diff --git a/src/floatimg.h b/src/floatimg.h
index de54235..b50f8be 100644
--- a/src/floatimg.h
+++ b/src/floatimg.h
@@ -4,7 +4,7 @@
  *	http://la.buvette.org/photos/cumul
  */
 
-#define		FIMG_VERSION	148
+#define		FIMG_VERSION	150
 
 /*
  *	in memory descriptor
@@ -26,7 +26,7 @@ typedef struct {
  */
 typedef struct {
 	char		magic[8];
-	int		w, h, t;
+	int32_t		w, h, t;
 	} FimgFileHead;
 
 #define MAGIC_AREA51	0xA5EA0051
@@ -95,7 +95,6 @@ int fimg_mul_3(FloatImg *a, FloatImg *b, FloatImg *d);
 int fimg_minimum(FloatImg *a, FloatImg *b, FloatImg *d);
 int fimg_maximum(FloatImg *a, FloatImg *b, FloatImg *d);
 
-
 /*	funcs/filtrage.c		*/
 
 typedef struct {
@@ -124,6 +123,9 @@ int fimg_highlight_color(FloatImg *src, FloatImg *dst,
 int fimg_binarize(FloatImg *pimg, int notused);
 int fimg_trinarize(FloatImg *pimg, int notused);
 
+/*	 module sfx4.c			*/
+int fimg_sfx_triplemul(FloatImg *s, FloatImg *d, int notused);
+
 /*	funcs/rotate.c module		*/
 /*	#coronamaison			*/
 int fimg_rotate_90(FloatImg *src, FloatImg *dst, int notused);
diff --git a/src/funcs/Makefile b/src/funcs/Makefile
index 2a10d24..b836c33 100644
--- a/src/funcs/Makefile
+++ b/src/funcs/Makefile
@@ -15,7 +15,7 @@ COPT = -Wall -fpic -g -no-pie  -DDEBUG_LEVEL=0
 DEPS = ../floatimg.h Makefile
 
 OBJS = fimg-png.o fimg-tiff.o misc-plots.o filtrage.o utils.o	\
-	fimg-libpnm.o rampes.o sfx0.o sfx1.o sfx2.o		\
+	fimg-libpnm.o rampes.o sfx0.o sfx1.o sfx2.o sfx4.o		\
 	geometry.o rotate.o fimg-openexr.o			\
 	equalize.o fimg-fits.o saturation.o histogram.o		\
 	hsv.o classif.o contour2x2.o qsortrgb.o exporter.o	\
@@ -115,6 +115,9 @@ sfx1.o:			sfx1.c $(DEPS)
 sfx2.o:			sfx2.c $(DEPS)
 	gcc $(COPT) -c $<
 
+sfx4.o:			sfx4.c $(DEPS)
+	gcc $(COPT) -c $<
+
 contour2x2.o:		contour2x2.c $(DEPS)
 	gcc $(COPT) -c $<
 
diff --git a/src/funcs/equalize.c b/src/funcs/equalize.c
index 264856a..d95afa1 100644
--- a/src/funcs/equalize.c
+++ b/src/funcs/equalize.c
@@ -6,6 +6,7 @@
 
 #include  <stdio.h>
 #include  <string.h>
+#include  <stdint.h>
 
 #include  "../floatimg.h"
 
diff --git a/src/funcs/plasmas.c b/src/funcs/plasmas.c
index ba4d97a..6c9aed1 100644
--- a/src/funcs/plasmas.c
+++ b/src/funcs/plasmas.c
@@ -7,6 +7,7 @@
 
 #include  <stdio.h>
 #include  <math.h>
+#include  <stdint.h>
 
 #include "../floatimg.h"
 
diff --git a/src/funcs/rampes.c b/src/funcs/rampes.c
index d207972..42f196e 100644
--- a/src/funcs/rampes.c
+++ b/src/funcs/rampes.c
@@ -4,6 +4,7 @@
  */
 
 #include  <stdio.h>
+#include  <stdint.h>
 
 #include  "../floatimg.h"
 
diff --git a/src/funcs/recurse.c b/src/funcs/recurse.c
index 6b17cf1..f0ee498 100644
--- a/src/funcs/recurse.c
+++ b/src/funcs/recurse.c
@@ -5,6 +5,7 @@
 
 #include   <stdio.h>
 #include   <math.h>
+#include  <stdint.h>
 
 #include   "../floatimg.h"
 
@@ -20,6 +21,8 @@ int fimg_recursion_proto(FloatImg *src, FloatImg *dst, int notused)
 fprintf(stderr, ">>> %s ( %p %p %d )\n", __func__, src, dst, notused);
 #endif
 
+fprintf(stderr, "!!!!!! %s is a wip !!!!!\n", __func__);
+
 return -1;
 }
 /* -------------------------------------------------------------------- */
diff --git a/src/funcs/rotate.c b/src/funcs/rotate.c
index 77b4816..2ca1477 100644
--- a/src/funcs/rotate.c
+++ b/src/funcs/rotate.c
@@ -6,6 +6,7 @@
 
 #include  <stdio.h>
 #include  <string.h>
+#include  <stdint.h>
 
 #include  "../floatimg.h"
 
diff --git a/src/funcs/saturation.c b/src/funcs/saturation.c
index 4aac814..8cd9d5c 100644
--- a/src/funcs/saturation.c
+++ b/src/funcs/saturation.c
@@ -3,6 +3,7 @@
  */
 
 #include  <stdio.h>
+#include  <stdint.h>
 
 #include  "../floatimg.h"
 
@@ -99,7 +100,7 @@ coefs[0] = coefs[2] = coefs[4] = minima;
 
 foo = fimg_shift_to_zero(src, dst, coefs);
 if (foo) {
-	fprintf(stderr, "%s WTF?\n", __func__);
+	fprintf(stderr, "%s WTF? %d\n", __func__, foo);
 	return foo;
 	}
 
diff --git a/src/funcs/sfx0.c b/src/funcs/sfx0.c
index 7c46bd0..1de4c65 100644
--- a/src/funcs/sfx0.c
+++ b/src/funcs/sfx0.c
@@ -5,6 +5,7 @@
 
 #include  <stdio.h>
 #include  <string.h>
+#include  <stdint.h>
 
 #include  "../floatimg.h"
 
diff --git a/src/funcs/sfx1.c b/src/funcs/sfx1.c
index c474123..1430668 100644
--- a/src/funcs/sfx1.c
+++ b/src/funcs/sfx1.c
@@ -6,6 +6,7 @@
 
 #include  <stdio.h>
 #include  <string.h>
+#include  <stdint.h>
 
 #include  "../floatimg.h"
 
diff --git a/src/funcs/sfx2.c b/src/funcs/sfx2.c
index b05e2aa..3ca589c 100644
--- a/src/funcs/sfx2.c
+++ b/src/funcs/sfx2.c
@@ -5,6 +5,7 @@
 
 #include  <stdio.h>
 #include  <string.h>
+#include  <stdint.h>
 
 #include  "../floatimg.h"
 
diff --git a/src/funcs/sfx4.c b/src/funcs/sfx4.c
new file mode 100644
index 0000000..13dbfd4
--- /dev/null
+++ b/src/funcs/sfx4.c
@@ -0,0 +1,42 @@
+/*
+ *		FLOATIMG - a kluge from tTh
+ *		---------------------------
+ *
+ *	some strange effects on floating pictures.
+ */
+
+
+#include  <stdio.h>
+#include  <string.h>
+#include  <stdint.h>
+
+#include  "../floatimg.h"
+
+extern int		verbosity;
+
+/* -------------------------------------------------------------- */
+int fimg_sfx_triplemul(FloatImg *src, FloatImg *dst, int notused)
+{
+int		x, y, foo;
+float		in[3], out[3];
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p 0x%04x )\n", __func__, img, notused);
+#endif
+
+for (y=0; y<src->height; y++) {
+	for (x=0; x<src->width; x++) {
+		foo =  fimg_get_rgb(src, x, y, in);
+		out[0] = in[1] * in[2];
+		out[1] = in[0] * in[2];
+		out[2] = in[0] * in[1];
+		// fprintf(stderr, "%9f %9f %9f\n", out[0], out[1], out[2]);
+		foo =  fimg_put_rgb(dst, x, y, out);
+		}
+	}
+
+return 0;
+}
+/* -------------------------------------------------------------- */
+
+/* -------------------------------------------------------------- */
diff --git a/src/funcs/utils.c b/src/funcs/utils.c
index cc8443f..2e3c945 100644
--- a/src/funcs/utils.c
+++ b/src/funcs/utils.c
@@ -4,6 +4,7 @@
 
 #include  <stdio.h>
 #include  <string.h>
+#include  <stdint.h>
 
 #include  "../floatimg.h"
 
diff --git a/src/lib/contrast.c b/src/lib/contrast.c
index 7bc4644..be29806 100644
--- a/src/lib/contrast.c
+++ b/src/lib/contrast.c
@@ -1,5 +1,9 @@
 /*
  *		contrast.c - part of libfloatimg
+ *		--------------------------------
+ *
+ *	you can see some use in 'tools/fimgfx.c', so you can thing
+ *	about the 'maxval' parameter. C'est touchy :)
  */
 
 #include  <stdio.h>
@@ -34,7 +38,7 @@ int		nbre, idx;
 double		dval;
 
 if (s->type != FIMG_TYPE_RGB) {
-	fprintf(stderr, "%s : type %d invalide\n",
+	fprintf(stderr, "%s: type %d invalide\n",
 				__func__, s->type);
 	return -4;
 	}
@@ -42,13 +46,12 @@ if (s->type != FIMG_TYPE_RGB) {
 if (NULL==d) { d = s; }
 else	{
 	if (d->type != FIMG_TYPE_RGB) {
-		fprintf(stderr, "%s : dst type %d invalide\n",
+		fprintf(stderr, "%s: dst type %d invalide\n",
 					__func__, d->type);
 		return -4;
 		}
 	}
 
-
 nbre = s->width * s->height;
 
 for (idx=0; idx<nbre; idx++) {
@@ -83,7 +86,6 @@ else	{
 		}
 	}
 
-
 nbre = s->width * s->height;
 
 for (idx=0; idx<nbre; idx++) {
@@ -97,7 +99,6 @@ for (idx=0; idx<nbre; idx++) {
 
 return 0;
 }
-
 /* ---------------------------------------------------------------- */
 /*
 		#macro Cos_01( X )
@@ -110,7 +111,7 @@ int		nbre, idx;
 double		dval;
 
 if (s->type != FIMG_TYPE_RGB) {
-	fprintf(stderr, "%s : type %d invalide\n",
+	fprintf(stderr, "%s: type %d invalide\n",
 				__func__, s->type);
 	return -4;
 	}
@@ -118,7 +119,7 @@ if (s->type != FIMG_TYPE_RGB) {
 if (NULL==d) { d = s; }
 else	{
 	if (d->type != FIMG_TYPE_RGB) {
-		fprintf(stderr, "%s : dst type %d invalide\n",
+		fprintf(stderr, "%s: dst type %d invalide\n",
 					__func__, d->type);
 		return -4;
 		}
diff --git a/src/tools/fimgfx.c b/src/tools/fimgfx.c
index 16899a4..f8fe055 100644
--- a/src/tools/fimgfx.c
+++ b/src/tools/fimgfx.c
@@ -1,5 +1,8 @@
 /*
 		FIMGFX
+
+ *	some functions here come from 'funcs/contrast.c'
+ *
 */
 #include  <stdio.h>
 #include  <string.h>
@@ -22,7 +25,7 @@ typedef struct {
 
 enum fxid { Fx_cos01=5, Fx_cos010, Fx_pow2, Fx_sqrt, Fx_gray0, Fx_halfsz0,
 		Fx_rot90, Fx_cmixa, Fx_desat, Fx_ctr2x2, Fx_norm,
-		Fx_classtrial, Fx_mirror, Fx_shift0,
+		Fx_classtrial, Fx_mirror, Fx_shift0, Fx_trimul,
 		Fx_xper, Fx_binarize, Fx_trinarize,Fx_hilight_R };
 
 Fx fx_list[] = {
@@ -39,6 +42,7 @@ Fx fx_list[] = {
 	{ "ctr2x2",		Fx_ctr2x2,	0,	1 },
 	{ "mirror",		Fx_mirror,	0,	1 },
 	{ "shift0",		Fx_shift0,	0,	1 },
+	{ "trimul",		Fx_trimul,	0,	1 },
 //	{ "norm",		Fx_norm,	0,	1 },
 	{ "classtrial",		Fx_classtrial,	0,	1 },
 	{ "binarize",		Fx_binarize,	0,	1 },
@@ -51,6 +55,7 @@ Fx fx_list[] = {
 static void list_of_effects(void)
 {
 Fx		*fx;
+/* this list must be on just ONE columns */
 for (fx=fx_list; fx->name; fx++) {
 	printf("%s\n", fx->name);
 	}
@@ -89,7 +94,7 @@ fprintf(stderr, ">>> %s ( %p %p %f )\n", __func__, S, D, kf);
 
 foo = fimg_classif_trial(S, D, kf, 0);
 if (foo) {
-	fprintf(stderr, "%s err %d classif_trial %p\n", __func__,
+	fprintf(stderr, "%s error %d classif_trial %p\n", __func__,
 				foo, 		S);
 	return -98;
 	}
@@ -102,7 +107,7 @@ static void help(int lvl)
 Fx		*fx;
 int		foo;
 
-printf("-- fimg special effects -- %s %s --\n", __DATE__, __TIME__);
+printf("-*- fimg special effects -*- %s %s -*-\n", __DATE__, __TIME__);
 puts("usage:");
 puts("\tfimgfx [options] <effect> source.fimg resultat.fimg");
 
@@ -121,7 +126,7 @@ for (fx=fx_list; fx->name; fx++) {
 		foo = 0;
 		}
 	}
-puts("");
+puts("\n");
 fimg_print_version(1);
 exit(0);
 }
@@ -203,9 +208,13 @@ switch (action) {
 		foo = fimg_mirror(&src, &dest, 0);
 		break;
 	case Fx_shift0:
-		fprintf(stderr, "Krkrk %d\n", action);
+		// fprintf(stderr, "Krkrk %d\n", action);
 		foo = fimg_auto_shift_to_zero(&src, &dest);
 		break;
+	case Fx_trimul:
+		fprintf(stderr, "trimul %d\n", action);
+		foo = fimg_sfx_triplemul(&src, &dest, 0);
+		break;
 	case Fx_ctr2x2:
 		foo = fimg_contour_2x2(&src, &dest, 0);
 		break;