PNG: The Definitive Guide
by Greg Roelofs


This errata page lists errors outstanding in the most recent printing.

If you have technical questions or error reports, you can send them to
booktech@oreilly.com.  Please specify the printing date of your copy.



This page was last modified on November 20, 2001.


Here's a key to the markup:

        [page-number]: serious technical mistake
        {page-number}: minor technical mistake
        <page-number>: important language/formatting problem
        (page-number): language change or minor formatting problem
        ?page-number?: reader question or request for clarification



Confirmed errors:


<xvii>  The URL for the author's web page for the book has 
	changed.  It now reads:
	http://www.cdrom.com/pub/png/pngbook.html
	The new URL is -
	http://www.libpng.org/pub/png/pngbook.html


(89) In the first paragraph after the output listing:  the second
     clause of the second-to-last sentence should read, "the only 
     loss of information it intentionally allows is the explicit 
     removal or replacement of chunks at the user's direction, 
     though a limitation in current versions of the PNG reference 
     library also causes the accidental deletion of unknown, 
     safe-to-copy chunks."


(157) In the first paragraph:  the parenthetical should read, "(This
      problem seems to have been fixed in more recent versions, but 
      even current versions include 160 bytes' worth of text and 
      background chunks per image.)"


(289) Insert "Chapter 5" heading and new reference:
       
	libtiff home page
       	Welles, Mike, http://www.libtiff.org/. 

Sam Leffler's original libtiff repository is still available at
       
	ftp://ftp.sgi.com/graphics/tiff/

but he no longer maintains the library. 


(289) Insert "Chapter 6" heading and new reference: 

	VRML97, ISO/IEC 14772-1:1997  
       	http://www.vrml.org/Specifications/VRML97/ 


(290) At the end of the "Chapter 8" section, add to the paragraph:
      See also the Chapter 5 entry for the libtiff home page.


(Index) There are changes to the index. The new index is available
        at: http://www.oreilly.com/catalog/pngdefg/inx.html


(324) A line should be added to the colophon:

	The color insert was designed by Alicia Cech.