diff --git a/floatimg.h b/floatimg.h
index 19b52bec..8b4ea812 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -98,6 +98,7 @@ int fimg_filter_3x3(FloatImg *s, FloatImg *d, FimgFilter3x3 *filtr);
 /*	'sfx0' module 			*/
 int fimg_killcolors_a(FloatImg *fimg, float fval);
 int fimg_killcolors_b(FloatImg *fimg, float fval);
+int fimg_colors_mixer_a(FloatImg *fimg, float fval);
 
 /*	funcs/rotate.c module		*/
 /*	#coronamaison			*/
diff --git a/funcs/sfx0.c b/funcs/sfx0.c
index 6f1da282..729b8880 100644
--- a/funcs/sfx0.c
+++ b/funcs/sfx0.c
@@ -54,3 +54,33 @@ for (foo=0; foo<nbpix; foo++) {
 return 0;
 }
 /* --------------------------------------------------------------------- */
+int fimg_colors_mixer_a(FloatImg *fimg, float fval)
+{
+int		nbpix, foo;
+float		R, G, B;
+
+if (FIMG_TYPE_RGB != fimg->type) {
+	fprintf(stderr, "%s: bad src type %d on %p\n", __func__,
+					fimg->type, fimg);
+#if MUST_ABORT
+	abort();
+#endif
+	return -8;
+	}
+
+nbpix = fimg->width * fimg->height;
+
+for (foo=0; foo<nbpix; foo++) {
+
+	R = (fimg->G[foo] + fimg->B[foo]) / fval;
+	G = (fimg->R[foo] + fimg->B[foo]) / fval;
+	B = (fimg->R[foo] + fimg->G[foo]) / fval;
+
+	fimg->R[foo] = R;
+	fimg->G[foo] = G;
+	fimg->B[foo] = B;
+	}
+
+return 0;
+}
+/* --------------------------------------------------------------------- */