diff --git a/Fonderie/essai.sh b/Fonderie/essai.sh
index 9b38da8d..9351e57d 100755
--- a/Fonderie/essai.sh
+++ b/Fonderie/essai.sh
@@ -9,8 +9,8 @@ FILTRES=$(./t -L | awk 'NR>1 { print $1 }' | sort)
 
 rm /tmp/fstack*.png
 
-# SRC=$(ls -rt1 $HOME/Essais/FondageDePlomb/capture/* | tail -1)
-SRC=mire.fimg
+SRC=$(ls -rt1 $HOME/Essais/FondageDePlomb/capture/* | tail -1)
+# SRC=mire.fimg
 
 for F in $FILTRES
 do
diff --git a/funcs/saturation.c b/funcs/saturation.c
index 5254463b..a3357858 100644
--- a/funcs/saturation.c
+++ b/funcs/saturation.c
@@ -71,10 +71,14 @@ return 0;
 }
 
 /* -------------------------------------------------------------- */
+/*
+ *    I think that this function is fully buggy
+ */
 int  fimg_auto_shift_to_zero(FloatImg *src, FloatImg *dst)
 {
 float		coefs[6];
 int		foo;
+float		minima = 1e7;		/* magic value ? */
 
 if (FIMG_TYPE_RGB != src->type) {
 	fprintf(stderr, "%s: bad image type %d\n", __func__, src->type);
@@ -87,6 +91,13 @@ if (foo) {
 	return foo;
 	}
 
+/* crude hack for now */
+if (coefs[0] < minima)	minima = coefs[0];
+if (coefs[2] < minima)	minima = coefs[2];
+if (coefs[4] < minima)	minima = coefs[4];
+
+coefs[0] = coefs[2] = coefs[4] = minima;
+
 foo = fimg_shift_to_zero(src, dst, coefs);
 if (foo) {
 	fprintf(stderr, "%s WTF?\n", __func__);