The PHP JPEG Metadata Toolkit

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Further Work Required

If you would like to contribute, and extend the toolkit, here are some things that are yet to be done

• Obtain format specifications for more Makernotes
• Make it easier to extract just the values you want
• Try to Reduce the memory required
• In Photoshop_File_Info.php line 239 and 416 the following warning is possible: Invalid argument supplied for foreach()
• Find out definitions of Print Image Matching Info tags - possibly - pimContrast, pimBrightness, pimColorBalance, pimSaturation and pimSharpness
• Obtain a copy of the Photoshop CS File Format Specification
• Add the support for Windows XP comments - temporarily done in EXIF_new.php and EXIF_Tags_new.php - Need to test writing of these tags
• Find out what the adobe-xap-filters tag means in XMP
• Fully Test Functions to write EXIF data
• Figure out a way to allow EXIF to function normally with HTTP and FTP wrappers
• Implement decoding of Adobe segment
• Find definition of Ducky App12 segment and implement decoding

Possible definition of ducky App12

Contents
of APP12 'Ducky' (5 ? ? ? ?)
00 ? 01 ? 00 ? 04 ? 00 ? 00 ? 00 (7) (always uniformity)
Compression index (1): When compressing designated compression index (00H - 64h)
00(1)
Presence of copyright information (1): 0: It is not ? 3: It is,
< < Or less there is copyright information, only when > >
? ? ? ? length (2): Length of ? ? ? ? below -2
00?00(2)
The number of letters (2)
Copyright information (the number of 2* letters): It enters with the Unicode
00 ? 00 (2) 

• check for short <? tags which are not always supported
• Implement decoding of Apple plist segment
• Implement decoding of ICC Profiles
• Implement EXIF decoding of Device Setting Description field
• Implement EXIF decoding of SpatialFrequencyResponse field
• In IPTC.php, fix Typos - 2:35 should be 2:38 , and 2:4 ObjectAttributeReference is missing
• Strings are currently assumed to be null terminated, which may not be the case in EXIF.php near line 1363
• In EXIF.php, there are a couple of places where tags starting with <h3> end with </h2>
.
• Fix all HTML tags so they are XHTML compliant
• In EXIF_Makernote.php, put code in function, to avoid creating or using global variables
• Move the GPS IFD tag into the TIFF IFD not the EXIF IFD in EXIF_Tags.php
• Implement EXIF decoding of User comment
• Implement EXIF decoding of OECF field
• Implement EXIF decoding of SubjectArea field
• Implement EXIF decoding of IFD datatype Float
• Implement EXIF decoding of IFD datatype Double
• Test those IPTC fields which are not used by Photoshop
• Implement support for IPTC Extended Dataset record
• Implement decoding of IPTC record 1:90 ( Coded Character Set )
• Implement Display of Rasterised Caption for IPTC record 2:125
• Implement JFIF Thumbnail display
• Implement JFXX one and three bytes per pixel thumbnail decoding
• Implement decoding for the many Photoshop IRB resources which are currently not supported
• Find out what Photoshop IRB resources 1061, 1062 & 1064 are
• Test whether the URL List field in Photoshop IRB works - No sample files available
• Test get_Photoshop_IRB and put_Photoshop_IRB with multiple APP13 segments
• Test the Unicode UTF-16 functions that have not been tested fully
• Test the many RDF items that have not yet been tested - only those used by photoshop 7.0 and CS have been tested
• Implement decoding of One Byte Per Pixel encoded JFXX Thumbnail
• Implement decoding of Three Bytes Per Pixel encoded JFXX Thumbnail
• Add a put_EXIF_TIFF function