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December 2009
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2009.12.28 19:46 "Re: bug in tiff2pdf, when handling Lab images", by Manlio Perillo
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Sergius Bobrovsky ha scritto: > Hello, > > recently, I've faced this problem too. > trying to fix this bug i found that tiff2pdf just do not write > /BlackPoint before second array. > 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] >>> ] > No, this is wrong. Try to open the resulting document with Acrobat Reader! The BlackPoint can not be the same as WhitePoint. As far as I understand, Acrobat reader use the value of BlackPoint for gamut mapping. Other viewers (like KPDF) don't do gamut mapping, so the image rendering is the same. > [...] Regards Manlio -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAks5CwkACgkQscQJ24LbaUSHzQCfQAZFa9BtKIps11pLQeCPkv+M xv8Ani1aKf8zJScywAHlCHNqK8c4bbed =hVO9 -----END PGP SIGNATURE-----