iptcembed()

(PHP 4, PHP 5, PHP 7)

将二进制 IPTC 数据嵌入到一幅 JPEG 图像中

说明

Embeds binary IPTC data into a JPEG image.

参数

The data to be written.

Path to the JPEG image.

Spool flag. If the spool flag is over 2 then the JPEG will be returned as a string.

返回值

If success and spool flag is lower than 2 then the JPEG will not be returned as a string, FALSE on errors.

范例

Embedding IPTC data into a JPEG

注释

此函数不需要 GD 图象库。

The following code embeds both IPTC APP segment 13 and EXIF APP segment 1 data from a source file and embeds it into a destination file. This overcomes the limitation where the iptcembed statement does not seem to embed EXIF data, only IPTC data.
function transferIptcExif2File($srcfile, $destfile) {
  // Function transfers EXIF (APP1) and IPTC (APP13) from $srcfile and adds it to $destfile
  // JPEG file has format 0xFFD8 + [APP0] + [APP1] + ... [APP15] +  where [APPi] are optional
  // Segment APPi (where i=0x0 to 0xF) has format 0xFFEi + 0xMM + 0xLL +  (where 0xMM is 
  //  most significant 8 bits of (strlen() + 2) and 0xLL is the least significant 8 bits 
  //  of (strlen() + 2) 
  if (file_exists($srcfile) && file_exists($destfile)) {
    $srcsize = @getimagesize($srcfile, $imageinfo);
    // Prepare EXIF data bytes from source file
    $exifdata = (is_array($imageinfo) && key_exists("APP1", $imageinfo)) ? $imageinfo['APP1'] : null;
    if ($exifdata) {
      $exiflength = strlen($exifdata) + 2;
      if ($exiflength > 0xFFFF) return false;
      // Construct EXIF segment
      $exifdata = chr(0xFF) . chr(0xE1) . chr(($exiflength >> 8) & 0xFF) . chr($exiflength & 0xFF) . $exifdata;
    }
    // Prepare IPTC data bytes from source file
    $iptcdata = (is_array($imageinfo) && key_exists("APP13", $imageinfo)) ? $imageinfo['APP13'] : null;
    if ($iptcdata) {
      $iptclength = strlen($iptcdata) + 2;
      if ($iptclength > 0xFFFF) return false;
      // Construct IPTC segment
      $iptcdata = chr(0xFF) . chr(0xED) . chr(($iptclength >> 8) & 0xFF) . chr($iptclength & 0xFF) . $iptcdata;
    }
    $destfilecontent = @file_get_contents($destfile);
    if (!$destfilecontent) return false;
    if (strlen($destfilecontent) > 0) {
      $destfilecontent = substr($destfilecontent, 2);
      $portiontoadd = chr(0xFF) . chr(0xD8);     // Variable accumulates new & original IPTC application segments
      $exifadded = !$exifdata;
      $iptcadded = !$iptcdata;
      while ((substr($destfilecontent, 0, 2) & 0xFFF0) === 0xFFE0) {
        $segmentlen = (substr($destfilecontent, 2, 2) & 0xFFFF);
        $iptcsegmentnumber = (substr($destfilecontent, 1, 1) & 0x0F);  // Last 4 bits of second byte is IPTC segment #
        if ($segmentlen 
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 :-)

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).

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.

--- 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

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:

After that you can continue like in the example: 

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: 

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