12:10)

Reading and changing IPTC make no problem with the PEAR function, but recent Adobe software add XMP datas on JPEG files and read them instead of IPTC datas. If you need to change IPTC on a JPEG file and want Adobe PS7 read them, you have two solutions:
- writing XMP and IPTC datas
- writing IPTC datas and removing XMP datas

Because I've not enough time to work on XMP datas, I've choosen the second solution. Here is the result of this work:

<?php
// removing XMP datas from a JPEG file
// (c) Patrick Premartin 19/02/2004

function XMP_remove_from_jpeg (&$image) {
  $xmp_str = "http://ns.adobe.com/xap/1.0/";
  $xmp_end = "<?xpacket end='w'?>";
  $n_str = strpos ($image, $xmp_str);
  $n_end = strpos ($image, $xmp_end);
  if (($n_str !== false) && ($n_end !== false) && ($n_str < $n_end)) {
    $n_str -= 4; // FF E1 .x. .y. (xy is the length of the XMP block -> first char of this block
    $n_end += strlen ($xmp_end)-1; // last char of this block
    $endchar = $image [$n_str-1];
    if ($endchar == " ") {
      $endchar = "A";
    } else {
      $endchar = " ";
    }
    $xmp_len = $n_end-$n_str+1;
    $img_len = strlen ($image);
    $len = $img_len - $xmp_len;
    for ($i = $n_str; $i < $img_len; $i ++) {
      if ($i < $len) {
        $image [$i] = $image [$i+$xmp_len];
      } else {
        $image [$i] = $endchar;
      }
    }
    $image = rtrim ($image, $endchar);
    return true;
  } else {
    return false;
  }
}

function XMP_remove_from_jpegfile ($filename_in, $filename_out="") {
  if (""==$filename_out) {
    $filename_out = $filename_in;
  }
  if ((""!=$filename_in) && (file_exists ($filename_in)) && (($len_in = filesize ($filename_in)) > 0)) {
    // chargement du fichier en mmoire
    $f_in = fopen ($filename_in, "rb");
    $img = fread ($f_in, $len_in);
    fclose ($f_in);
    // suppression du XMP de l'image
    if (XMP_remove_from_jpeg ($img)) {
      // enregistrement du fichier sur disque
      $f_out = fopen ($filename_out, "wb");
      fwrite ($f_out, $img, strlen ($img));
      fclose ($f_out);
    }
  }
}

XMP_remove_from_jpegfile ("ps7_hr.jpg", "ps7_hr_.jpg"); // create a new picture without XMP datas

XMP_remove_from_jpegfile ("ps8_hr.jpg"); // replace the existing file
?>

In the future, I'll work on changing XMP datas and IPTC in the same way and will publish it ther or as a in PEAR.

May the force be with us :-)

pprem (15-Feb-2004 03:00)

I confirm: Photoshop 7 and other recent Adobe programs use XMP instead of IPTC. They write datas in IPTC format only for compatibility with older programs, but use only XMP.

I'm working on a program that write XMP and IPTC together and probably post it here as soon as possible.

collord (27-Jan-2004 09:20)

Regarding issues with photoshop IPTC... Photoshop actually prefers a different embedded metadata format, XMP, which is RDF-based. When Photoshop manages metadata via File Info, what you're actually doing is manipulating RDF in a "photoshop" namespace as well as the standard Dublin Core (dc) namespace, and a couple others. When a file is written that supports IPTC, the equivalent fields e.g. copyright, keywords, etc. are serialized into the IPTC block.

So, if one manipulates the IPTC block of a Photoshop-generated image and leaves the XMP block alone, it's my guess that Photoshop will treat data from the XMP as authoritative.

HTH, jerritt

jofr at gmx dot com (29-Dec-2003 06:42)

I found out, that iptcembed does not overwrite the full IPTC-Tags from Photoshop.
If you modify the IPTC-Tag with iptcembed, Photoshop will still show you the old IPTC-Tag.
Programs like Fotostation works fine.

JO

bob at lucid-systems dot com (22-Aug-2002 11:37)

The above example doesn't handle keywords properly. The 'create string' code needs to be modified to cater for the array:

$c = count ($iptc_old[$s]);
for ($i=0; $i <$c; $i++)
    {
    $iptc_new .= iptc_maketag(2, $tag, $iptc_old[$s][$i]);
    }

rupix at rediffmail dot com (28-Jan-2002 12:24)

Windows makes a distinction between 'text' and 'binary' files. So if you run the above code on a windows platform, it will produce a garbled image. To overcome this problem put the file mode in fopen() as 'wb' instead of 'w'.

Cheerio !!

Rupinder

knut dot satre dot NoSpam at No_Spam dot nord dot no (27-Jan-2002 11:45)

Example to read IPTC text from an image, changing the text an write to a new file using the functions iptcparse and iptcembed.
 
Also a list of the most common IPTC fields.

<?
// original file name
$image_name_old = "test.jpg";

// New file name
$image_name_new = "test2.jpg";

// Reads the IPTC text in to the array '$iptc'
// The number after the '#' is the IPTC field
// Ex: $iptc["2#120"][0] is Caption
// $iptc["2#055"][0]; is Creation date
$size = GetImageSize ("$image_name_old",&$info);
$iptc_old = iptcparse ($info["APP13"]);

// Adding or replacing IPTC text
   // This ex. replace the original category or create it if it dos not exist
   $iptc_old["2#015"][0] = "Sport";
   // .. and adding more text to the original caption
   $iptc_old["2#120"][0] .= " More caption text";

   // Making the new IPTC string
   foreach (array_keys($iptc_old) as $s){
      // Finds the IPTC numbers
      $tag = str_replace("2#", "", $s);
      // Creating the string
      $iptc_new .= iptc_maketag(2, $tag, $iptc_old[$s][0]);
   }

// The original file and the new IPTC Text into $content
// Mode 0 - puts the image file into $content
// Mode 1 - puts the image file into $content and directly to the web client
// Mode 2 - puts the image file to web client
$mode = 0;
$content = iptcembed($iptc_new, $image_name_old, $mode);

// writes the new file
$fp = fopen($image_name_new, "w");
fwrite($fp, $content);
fclose($fp);

// Function to format the new IPTC text, (thanks to Thies C. Arntzen)
function iptc_maketag($rec,$dat,$val){
         $len = strlen($val);
         if ($len < 0x8000)
                  return chr(0x1c).chr($rec).chr($dat).
                  chr($len >> 8).
                  chr($len & 0xff).
                  $val;
         else
                  return chr(0x1c).chr($rec).chr($dat).
                  chr(0x80).chr(0x04).
                  chr(($len >> 24) & 0xff).
                  chr(($len >> 16) & 0xff).
                  chr(($len >> 8 ) & 0xff).
                  chr(($len ) & 0xff).
                  $val;
}

?>

--- The most common IPTC Fileds
005 - Object Name
007 - Edit Status
010 - Priority
015 - Category
020 - Supplemental Category
022 - Fixture Identifier
025 - Keywords
030 - Release Date
035 - Release Time
040 - Special Instructions
045 - Reference Service
047 - Reference Date
050 - Reference Number
055 - Created Date
060 - Created Time
065 - Originating Program
070 - Program Version
075 - Object Cycle
080 - Byline
085 - Byline Title
090 - City
095 - Province State
100 - Country Code
101 - Country
103 - Original Transmission Reference
105 - Headline
110 - Credit
115 - Source
116 - Copyright String
120 - Caption
121 - Local Caption