--- ray/src/common/color.h	1990/12/14 12:48:30	1.7
+++ ray/src/common/color.h	1991/03/18 09:32:49	1.9
@@ -48,6 +48,8 @@ typedef float  COLOR[3];	/* red, green, blue */
 #define  normbright(c)		(int)((67L*(c)[RED]+168L*(c)[GRN]+21L*(c)[BLU])/256)
 #endif
 
+#define  luminance(col)		(683.0 * bright(col))
+
 #define  intens(col)		( (col)[0] > (col)[1] \
 				? (col)[0] > (col)[2] ? (col)[0] : (col)[2] \
 				: (col)[1] > (col)[2] ? (col)[1] : (col)[2] )
@@ -79,5 +81,14 @@ typedef float  COLOR[3];	/* red, green, blue */
 #define  isaspect(hl)		(!strncmp(hl,ASPECTSTR,ASPECTSTRL))
 #define  aspectval(hl)		atof((hl)+ASPECTSTRL)
 #define  fputaspect(pa,fp)	fprintf(fp,"%s%f\n",ASPECTSTR,pa)
+
+				/* macros for color correction */
+#define  COLCORSTR		"COLORCORR="
+#define  COLCORSTRL		10
+#define  iscolcor(hl)		(!strncmp(hl,COLCORSTR,COLCORSTRL))
+#define  colcorval(cc,hl)	sscanf(hl+COLCORSTRL,"%f %f %f", \
+					&(cc)[RED],&(cc)[GRN],&(cc)[BLU])
+#define  fputcolcor(cc,fp)	fprintf(fp,"%s %f %f %f\n",COLCORSTR, \
+					(cc)[RED],(cc)[GRN],(cc)[BLU])
 
 extern double  ldexp(), atof();