--- ray/src/px/ra_tiff.c	2005/03/22 04:51:56	2.29
+++ ray/src/px/ra_tiff.c	2005/08/19 02:31:32	2.32
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: ra_tiff.c,v 2.29 2005/03/22 04:51:56 greg Exp $";
+static const char	RCSid[] = "$Id: ra_tiff.c,v 2.32 2005/08/19 02:31:32 greg Exp $";
 #endif
 /*
  *  Program to convert between RADIANCE and TIFF files.
@@ -362,7 +362,7 @@ initfromtif(void)		/* initialize conversion from TIFF 
 		quiterr("unknown input image resolution");
 
 	if (!TIFFGetField(cvts.tif, TIFFTAG_STONITS, &cvts.stonits))
-		cvts.stonits = 1.;
+		cvts.stonits = -1.;
 
 	if (!TIFFGetField(cvts.tif, TIFFTAG_DATETIME, &cp))
 		cvts.capdate[0] = '\0';
@@ -380,13 +380,15 @@ initfromtif(void)		/* initialize conversion from TIFF 
 	if (cvts.pixrat < .99 || cvts.pixrat > 1.01)
 		fputaspect(cvts.pixrat, cvts.rfp);
 	if (CHK(C_XYZE)) {
-		fputexpos(pow(2.,(double)cvts.bradj)/cvts.stonits, cvts.rfp);
+		if (cvts.stonits > .0)
+			fputexpos(pow(2.,(double)cvts.bradj)/cvts.stonits, cvts.rfp);
 		fputformat(CIEFMT, cvts.rfp);
 	} else {
 		if (CHK(C_PRIM))
 			fputprims(cvts.prims, cvts.rfp);
-		fputexpos(WHTEFFICACY*pow(2.,(double)cvts.bradj)/cvts.stonits,
-				cvts.rfp);
+		if (cvts.stonits > .0)
+			fputexpos(WHTEFFICACY*pow(2.,(double)cvts.bradj)/cvts.stonits,
+					cvts.rfp);
 		fputformat(COLRFMT, cvts.rfp);
 	}
 	if (cvts.capdate[0])
@@ -656,6 +658,9 @@ Luv2Color(			/* read/convert/write Luv->COLOR scanline
 	if (CHK(C_RFLT|C_TWRD|C_TFLT|C_GRY) != (C_RFLT|C_TFLT))
 		quiterr("internal error 1 in Luv2Color");
 
+	if (cvts.pconf != PLANARCONFIG_CONTIG)
+		quiterr("cannot handle separate 32-bit color planes");
+
 	if (TIFFReadScanline(cvts.tif, cvts.t.p, y, 0) < 0)
 		quiterr("error reading TIFF input");
 					/* also works for float RGB */
@@ -694,6 +699,9 @@ RRGGBB2Color(			/* read/convert/write RGB16->COLOR sca
 	if (CHK(C_RFLT|C_TWRD|C_TFLT|C_GRY) != (C_TWRD|C_RFLT))
 		quiterr("internal error 1 in RRGGBB2Color");
 
+	if (cvts.pconf != PLANARCONFIG_CONTIG)
+		quiterr("cannot handle separate 16-bit color planes");
+
 	if (TIFFReadScanline(cvts.tif, cvts.t.p, y, 0) < 0)
 		quiterr("error reading TIFF input");
 	
@@ -973,7 +981,7 @@ Color2RRGGBB(			/* read/convert/write COLOR->RGB16 sca
 			colortrans(cvts.r.colors[x], cvts.cmat,
 					cvts.r.colors[x]);
 		if (CHK(C_GAMUT))
-			clipgamut(cvts.r.colors[x], cvts.t.fp[3*x + 1],
+			clipgamut(cvts.r.colors[x], bright(cvts.r.colors[x]),
 					CGAMUT_LOWER, cblack, cwhite);
 	    }
 	    for (i = 3; i--; ) {