GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  TIFFGETFIELD (3)

NAME

TIFFGetField, TIFFVGetField - get the value(s) of a tag in an open TIFF file

CONTENTS

Synopsis
Description
Autoregistered Tags
Return Values
Diagnostics

SYNOPSIS

#include <tiffio.h>

int TIFFGetField(TIFF *tif, ttag_t tag, ...)

#include <stdarg.h>

int TIFFVGetField(TIFF *tif, ttag_t tag, va_list ap)
int TIFFGetFieldDefaulted(TIFF *tif, ttag_t tag, ...)
int TIFFVGetFieldDefaulted(TIFF *tif, ttag_t tag, va_list ap)

DESCRIPTION

TIFFGetField returns the value of a tag or pseudo-tag associated with the the current directory of the opened TIFF file tif. (A pseudo-tag is a parameter that is used to control the operation of the TIFF library but whose value is not read or written to the underlying file.) The file must have been previously opened with TIFFOpen(3TIFF). The tag is identified by tag, one of the values defined in the include file tiff.h (see also the table below). The type and number of values returned is dependent on the tag being requested. The programming interface uses a variable argument list as prescribed by the stdarg(3) interface. The returned values should only be interpreted if TIFFGetField returns 1.

TIFFVGetField is functionally equivalent to TIFFGetField except that it takes a pointer to a variable argument list. TIFFVGetField is useful for layering interfaces on top of the functionality provided by TIFFGetField.

TIFFGetFieldDefaulted and TIFFVGetFieldDefaulted are identical to TIFFGetField and TIFFVGetField, except that if a tag is not defined in the current directory and it has a default value, then the default value is returned.

The tags understood by libtiff(3TIFF), the number of parameter values, and the types for the returned values are shown below. The data types are specified as in C and correspond to the types used to specify tag values to TIFFSetField(3TIFF). Remember that TIFFGetField returns parameter values, so all the listed data types are pointers to storage where values should be returned. Consult the TIFF specification (or relevant industry specification) for information on the meaning of each tag and their possible values.


Tag Name                      Count                TypesNotes

TIFFTAG_ARTIST                1    char** TIFFTAG_BADFAXLINES           1    uint32* TIFFTAG_BITSPERSAMPLE         1    uint16* TIFFTAG_CLEANFAXDATA          1    uint16* TIFFTAG_COLORMAP              3    uint16**        1<<BitsPerSample arrays TIFFTAG_COMPRESSION           1    uint16* TIFFTAG_CONSECUTIVEBADFAXLINES     1               uint32* TIFFTAG_COPYRIGHT             1    char** TIFFTAG_DATATYPE              1    uint16* TIFFTAG_DATETIME              1    char** TIFFTAG_DOCUMENTNAME          1    char** TIFFTAG_DOTRANGE              2    uint16* TIFFTAG_EXTRASAMPLES          2    uint16*,uint16**count & types array TIFFTAG_FAXFILLFUNC           1    TIFFFaxFillFunc*G3/G4 compression pseudo-tag TIFFTAG_FAXMODE               1    int*            G3/G4 compression pseudo-tag TIFFTAG_FILLORDER             1    uint16* TIFFTAG_GROUP3OPTIONS         1    uint32* TIFFTAG_GROUP4OPTIONS         1    uint32* TIFFTAG_HALFTONEHINTS         2    uint16* TIFFTAG_HOSTCOMPUTER          1    char** TIFFTAG_ICCPROFILE            2    uint32*,void**  count, profile data TIFFTAG_IMAGEDEPTH            1    uint32* TIFFTAG_IMAGEDESCRIPTION      1    char** TIFFTAG_IMAGELENGTH           1    uint32* TIFFTAG_IMAGEWIDTH            1    uint32* TIFFTAG_INKNAMES              1    char** TIFFTAG_INKSET                1    uint16* TIFFTAG_JPEGCOLORMODE         1    int*            JPEG pseudo-tag TIFFTAG_JPEGQUALITY           1    int*            JPEG pseudo-tag TIFFTAG_JPEGTABLES            2    uint32*,void**  count & tables TIFFTAG_JPEGTABLESMODE        1    int*            JPEG pseudo-tag TIFFTAG_MAKE                  1    char** TIFFTAG_MATTEING              1    uint16* TIFFTAG_MAXSAMPLEVALUE        1    uint16* TIFFTAG_MINSAMPLEVALUE        1    uint16* TIFFTAG_MODEL                 1    char** TIFFTAG_ORIENTATION           1    uint16* TIFFTAG_PAGENAME              1    char** TIFFTAG_PAGENUMBER            2    uint16* TIFFTAG_PHOTOMETRIC           1    uint16* TIFFTAG_PHOTOSHOP             2    uint32*,void**  count, data TIFFTAG_PLANARCONFIG          1    uint16* TIFFTAG_PREDICTOR             1    uint16* TIFFTAG_PRIMARYCHROMATICITIES 1    float**         6-entry array TIFFTAG_REFERENCEBLACKWHITE   1    float**         6-entry array TIFFTAG_RESOLUTIONUNIT        1    uint16* TIFFTAG_RICHTIFFIPTC          2    uint32*,void**  count, data TIFFTAG_ROWSPERSTRIP          1    uint32* TIFFTAG_SAMPLEFORMAT          1    uint16* TIFFTAG_SAMPLESPERPIXEL       1    uint16* TIFFTAG_SMAXSAMPLEVALUE       1    double* TIFFTAG_SMINSAMPLEVALUE       1    double* TIFFTAG_SOFTWARE              1    char** TIFFTAG_STONITS               1    double** TIFFTAG_STRIPBYTECOUNTS       1    uint32** TIFFTAG_STRIPOFFSETS          1    uint32** TIFFTAG_SUBFILETYPE           1    uint32* TIFFTAG_SUBIFD                2    uint16*,uint32**count & offsets array TIFFTAG_TARGETPRINTER         1    char** TIFFTAG_THRESHHOLDING         1    uint16* TIFFTAG_TILEBYTECOUNTS        1    uint32** TIFFTAG_TILEDEPTH             1    uint32* TIFFTAG_TILELENGTH            1    uint32* TIFFTAG_TILEOFFSETS           1    uint32** TIFFTAG_TILEWIDTH             1    uint32* TIFFTAG_TRANSFERFUNCTION      1 or 3†              uint16**1<<BitsPerSample entry arrays TIFFTAG_WHITEPOINT            1    float**         2-entry array TIFFTAG_XMLPACKET             2    uint32*,void**  count, data TIFFTAG_XPOSITION             1    float* TIFFTAG_XRESOLUTION           1    float* TIFFTAG_YCBCRCOEFFICIENTS     1    float**         3-entry array TIFFTAG_YCBCRPOSITIONING      1    uint16* TIFFTAG_YCBCRSUBSAMPLING      2    uint16* TIFFTAG_YPOSITION             1    float* TIFFTAG_YRESOLUTION           1    float*‡

† If SamplesPerPixel is one, then a single array is returned; otherwise three arrays are returned. ‡ The contents of this field are quite complex. See The ICC Profile Format Specification, Annex B.3 "Embedding ICC Profiles in TIFF Files" (available at http://www.color.org) for an explanation.

AUTOREGISTERED TAGS

If you can’t find the tag in the table above that means this is an unsupported tag and is not directly supported by libtiff(3TIFF) library. You will still be able to read it’s value if you know the data type of that tag. For example, if you want to read the LONG value from the tag 33424 and ASCII string from the tag 36867 you can use the following code:

uint32  count;
void    *data;

TIFFGetField(tiff, 33424, &count, &data); printf("Tag %d: %d, count %d0, 33424, *(uint32 *)data, count); TIFFGetField(tiff, 36867, &count, &data); printf("Tag %d: %s, count %d0, 36867, (char *)data, count);

RETURN VALUES

1 is returned if the tag is defined in the current directory; otherwise a 0 is returned.

DIAGNOSTICS

All error messages are directed to the TIFFError(3TIFF) routine.

Unknown field, tag 0x%x. An unknown tag was supplied.

SEE ALSO

TIFFOpen(3TIFF), TIFFSetField(3TIFF), TIFFSetDirectory(3TIFF), TIFFReadDirectory(3TIFF), TIFFWriteDirectory(3TIFF) libtiff(3TIFF),

Libtiff library home page: http://www.remotesensing.org/libtiff/

Search for    or go to Top of page |  Section 3 |  Main Index


libtiff TIFFGETFIELD (3TIFF) March 18, 2005

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.