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diff --git a/html/internals.html b/html/internals.html index 756b5ab0..70ec7f20 100644 --- a/html/internals.html +++ b/html/internals.html @@ -11,20 +11,6 @@ Modifying The TIFF Library </H1> -<H5> -This documentation is best viewed using a graphical browser that supports -the latest HTML directives for formatting documents. In particular, -this document was authored -for viewing with version 1.1 or newer of the -<A HREF="http://home.mcom.com/comprod/products/navigator/index.html">Netscape Navigator</A>. -</H5> - -<BR CLEAR=left> - -<PRE> - -</PRE> - <P> This chapter provides information about the internal structure of the library, how to control the configuration when building it, and @@ -67,11 +53,17 @@ Configuration defines are split into three areas: <P> If the define <TT>COMPRESSION_SUPPORT</TT> is <STRONG>not defined</STRONG> then a default set of compression schemes is automatically -configured: CCITT Group 3 and 4 algorithms (compression codes 2, 3, 4, -and 32771), the Macintosh PackBits algorithm (compression 32773), -a Lempel-Ziv & Welch (LZW) algorithm (compression 5), a 4-bit -run-length encoding scheme from ThunderScan (compression 32809), -and a 2-bit encoding scheme used by NeXT (compression 32766). +configured: +<UL> +<LI>CCITT Group 3 and 4 algorithms (compression codes 2, 3, 4, and 32771), +<LI>the Macintosh PackBits algorithm (compression 32773), +<LI>a Lempel-Ziv & Welch (LZW) algorithm (compression 5), +<LI>a 4-bit run-length encoding scheme from ThunderScan (compression 32809), +<LI>a 2-bit encoding scheme used by NeXT (compression 32766), and +<LI>two experimental schemes intended for images with high dynamic range +(compression 34676 and 34677). +</UL> + To override this behaviour define <TT>COMPRESSION_SUPPORT</TT> and then one or more additional defines to enable configuration of the appropriate codecs (see the table below); e.g. @@ -185,6 +177,11 @@ run-length encoding scheme from ThunderScan (compression 32809)</TD> </TR> <TR> +<TD VALIGN=top><TT>SGILOG_SUPPORT</TT></TD> +<TD>SGI's compression scheme for high-resolution color images (compression 34676 and 34677)</TD> +</TR> + +<TR> <TD VALIGN=top><TT>COLORIMETRY_SUPPORT</TT></TD> <TD>support for the TIFF 6.0 colorimetry tags</TD> </TR> @@ -453,7 +450,8 @@ their type is presumed. <P><HR WIDTH=65% ALIGN=right><H3>General Comments</H3></A> -The library is designed to hide as much of the details of TIFF as +The library is designed to hide as much of the details of TIFF from +applications as possible. In particular, TIFF directories are read in their entirety into an internal format. Only the tags known by the library are available to a user and certain tag data may be maintained that a user @@ -471,7 +469,8 @@ the following guidelines to add support to the ``core library''. <OL> <LI>Define the tag in <B>tiff.h</B>. <LI>Add a field to the directory structure in <B>tif_dir.h</B> - and define a <TT>FIELD_*</TT> bit. + and define a <TT>FIELD_*</TT> bit (also update the definition of + <TT>FIELD_CODEC</TT> to reflect your addition). <LI>Add an entry in the <TT>TIFFFieldInfo</TT> array defined at the top of <B>tif_dirinfo.c</B>. Note that you must keep this array sorted by tag @@ -649,7 +648,7 @@ the portability of your TIFF files. <ADDRESS> <A HREF="sam.html">Sam Leffler</A> / <A HREF="mailto:sam@engr.sgi.com">sam@engr.sgi.com</A>. -Last updated: $Date: 1996/12/13 05:31:06 $ +Last updated: $Date: 1997/08/27 23:34:39 $ </ADDRESS> </BODY> |