LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
December 2009
Previous Thread
Next Thread
Previous by Thread
Next by Thread
Previous by Date
Next by Date
Contact
The TIFF Mailing List Homepage
This list is run by Frank Warmerdam
Archive maintained by AWare Systems
Thread
2009.12.28 18:55 "Re: bug in tiff2pdf, when handling Lab images", by Sergius Bobrovsky
> How can the white and black points be the same? I'm not sure. But it's the result of [different] calculations in tiff2pdf code. Also, Acrobat accepts it (see attached file). In any case, a pdf dictionary allowed to contain only Name - Value pairs. So, /WhitePoint name followed by two [0.9643 1.0000 0.8251] values is simply incorrect in terms of pdf syntax. > >> in other words, correct dictionary should be something as following: >> /ColorSpace [/Lab << >> /WhitePoint [0.9643 1.0000 0.8251] >> /BlackPoint [0.9643 1.0000 0.8251] >> /Range [-127 127 -127 127] >>>> >>>> ] >> >> it can be achieved by simply adding >> written += t2pWriteFile(output, (tdata_t)"/BlackPoint ", 12); >> before >> X_W = 0.3457F; /* 0.3127F; */ /* D50, commented D65 */ >> >> >> >> On Mon, Dec 28, 2009 at 10:28 PM, Manlio Perillo >> <manlio.perillo@gmail.com> wrote: >>> >>> -----BEGIN PGP SIGNED MESSAGE----- >>> Hash: SHA1 >>> >>> Hi. >>> >>> >>> I have found a bug in tiff2pdf, when embedding a TIFF images having a >>> Lab color space. >>> >>> I'm reporting the bug here, since on the libtiff web site >>> (http://www.libtiff.org/bugs.html), the link to the bug traker is broken: >>> http://bugzilla.remotesensing.org/buglist.cgi?product=libtiff >>> >>> By the way, the link to this mailing list is broken, too. >>> >>> >>> The problem is with tiff2pdf writing two times the WhitePoint entry in >>> the Lab dictionary: >>> >>> /ColorSpace [/Lab << >>> /WhitePoint [0.9643 1.0000 0.8251] >>> [0.9643 1.0000 0.8251] >>> /Range [-127 127 -127 127] >>>>> >>>>> ] >>> >>> >>> >>> Regards Manlio Perillo >>> -----BEGIN PGP SIGNATURE----- >>> Version: GnuPG v1.4.10 (GNU/Linux) >>> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org >>> >>> iEYEARECAAYFAks43MgACgkQscQJ24LbaUSGBQCfRx/KllvGYAugYS8Y+B6It6oH >>> 3KsAn07uuSp+2clGShZ+UaKq67ng5inw >>> =vMdm >>> -----END PGP SIGNATURE----- >>> _______________________________________________ >>> Tiff mailing list: Tiff@lists.maptools.org >>> http://lists.maptools.org/mailman/listinfo/tiff >>> http://www.remotesensing.org/libtiff/ >>> >> >> >> >> -- >> Sergius Bobrovsky >> _______________________________________________ >> Tiff mailing list: Tiff@lists.maptools.org >> http://lists.maptools.org/mailman/listinfo/tiff >> http://www.remotesensing.org/libtiff/ > > -- Sergius Bobrovsky