diff --git a/tools/fimg2png.c b/tools/fimg2png.c
index f7322799..b546c1e2 100644
--- a/tools/fimg2png.c
+++ b/tools/fimg2png.c
@@ -11,7 +11,7 @@
 int		verbosity;
 
 /* ----------------------------------------------------------------- */
-int convertir_fimg_en_PNG(char *srcname, char *dstname, int notused)
+int convertir_fimg_en_PNG(char *srcname, char *dstname, int grisaille)
 {
 int		foo, infos[3];
 FloatImg	fimg;
@@ -22,7 +22,10 @@ fprintf(stderr, ">>> %25s ( '%s' '%s' %d )\n", __func__,
 #endif
 
 foo = fimg_fileinfos(srcname, infos);
-if (foo) { fprintf(stderr, "'%s' get dims -> %d\n", srcname, foo); }
+if (foo) {
+	if (verbosity) fprintf(stderr, "'%s' get dims -> %d\n", srcname, foo);
+	return foo;
+	}
 
 if (verbosity) {
 	fprintf(stderr, "image '%s' is %d x %d  %s\n",
@@ -36,6 +39,10 @@ if (foo) {
 	return -1;
 	}
 
+if (grisaille) {
+	foo = fimg_desaturate(&fimg, &fimg, 0);
+	}
+
 foo = fimg_save_as_png(&fimg, dstname, 0);
 if (foo) {
 	fprintf(stderr, "saving as png '%s' -> %d\n", dstname, foo);
@@ -47,19 +54,40 @@ fimg_destroy(&fimg);
 return 0;
 }
 /* ----------------------------------------------------------------- */
+void help(int k)
+{
+
+puts("usage:\n\tfimg2png [options] foo.fimg bar.png");
+puts("options:");
+puts("\t-g\tconvert to gray");
+puts("\t-v\tincrease verbosity");
+if (verbosity) fimg_print_version(1);
+
+exit(0);
+}
+/* ----------------------------------------------------------------- */
 
 int main(int argc, char *argv[])
 {
-int		foo;
+int		foo, opt;
+int		to_gray = 0;
 
-if (3 != argc) {
-	fimg_print_version(1);
-	fprintf(stderr, "usage:\n\t%s foo.fimg bar.png\n", argv[0]);
+while ((opt = getopt(argc, argv, "ghv")) != -1) {
+	switch(opt) {
+		case 'g':	to_gray = 1;		break;
+		case 'v':	verbosity++;		break;
+		case 'h':	help(1);		exit(1);
+		}
+	}
+
+if (2 != argc-optind) {
+	fprintf(stderr, "error: %s need two filenames\n", argv[0]);
 	exit(1);
 	}
 
-foo = convertir_fimg_en_PNG(argv[1], argv[2], 0);
-fprintf(stderr, "%s : got a %d from convertor\n", argv[0], foo);
+foo = convertir_fimg_en_PNG(argv[optind], argv[optind+1], to_gray);
+if (verbosity)
+	fprintf(stderr, "%s : got a %d from convertor\n", argv[0], foo);
 
 return 0;
 }
diff --git a/v4l2/t.c b/v4l2/t.c
index 08cb6a45..bf537fa5 100644
--- a/v4l2/t.c
+++ b/v4l2/t.c
@@ -43,6 +43,7 @@ if (0 != foo)	{
 
 pr_v4l2_format("after ioctl VIDIOC_G_FMT", &fmt);
 
+/* this function is bugged */
 
 return k;
 }