diff --git a/lib/t.c b/lib/t.c
index f2fe167..9b9e4d7 100644
--- a/lib/t.c
+++ b/lib/t.c
@@ -190,13 +190,17 @@ if (foo) {
 	return foo;
 	}
 
-fimg_get_minmax_rgb(&dessin, vals);
+foo = fimg_get_minmax_rgb(&dessin, vals);
+if (foo) {
+	fprintf(stderr, "%s: err %d on fimg_get_minmax_rgb\n",
+			__func__, foo);
+	return foo;
+	}
 
 for (foo=0; foo<6; foo++) {
 	fprintf(stderr, "%7d    %17.6g\n", foo, vals[foo]);
 	}
 
-
 return -1;
 }
 /* ---------------------------------------------------------------- */
diff --git a/tools/README.md b/tools/README.md
new file mode 100644
index 0000000..25958ac
--- /dev/null
+++ b/tools/README.md
@@ -0,0 +1,11 @@
+# Images en virgule flottante, les outils.
+
+## mkfimg
+
+## fimgops
+
+## fimgfx
+
+## fimgstats
+
+## fimg2pnm - fimg2png
diff --git a/tools/fimgstats.c b/tools/fimgstats.c
index 59877a0..e5ddfd3 100644
--- a/tools/fimgstats.c
+++ b/tools/fimgstats.c
@@ -18,9 +18,11 @@ int various_numbers(FloatImg *fimg, int k)
 float		moyennes[4];
 int		foo;
 float		fvalue;
+float		vals[6];
 
-if (verbosity)
+if (verbosity) {
 	fprintf(stderr, "     numbers from %p :\n", fimg); 
+	}
 
 fimg_printhead(fimg);
 fprintf(stderr, "surface      %d\n", fimg->width * fimg->height);
@@ -30,14 +32,27 @@ fprintf(stderr, "mean values:\n");
 for (foo=0; foo<4; foo++)
 	printf("      %c   %14.6f\n", "RGBA"[foo], moyennes[foo]);
 
+/*
 fvalue = fimg_get_maxvalue(fimg);
-printf("max value       %f\n", fvalue);
+printf("max value     %f\n", fvalue);
+*/
 
 foo = fimg_count_negativ(fimg);
 if (foo) {
 	fprintf(stderr, "%d negative values\n", foo);
 	}
 
+foo = fimg_get_minmax_rgb(fimg, vals);
+if (foo) {
+	fprintf(stderr, "%s: err %d on fimg_get_minmax_rgb\n",
+			__func__, foo);
+	return foo;
+	}
+
+printf("Rmin  %12.4g    Rmax  %12.4g\n", vals[0], vals[1]);
+printf("Gmin  %12.4g    Gmax  %12.4g\n", vals[2], vals[3]);
+printf("Bmin  %12.4g    Bmax  %12.4g\n", vals[4], vals[5]);
+
 return 0;
 }
 /* --------------------------------------------------------------------- */
@@ -80,6 +95,7 @@ if (argc == 1) {
 	foo = fimg_print_version(1); help(0);
 	exit(0);
 	}
+
 while ((opt = getopt(argc, argv, "cv")) != -1) {
 	switch(opt) {
 		case 'c':	make_csv++;		break;