diff --git a/essai.c b/essai.c
index 1112a99..08f4a3f 100644
--- a/essai.c
+++ b/essai.c
@@ -50,7 +50,11 @@ if (verbosity) fimg_print_version(0);
 fimg_create(&fimgA, W, H, 3);
 fimg_create(&fimgB, W, H, 3);
 
+fimg_clear(&fimgA);
+
 fimg_drand48(&fimgB, 100.0);
+foo = fimg_dump_to_file(&fimgB, "B.fimg", 0);
+
 fimg_timer_set(0);
 #define NBP 500
 for (foo=0; foo<NBP; foo++) {
@@ -59,11 +63,12 @@ for (foo=0; foo<NBP; foo++) {
 		}
 	fait_un_dessin(&fimgB);
 	fimg_add(&fimgA, &fimgB, &fimgA);
-	fimg_mul(&fimgA, &fimgB, &fimgA);
+	// fimg_mul(&fimgA, &fimgB, &fimgA);
 	}
 tb = fimg_timer_get(0);
 fprintf(stderr, "%s = %f seconds\n", __func__, tb);
 foo = fimg_save_as_pnm(&fimgA, "drand48.pnm", 0);
+foo = fimg_dump_to_file(&fimgA, "drand48.fimg", 0);
 
 fimg_destroy(&fimgA);
 fimg_destroy(&fimgB);