exif_tags.php

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<?php

/******************************************************************************
*
* Filename:     EXIF_Tags.php
*
* Description:  Provides definitions of the tags for TIFF, EXIF, Interoperability,
*               GPS, Meta, Kodak Special Effects and Kodak Borders IFD's.
*
* Author:       Evan Hunter
*
* Date:         1/8/2004
*
* Project:      PHP JPEG Metadata Toolkit
*
* Revision:     1.11
*
* Changes:      1.00 -> 1.11 : Added TIFF compression types ZIP, LZW and JPEG
*                              Added embedded XMP tag
*                              Added embedded Photoshop IRB tag
*                              Fixed GPS tags after testing
*
* URL:          http://electronics.ozhiker.com
*
* Copyright:    Copyright Evan Hunter 2004
*
* License:      This file is part of the PHP JPEG Metadata Toolkit.
*
*               The PHP JPEG Metadata Toolkit is free software; you can
*               redistribute it and/or modify it under the terms of the
*               GNU General Public License as published by the Free Software
*               Foundation; either version 2 of the License, or (at your
*               option) any later version.
*
*               The PHP JPEG Metadata Toolkit is distributed in the hope
*               that it will be useful, but WITHOUT ANY WARRANTY; without
*               even the implied warranty of MERCHANTABILITY or FITNESS
*               FOR A PARTICULAR PURPOSE.  See the GNU General Public License
*               for more details.
*
*               You should have received a copy of the GNU General Public
*               License along with the PHP JPEG Metadata Toolkit; if not,
*               write to the Free Software Foundation, Inc., 59 Temple
*               Place, Suite 330, Boston, MA  02111-1307  USA
*
*               If you require a different license for commercial or other
*               purposes, please contact the author: [e-mail]
*
******************************************************************************/






/******************************************************************************
* Global Variable:      IFD_Tag_Definitions
*
* Contents:     This array defines the fields for the TIFF, EXIF, Interoperability,
*               GPS, Meta, Kodak Special Effects and Kodak Borders IFD's.
*               It is indexed by the IFD Type, then the Tag number
*
******************************************************************************/

$GLOBALS[ "IFD_Tag_Definitions" ] = array(


/*****************************************************************************/
/*                                                                           */
/* TIFF Tags                                                                 */
/*                                                                           */
/*****************************************************************************/


"TIFF" => array(


256 => array(   'Name'  => "Image Width",
                'Description' => "Width of image in pixels (number of columns)",
                'Type'  => "Numeric",
                'Units' => "pixels" ),

257 => array(   'Name'  =>  "Image Length",
                'Description' => "Height of image in pixels (number of rows)",
                'Type'  => "Numeric",
                'Units' => "pixels" ),

258 => array(   'Name'  => "Bits Per Sample",
                'Description' => "Number of bits recorded per sample (a sample is usually one colour (Red, Green or Blue) of one pixel)",
                'Type'  => "Numeric",
                'Units' => "bits ( for each colour component )" ),


259 => array(   'Name' => "Compression",
                'Description' => "Specifies what type of compression is used 1 = uncompressed, 6 = JPEG compression (thumbnails only), Other = reserved",
                'Type' => "Lookup",
                1 => "Uncompressed",
                5 => "LZW Compression",
                6 => "Thumbnail compressed with JPEG compression",
                7 => "JPEG Compression",
                8 => "ZIP Compression" ),                                // Change: Added TIFF compression types as of version 1.11

262 => array(   'Name' =>  "Photometric Interpretation",
                'Description' => "Specifies Pixel Composition - 0 or 1 = monochrome, 2 = RGB, 3 = Palatte Colour, 4 = Transparency Mask, 6 = YCbCr",
                'Type' => "Lookup",
                2 => "RGB (Red Green Blue)",
                6 => "YCbCr (Luminance, Chroma minus Blue, and Chroma minus Red)" ),

274 => array(   'Name' =>  "Orientation",
                'Description' => "Specifies the orientation of the image.\n
1 = Row 0 top, column 0 left\n
2 = Row 0 top, column 0 right\n
3 = Row 0 bottom, column 0 right\n
4 = Row 0 bottom, column 0 left\n
5 = Row 0 left, column 0 top\n
6 = Row 0 right, column 0 top\n
7 = Row 0 right, column 0 bottom\n
8 = Row 0 left, column 0 bottom",
                'Type' => "Lookup",
                1 => "No Rotation, No Flip \n(Row 0 is at the visual top of the image,\n and column 0 is the visual left-hand side)",
                2 => "No Rotation, Flipped Horizontally \n(Row 0 is at the visual top of the image,\n and column 0 is the visual right-hand side)",
                3 => "Rotated 180 degrees, No Flip \n(Row 0 is at the visual bottom of the image,\n and column 0 is the visual right-hand side)",
                4 => "No Rotation, Flipped Vertically \n(Row 0 is at the visual bottom of the image,\n and column 0 is the visual left-hand side)",
                5 => "Flipped Horizontally, Rotated 90 degrees counter clockwise \n(Row 0 is at the visual left-hand side of of the image,\n and column 0 is the visual top)",
                6 => "No Flip, Rotated 90 degrees clockwise \n(Row 0 is at the visual right-hand side of of the image,\n and column 0 is the visual top)",
                7 => "Flipped Horizontally, Rotated 90 degrees clockwise \n(Row 0 is at the visual right-hand side of of the image,\n and column 0 is the visual bottom)",
                8 => "No Flip, Rotated 90 degrees counter clockwise \n(Row 0 is at the visual left-hand side of of the image,\n and column 0 is the visual bottom)" ),
277 => array(   'Name' =>  "Samples Per Pixel",
                'Description' => "Number of recorded samples (colours) per pixel - usually 1 for B&W, grayscale, and palette-colour, usually 3 for RGB and YCbCr",
                'Type' => "Numeric",
                'Units' => "Components (colours)" ),

284 => array(   'Name' =>  "Planar Configuration",
                'Description' => "Specifies whether pixel components are recorded in chunky or planar format - 1 = Chunky, 2 = Planar",
                'Type' => "Lookup",
                1 => "Chunky Format",
                2 => "Planar Format" ),

530 => array(   'Name' =>  "YCbCr Sub-Sampling",
                'Description' => "Specifies ratio of chrominance to luminance components - [2, 1] = YCbCr4:2:2,  [2, 2] = YCbCr4:2:0",
                'Type' => "Special" ),


531 => array(   'Name' =>  "YCbCr Positioning",
                'Description' => "Specifies location of chrominance and luminance components - 1 = centered, 2 = co-sited",
                'Type' => "Lookup",
                1 => "Chrominance components Centred in relation to luminance components",
                2 => "Chrominance and luminance components Co-Sited" ),


282 => array(   'Name' =>  "X Resolution",
                'Description' => "Number of columns (pixels) per \'ResolutionUnit\'",
                'Type' => "Numeric",
                'Units'=> "pixels per 'Resolution Unit' " ),

283 => array(   'Name' =>  "Y Resolution",
                'Description' => "Number of rows (pixels) per \'ResolutionUnit\'",
                'Type' => "Numeric",
                'Units'=> "pixels per 'Resolution Unit' " ),

296 => array(   'Name' =>  "Resolution Unit",
                'Description' => "Units for measuring XResolution and YResolution - 1 = No units, 2 = Inches, 3 = Centimetres",
                'Type' => "Lookup",
                2 => "Inches",
                3 => "Centimetres" ),

273 => array(   'Name' =>  "Strip Offsets",
                'Type' => "Numeric",
                'Units'=> "bytes offset" ),

278 => array(   'Name' =>  "Rows Per Strip",
                'Type' => "Numeric",
                'Units'=> "rows" ),

279 => array(   'Name' => "Strip Byte Counts",
                'Type' => "Numeric",
                'Units'=> "bytes" ),

513 => array(   'Name' => "Exif Thumbnail (JPEG Interchange Format)",
                'Type' => "Special" ),

514 => array(   'Name' => "Exif Thumbnail Length (JPEG Interchange Format Length)",
                'Type' => "Numeric",
                'Units'=> "bytes" ),

301 => array(   'Name' => "Transfer Function",
                'Type' => "Numeric",
                'Units'=> "" ),

318 => array(   'Name' => "White Point Chromaticity",
                'Type' => "Numeric",
                'Units'=> "(x,y coordinates on a 1931 CIE xy chromaticity diagram)" ),

319 => array(   'Name' => "Primary Chromaticities",
                'Type' => "Numeric",
                'Units'=> "(Red x,y, Green x,y, Blue x,y coordinates on a 1931 CIE xy chromaticity diagram)" ),

529 => array(   'Name' => "YCbCr Coefficients",
                'Description' => "Transform Coefficients for transformation from RGB to YCbCr",
                'Type' => "Numeric",
                'Units'=> "(LumaRed, LumaGreen, LumaBlue [proportions of red, green, and blue in luminance])" ),

532 => array(   'Name' => "Reference Black point and White point",
                'Type' => "Numeric",
                'Units'=> "(R or Y White Headroom, R or Y Black Footroom, G or Cb White Headroom, G or Cb Black Footroom, B or Cr White Headroom, B or Cr Black Footroom)" ),

306 => array(   'Name' => "Date and Time",
                'Type' => "Numeric",
                'Units'=> " (Format: YYYY:MM:DD HH:mm:SS)" ),

270 => array(   'Name' => "Image Description",
                'Type' => "String" ),

271 => array(   'Name' => "Make (Manufacturer)",
                'Type' => "String" ),

272 => array(   'Name' => "Model",
                'Type' => "String" ),

305 => array(   'Name' => "Software or Firmware",
                'Type' => "String" ),

315 => array(   'Name' => "Artist Name",
                'Type' => "String" ),

700 => array(   'Name' => "Embedded XMP Block",        // Change: Added embedded XMP as of version 1.11
                'Type' => "XMP" ),

33432 => array( 'Name' => "Copyright Information",
                'Type' => "String" ),

34665 => array( 'Name' => "EXIF Image File Directory (IFD)",
                'Type' => "SubIFD",
                'Tags Name' => "EXIF" ),

33723 => array( 'Name' => "IPTC Records",
                'Type' => "IPTC" ),

34377 => array( 'Name' => "Embedded Photoshop IRB",    // Change: Added embedded IRB as of version 1.11
                'Type' => "IRB" ),

34853 => array( 'Name' => "GPS Info Image File Directory (IFD)",        // Change: Moved GPS IFD tag to correct location as of version 1.11
                'Type' => "SubIFD",
                'Tags Name' => "GPS" ),

50341 => array( 'Name' => "Print Image Matching Info",
                'Type' => "PIM" ),

),


/*****************************************************************************/
/*                                                                           */
/* EXIF Tags                                                                 */
/*                                                                           */
/*****************************************************************************/


'EXIF' => array (

// Exif IFD
36864 => array( 'Name' => "Exif Version",
                'Type' => "String" ),

40965 => array( 'Name' => "Interoperability Image File Directory (IFD)",
                'Type' => "SubIFD",
                'Tags Name' => "Interoperability" ),

// Change: removed GPS IFD tag from here as it was incorrect location - as of version 1.11

40960 => array( 'Name' => "FlashPix Version",
                'Type' => "String" ),

40961 => array( 'Name' => "Colour Space",
                'Type' => "Lookup",
                1 => "sRGB",
                0xFFFF => "Uncalibrated" ),

40962 => array( 'Name' => "Pixel X Dimension",
                'Type' => "Numeric",
                'Units'=> "pixels" ),

40963 => array( 'Name' => "Pixel Y Dimension",
                'Type' => "Numeric",
                'Units' => "pixels" ),

37121 => array( 'Name' => "Components Configuration",
                'Type' => "Special" ),

37122 => array( 'Name' => "Compressed Bits Per Pixel",
                'Type' => "Numeric",
                'Units' => "bits" ),

37500 => array( 'Name' => "Maker Note",
                'Type' => "Maker Note" ),

37510 => array( 'Name' => "User Comment",
                'Type' => "Character Coded String" ),

40964 => array( 'Name' => "Related Sound File",
                'Type' => "String" ),

36867 => array( 'Name' => "Date and Time of Original",
                'Type' => "String",
                'Units' => " (Format: YYYY:MM:DD HH:mm:SS)" ),