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Embed binary IPTC data into a JPEG image
(PHP 4, PHP 5)
Code Examples / Notes » iptcembedevan
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
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). rupix
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 bob
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][$i]); } collord
Regarding issues with photoshop IPTC... Photoshop actually prefers a different embedded metadata format, XMP, which is RDF-based. When Photoshop manages metadata via File Info, what you're actually doing is manipulating RDF in a "photoshop" namespace as well as the standard Dublin Core (dc) namespace, and a couple others. When a file is written that supports IPTC, the equivalent fields e.g. copyright, keywords, etc. are serialized into the IPTC block. So, if one manipulates the IPTC block of a Photoshop-generated image and leaves the XMP block alone, it's my guess that Photoshop will treat data from the XMP as authoritative. HTH, jerritt pprem
Reading and changing IPTC make no problem with the PEAR function, but recent Adobe software add XMP datas on JPEG files and read them instead of IPTC datas. If you need to change IPTC on a JPEG file and want Adobe PS7 read them, you have two solutions: - writing XMP and IPTC datas - writing IPTC datas and removing XMP datas Because I've not enough time to work on XMP datas, I've choosen the second solution. Here is the result of this work: <?php // removing XMP datas from a JPEG file // (c) Patrick Premartin 19/02/2004 function XMP_remove_from_jpeg (&$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 mémoire $f_in = fopen ($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 :-) muguran
Pay attention not add codes with length of value equal to 0; the behavior could be strange... (e.g. $iptc_old["2#015"][0] = "") bryce fisher
In Thomas's wonderful code snippet below, the second parameter needs to be changed to "$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); } ?> jb
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); dj dot cyberdance
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
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, $endchar); ?> in the XMP_remove_from_jpeg function jofr
I found out, that iptcembed does not overwrite the full IPTC-Tags from Photoshop. If you modify the IPTC-Tag with iptcembed, Photoshop will still show you the old IPTC-Tag. Programs like Fotostation works fine. JO pprem
I confirm: Photoshop 7 and other recent Adobe programs use XMP instead of IPTC. They write datas in IPTC format only for compatibility with older programs, but use only XMP. I'm working on a program that write XMP and IPTC together and probably post it here as soon as possible. thomas
here is a small code to remove all header from a jpg file, including IPTC, Exif, XMP... function remove_XMP($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. knut dot satre dot nospam
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 |
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