diff --git a/Fonderie/crapulator.c b/Fonderie/crapulator.c
index 83abc5d..ac3b3ed 100644
--- a/Fonderie/crapulator.c
+++ b/Fonderie/crapulator.c
@@ -76,9 +76,27 @@ fimg_destroy(&img);
 return retval;
 }
 /* -------------------------------------------------------------- */
+static int desaturate(FloatImg *pimg)
+{
+FloatImg		img;
+int 			retval;
+fimg_clone(pimg, &img, 0);
+retval = fimg_desaturate(pimg, &img, 0);
+if (retval) {
+	fprintf(stderr, "%s : err desaturate %d\n",
+			__func__, retval);
+	exit(1);
+	}
+fimg_copy_data(&img, pimg);
+fimg_destroy(&img);
+
+return 0;
+}
+/* -------------------------------------------------------------- */
 /*
- *	This is the main filter engine
- *	used both for input and output
+ *	This is the main filter engine used both for input and
+ *	output processing. It can be called by the filterstack
+ *	processor.
  */
 
 #define DEBUG_THIS_CRAP		0
@@ -128,7 +146,7 @@ switch (idFx) {
 				fimg_get_maxvalue(image)*0.8);
 		break;
 	case 6:
-		fimg_killcolors_a(image, 0.0);
+		retval = fimg_killcolors_a(image, 0.0);
 		break;
 	case 7:
 		retval = fimg_colors_mixer_a(image, 2.0);
@@ -151,6 +169,11 @@ switch (idFx) {
 	case 13:
 		retval = insitu_filtre3x3(image);
 		break;
+	case 14:
+		retval = desaturate(image);
+		break;
+
+	/* here are the glitches */
 	case 24:			/* experiment ! */
 		retval = des_bords_sombres_a(image, 160);
 		break;
diff --git a/Fonderie/essai.sh b/Fonderie/essai.sh
index 6b54512..91df6e4 100755
--- a/Fonderie/essai.sh
+++ b/Fonderie/essai.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-FILTRES="5:6:13 2:2 5:9:8 4:25 8:13:13:7 10:1 25:25:25:25"
+FILTRES="5:6:13 2:2 5:9:8 4:25 8:13:13:7 10:1 25:25:25:25 13:14:13"
 
 rm /tmp/fstack*.png
 
@@ -11,12 +11,12 @@ do
 	echo ; echo $I
 	./t -F $F
 	txt=$(printf "[%-10s]" $F)
-	convert foo.png -pointsize 28 -kerning 0	\
+	convert foo.png -pointsize 24 -kerning 0	\
 		-fill Gray80 -undercolor Gray20		\
 		-font Courier-Bold			\
-		-annotate +0+25 "$txt"			\
+		-annotate +0+23 "$txt"			\
 		$I
 
 done
 
-convert -delay 150 /tmp/fstack*.png foo.gif
+convert -delay 100 /tmp/fstack*.png foo.gif