diff --git a/Fonderie/crapulator.c b/Fonderie/crapulator.c
index a7e5b51..47cfca7 100644
--- a/Fonderie/crapulator.c
+++ b/Fonderie/crapulator.c
@@ -183,6 +183,9 @@ switch (idFx) {
 	case 17:
 		retval = mirror_split(image, 0);
 		break;
+	case 18:
+		retval = upside_down(image);
+		break;
 
 	/* here are the glitches */
 	case 24:			/* experiment ! */
@@ -217,6 +220,7 @@ switch (num) {
 	case 0:		return "none";
 	case 8:		return "ctr2x2";
 	case 13:	return "fltr3x3";
+	case 18:	return "updown";
 	}
 
 return "???";
diff --git a/Fonderie/filterstack.c b/Fonderie/filterstack.c
index ee63768..2ea9fdc 100644
--- a/Fonderie/filterstack.c
+++ b/Fonderie/filterstack.c
@@ -76,7 +76,7 @@ if (numid < 0 || numid > NUMBER_OF_STACK) {
 fprintf(stderr, "--- %2d -- %-20s --------\n", numid, txt);
 // fprintf(stderr, "stack at %p, size %d, current %d\n",
 //			f_slots, nbre_filters, idx_slot); 
-fprintf(stderr, "idx     fx#   name          ival   fval\n");
+fprintf(stderr, "idx ___ fx# _ name ________ ival _ fval ___\n");
 
 for (idx=0; idx<f_stacks[numid].count; idx++) {
 
@@ -122,7 +122,9 @@ for (idx=0; idx<f_stacks[numid].count; idx++) {
 	foo = crapulator(target, eff, fv);
 
 	if (foo) {
-		fprintf(stderr, "crapulator error %d\n", foo);
+		fprintf(stderr,
+			"crapulator give me error %d on effect %d\n",
+						foo, 		eff);
 		return foo;
 		}
 	}
diff --git a/Fonderie/interpolator.c b/Fonderie/interpolator.c
index 4d8e367..bf2583f 100644
--- a/Fonderie/interpolator.c
+++ b/Fonderie/interpolator.c
@@ -76,7 +76,8 @@ for (idx=0; idx<nombre; idx++) {
 		return -1;
 		}
 	if (verbosity)
-		fprintf(stderr, "%5d   %s   %f\r", idx, filename, metrique);
+		fprintf(stderr, "%5d   %s   %10.3f\r", 
+					idx, filename, metrique);
 	idxvalues[idx].idx = idx;
 	idxvalues[idx].value = metrique;
 	average += (double)metrique;
diff --git a/Fonderie/sfx.c b/Fonderie/sfx.c
index d201536..42ec40a 100644
--- a/Fonderie/sfx.c
+++ b/Fonderie/sfx.c
@@ -18,6 +18,58 @@
  */
 extern	int		verbosity;
 
+/* -------------------------------------------------------------- */
+/* nouveau du 19 decembre 2020, pour le grand ecran de da Scritch */
+
+int upside_down(FloatImg *pimg)
+{
+float		*rowpix;
+float		*Ps, *Pd;
+int		Os, Od;			/* offset of lines */
+int		wsz;
+int		ya, y2;
+
+fprintf(stderr, "%s: image width is %d\n", __func__, pimg->width);
+
+rowpix = calloc(pimg->width, sizeof(float));
+if (NULL==rowpix) {
+	fprintf(stderr, "%s : memory full\n", __func__);
+	exit(1);
+	}
+
+wsz = pimg->width * sizeof(float);
+fprintf(stderr, "%s: wsx = %d\n", __func__, wsz);
+
+for (ya=0; ya<pimg->height/2; ya++) {
+
+	y2 = pimg->height - (ya+1);
+	Os = (pimg->width * ya);
+	Od = (pimg->width * y2);
+
+	/* let's go, crash coredumping... */
+	Ps = pimg->R + Os;
+	Pd = pimg->R + Od;
+	memcpy(rowpix, Ps,     wsz);
+	memcpy(Ps,     Pd,     wsz);
+	memcpy(Pd,     rowpix, wsz);
+
+	Ps = pimg->G + Os;
+	Pd = pimg->G + Od;
+	memcpy(rowpix, Ps,     wsz);
+	memcpy(Ps,     Pd,     wsz);
+	memcpy(Pd,     rowpix, wsz);
+
+	Ps = pimg->B + Os;
+	Pd = pimg->B + Od;
+	memcpy(rowpix, Ps,     wsz);
+	memcpy(Ps,     Pd,     wsz);
+	memcpy(Pd,     rowpix, wsz);
+	}
+
+free(rowpix);
+
+return 0;
+}
 /* -------------------------------------------------------------- */
 /* nouveau du 9 decembre 2020, en ecoutant le Fermion raconter du
    superbe portnawak  */
@@ -113,7 +165,7 @@ return 0;
 int trinarize(FloatImg *pimg, int notused)
 {
 float		mm[6], mRa, mGa, mBa, mRb, mGb, mBb;
-float		val, *fptr;
+float		*fptr;
 int		foo, size;
 
 #if DEBUG_LEVEL
diff --git a/Fonderie/sfx.h b/Fonderie/sfx.h
index e54c911..7566680 100644
--- a/Fonderie/sfx.h
+++ b/Fonderie/sfx.h
@@ -6,6 +6,7 @@
 int bouger_les_pixels(FloatImg *pimg, int kaboo);
 
 int mirror_split(FloatImg *pimg, int kaboo);
+int upside_down(FloatImg *pimg);
 
 int des_bords_sombres_a(FloatImg *pimg, int offset);
 
diff --git a/Fonderie/t.c b/Fonderie/t.c
index 352c7e2..974d191 100644
--- a/Fonderie/t.c
+++ b/Fonderie/t.c
@@ -76,7 +76,7 @@ int main(int argc, char *argv[])
 {
 int		foo;
 int		opt;
-char		*filterchain = "0";
+char		*filterchain = "18";
 
 fprintf(stderr, "*** %s : compiled by tTh, %s %s\n", __FILE__,
 			__DATE__, __TIME__);
@@ -100,7 +100,7 @@ if (foo) {
 	exit(1);
 	}
 
-foo = essai_filterstack("mire.fimg");
+foo = essai_filterstack("01137.fimg");
 if (foo) {
 	fprintf(stderr, "err %d in essai_filterstack\n", foo);
 	exit(1);