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Set the appropriate ReferenceBlackWhite array for YCbCr image which lacks that

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tag (noted by Hans Petter Selasky).
This commit is contained in:
Andrey Kiselev 2004-11-10 21:08:11 +00:00
parent 361d0c4e33
commit 89cf48606e
1 changed files with 21 additions and 4 deletions
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25
libtiff/tif_aux.c
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@ -1,4 +1,4 @@
/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_aux.c,v 1.7 2004-10-02 13:29:41 dron Exp $ */ /* $Id: tif_aux.c,v 1.8 2004-11-10 21:08:11 dron Exp $ */
/* /*
* Copyright (c) 1991-1997 Sam Leffler * Copyright (c) 1991-1997 Sam Leffler
@ -81,9 +81,24 @@ TIFFDefaultRefBlackWhite(TIFFDirectory* td)
if (!(td->td_refblackwhite = (float *)_TIFFmalloc(6*sizeof (float)))) if (!(td->td_refblackwhite = (float *)_TIFFmalloc(6*sizeof (float))))
return 0; return 0;
for (i = 0; i < 3; i++) { if (td->td_photometric == PHOTOMETRIC_YCBCR) {
td->td_refblackwhite[2*i+0] = 0; /*
td->td_refblackwhite[2*i+1] = (float)((1L<<td->td_bitspersample)-1L); * YCbCr (Class Y) images must have the ReferenceBlackWhite
* tag set. Fix the broken images, which lacks that tag.
*/
td->td_refblackwhite[0] = 0.0F;
td->td_refblackwhite[1] = td->td_refblackwhite[3] =
td->td_refblackwhite[5] = 255.0F;
td->td_refblackwhite[2] = td->td_refblackwhite[4] = 128.0F;
} else {
/*
* Assume RGB (Class R)
*/
for (i = 0; i < 3; i++) {
td->td_refblackwhite[2*i+0] = 0;
td->td_refblackwhite[2*i+1] =
(float)((1L<<td->td_bitspersample)-1L);
}
} }
return 1; return 1;
} }
@ -246,3 +261,5 @@ TIFFGetFieldDefaulted(TIFF* tif, ttag_t tag, ...)
va_end(ap); va_end(ap);
return (ok); return (ok);
} }
/* vim: set ts=8 sts=8 sw=8 noet: */