diff --git a/.gitignore b/.gitignore
index 3443c8c..ccdc97c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -51,3 +51,5 @@ tools/addpnm2fimg
 tools/cumulfimgs
 tools/fimgops
 tools/fimgfx
+tools/*.png
+
diff --git a/floatimg.h b/floatimg.h
index 3fd36b6..91ed52f 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -2,7 +2,7 @@
  *	floatimg.h
  */
 
-#define		FIMG_VERSION	96
+#define		FIMG_VERSION	97
 
 /*
  *	in memory descriptor
diff --git a/funcs/Makefile b/funcs/Makefile
index b7ccb0e..a849b0c 100644
--- a/funcs/Makefile
+++ b/funcs/Makefile
@@ -34,7 +34,7 @@ geometry.o:		geometry.c $(DEPS)
 	gcc $(COPT) -c $<
 
 rotate.o:		rotate.c $(DEPS)
-	gcc $(COPT) -DDEBUG_LEVEL=1 -c $<
+	gcc $(COPT) -c $<
 
 sfx0.o:			sfx0.c $(DEPS)
 	gcc $(COPT) -c $<
diff --git a/tools/essai.sh b/tools/essai.sh
new file mode 100755
index 0000000..4364f27
--- /dev/null
+++ b/tools/essai.sh
@@ -0,0 +1,23 @@
+#!/bin/bash
+
+#
+#	essai des differents outils
+#
+
+#  -----------------------------------------------------
+
+TMPF="tmp.fimg"
+
+#  -----------------------------------------------------
+function essai_rot90
+{
+echo "=== " $0 " ==="
+./mkfimg -v -t hdeg $TMPF 800 600
+./fimg2png -v $TMPF foo.png
+./fimgfx -v rot90 $TMPF bar.fimg
+}
+#  -----------------------------------------------------
+
+essai_rot90
+
+#  -----------------------------------------------------
diff --git a/tools/fimgfx.c b/tools/fimgfx.c
index bd55c40..5ad9170 100644
--- a/tools/fimgfx.c
+++ b/tools/fimgfx.c
@@ -17,24 +17,27 @@ typedef struct {
 	char		*name;
 	int		id;
 	int		nbarg;
+	int		flags;
 	} Fx;
 
 enum fxid { Fx_cos01=5, Fx_cos010, Fx_pow2, Fx_sqrt, Fx_gray0, Fx_halfsz0,
+		Fx_rot90,
 		Fx_xper };
 
 Fx fx_list[] = {
-	{ "cos01",		Fx_cos01,	0 },
-	{ "cos010",		Fx_cos010,	0 },
-	{ "pow2",		Fx_pow2,	0 },
-	{ "sqrt",		Fx_sqrt,	0 },
-	{ "gray0",		Fx_gray0,	0 },
-	{ "halfsz0",		Fx_halfsz0,	0 },
-	{ "xper",		Fx_xper,	0 },
+	{ "cos01",		Fx_cos01,	0,	1 },
+	{ "cos010",		Fx_cos010,	0,	1 },
+	{ "pow2",		Fx_pow2,	0,	1 },
+	{ "sqrt",		Fx_sqrt,	0,	1 },
+	{ "gray0",		Fx_gray0,	0,	1 },
+	{ "halfsz0",		Fx_halfsz0,	0,	1 },
+	{ "rot90",		Fx_rot90,	0,	0 },
+	{ "xper",		Fx_xper,	0,	1 },
 	{ NULL,			0,	0 }
 	};
 
 /* --------------------------------------------------------------------- */
-int lookup_fx(char *txt)
+int lookup_fxidx(char *txt)
 {
 Fx		*fx;
 int		n;
@@ -45,10 +48,10 @@ fprintf(stderr, ">>> %s ( '%s' )\n", __func__, txt);
 
 for (n=0, fx=fx_list; fx->name; fx++, n++) {
 #if DEBUG_LEVEL > 1
-	fprintf(stderr, "-> %3d %s\n", n, fx->name);
+	fprintf(stderr, "  -> %3d %s\n", n, fx->name);
 #endif
 	if (!strcmp(fx->name, txt)) {
-		return fx->id;
+		return n;
 		}
 	}
 return -1;		/* NOT FOUND */
@@ -101,15 +104,15 @@ fimg_print_version(1);
 exit(0);
 }
 /* --------------------------------------------------------------------- */
-int do_an_effect(char *sf, int act, char *df)
+int do_an_effect(char *sf, int fxidx, char *df)
 {
 FloatImg	src, dest;
-int		foo;
+int		foo, action;
 double		maxval;
 
 #if DEBUG_LEVEL
 fprintf(stderr, ">>> %s ( '%s' %d '%s' )\n", __func__,
-			   sf, act, df);
+			   sf, action, df);
 #endif
 
 foo = fimg_create_from_dump(sf, &src);
@@ -120,13 +123,21 @@ if (foo) {
 
 maxval = (double)fimg_get_maxvalue(&src);
 
-foo = fimg_clone(&src, &dest, 0);
-if (foo) {
-	fprintf(stderr, "err clone %p : %d\n", &src, foo);
-	return foo;
+if (fx_list[fxidx].flags & 1) {
+	foo = fimg_clone(&src, &dest, 0);
+	if (foo) {
+		fprintf(stderr, "err clone %p : %d\n", &src, foo);
+		return foo;
+		}
+	}
+else	{
+	/* XXX */
+	memset(&dest, 0, sizeof(dest));
 	}
 
-switch (act) {
+action = fx_list[fxidx].id;
+
+switch (action) {
 	case Fx_cos01:
 		fimg_cos_01(&src, &dest, maxval);		break;
 	case Fx_cos010:
@@ -143,14 +154,16 @@ switch (act) {
 	case Fx_xper:
 		do_experiment(&src, &dest, maxval);		break;
 		
-
+	case Fx_rot90:
+		foo = fimg_rotate_90(&src, &dest, 0);		break;
+		
 	case Fx_halfsz0:
-		fprintf(stderr, "not implemented\n");
+		fprintf(stderr, "halfsize was not implemented\n");
 		return -3;
 
 	default:
 		fprintf(stderr, "%s %s : %d is bad action\n",
-					__FILE__, __func__, act);
+					__FILE__, __func__, action);
 		break;
 
 	}
@@ -193,7 +206,7 @@ if (3 > argc-optind) {
 	}
 
 operator = argv[optind];
-action = lookup_fx(operator);
+action = lookup_fxidx(operator);
 if (action < 0) {
 	fprintf(stderr, "garbage found in opcode field : %s\n", operator);
 	exit(1);