diff --git a/Fonderie/sfx.c b/Fonderie/sfx.c
index 196e3b1..6cfd82f 100644
--- a/Fonderie/sfx.c
+++ b/Fonderie/sfx.c
@@ -24,6 +24,9 @@ extern	int		verbosity;
 /* -------------------------------------------------------------- */
 /*
  * nouveau Sun Jul 16 07:37:22 UTC 2023
+ *
+ *	may-be this can be an on-place function ?
+ *
  */
 int poke_sup_rb_g(FloatImg *src, FloatImg *dst)
 {
@@ -46,7 +49,7 @@ if (verbosity > 1)
 for (idx=0; idx<nbpix; idx++) {
 	dst->R[idx] = src->R[idx];
 	dst->B[idx] = src->B[idx];
-	if (src->R[idx] > src->B[idx])
+	if (src->R[idx] < src->B[idx])
 		dst->G[idx] = src->R[idx];
 	else
 		dst->G[idx] = src->B[idx];