.\" $Id: TIFFcodec.3tiff,v 1.2 2005/11/02 11:07:18 dron Exp $

.\"

.\" Copyright (c) 1995 Sam Leffler

.\" Copyright (c) 1995 Silicon Graphics, Inc.

.\"

.\" Permission to use, copy, modify, distribute, and sell this software and 

.\" its documentation for any purpose is hereby granted without fee, provided

.\" that (i) the above copyright notices and this permission notice appear in

.\" all copies of the software and related documentation, and (ii) the names of

.\" Sam Leffler and Silicon Graphics may not be used in any advertising or

.\" publicity relating to the software without the specific, prior written

.\" permission of Sam Leffler and Silicon Graphics.

.\" 

.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 

.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 

.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  

.\" 

.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR

.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,

.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,

.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 

.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 

.\" OF THIS SOFTWARE.

.\"

.if n .po 0

.TH CODEC 3TIFF "October 29, 2004" "libtiff"

.SH NAME

TIFFFindCODEC, TIFFRegisterCODEC, TIFFUnRegisterCODEC, TIFFIsCODECConfigured

\- codec-related utility routines

.SH SYNOPSIS

.B "#include <tiffio.h>"

.sp

.BI "const TIFFCodec* TIFFFindCODEC(uint16 " scheme ");"

.br

.BI "TIFFCodec* TIFFRegisterCODEC(uint16 " scheme ", const char *" method ", TIFFInitMethod " init ");"

.br

.BI "void TIFFUnRegisterCODEC(TIFFCodec *" codec ");"

.br

.BI "int TIFFIsCODECConfigured(uint16 " scheme ");"

.SH DESCRIPTION

.I libtiff

supports a variety of compression schemes implemented by software

.IR codecs .

Each codec adheres to a modular interface that provides for

the decoding and encoding of image data; as well as some other

methods for initialization, setup, cleanup, and the control

of default strip and tile sizes.

Codecs are identified by the associated value of the 

.SM TIFF

.I Compression

tag; e.g. 5 for

.SM LZW

compression.

.PP

The

.I TIFFRegisterCODEC

routine can be used to

augment or override the set of codecs available to an application.

If the specified

.I scheme

already has a registered codec then it is

.I overridden

and any images with data encoded with this

compression scheme will be decoded using the supplied coded.

.PP

.I TIFFIsCODECConfigured

returns 1 if the codec is configured and working. Otherwise 0 will be returned.

.SH DIAGNOSTICS

.BR "No space to register compression scheme %s" .

.I TIFFRegisterCODEC

was unable to allocate memory for the data structures needed

to register a codec.

.PP

.BR "Cannot remove compression scheme %s; not registered" .

.I TIFFUnRegisterCODEC

did not locate the specified codec in the table of registered 

compression schemes.

.SH "SEE ALSO"

.BR libtiff (3TIFF)

.PP

Libtiff library home page:

.BR http://www.remotesensing.org/libtiff/