imported contrast module

Lib/Makefile

@@ -38,6 +38,7 @@ combine3.o:	combine3.c	$(DEPS)
 combine4.o:	combine4.c	$(DEPS)
 combine5.o:	combine5.c	$(DEPS)
 combine6.o:	combine6.c	$(DEPS)
+contrast.o:	contrast.c	$(DEPS)
 
 detect.o:	detect.c	$(DEPS)
 distances.o:	distances.c	$(DEPS)
@@ -130,6 +131,7 @@ OBJECTS =	7seg.o							\
 		calculs.o classif.o 					\
 		col4bits.o colors.o colors2.o col_reduc.o col_xyz.o	\
 		combine.o combine2.o combine3.o combine4.o combine5.o 	\
+		contrast.o						\
 		detect.o distances.o					\
 		dither.o dither2.o dither3.o dither4.o			\
 		doublesz.o drawalpha.o drawing.o drawpatt.o		\

Lib/contrast.c

@@ -4,7 +4,7 @@
 
 #include  <stdio.h>
 #include  <math.h>
-#include  "tthimage.h"
+#include  "../tthimage.h"
 
 /*::------------------------------------------------------------------::*/
 /*