diff --git a/tools/mkfimg.c b/tools/mkfimg.c
index ef908ee..fbe6cd7 100644
--- a/tools/mkfimg.c
+++ b/tools/mkfimg.c
@@ -9,19 +9,37 @@
 int		verbosity;
 
 /* --------------------------------------------------------------------- */
-#define		T_BLACK		0
-#define		T_DRAND48	1
-#define		T_RGB_0		2
+#define		T_BLACK		1
+#define		T_DRAND48	2
+#define		T_GRAY		3
+typedef struct {
+	int		code;
+	char		*name;
+	} Type;
+
+Type types[] = {
+	{ T_BLACK,	"black"			},
+	{ T_DRAND48,	"drand48"		},
+	{ T_GRAY,	"gray"			},
+	{ T_GRAY,	"grey"			}
+	};
+
 static int get_type(char *name)
 {
+Type	*type;
 
 #if DEBUG_LEVEL
 fprintf(stderr, ">>> %s ( '%s' )\n", __func__, name);
 #endif
 
-#define TEST(str)	( ! strcmp(name, str) )
-if TEST("black")	return T_BLACK;
-if TEST("drand48")	return T_DRAND48;
+// #define TEST(str)	( ! strcmp(name, str) )
+
+for (type = types; type->code; type++) {
+	// printf("\t%-15s %d\n", type->name, type->code);
+	if (!strcmp(name, type->name)) {
+		return type->code;
+		}
+	}
 
 return -1;
 }
@@ -32,7 +50,7 @@ static void help(int lj)
 puts("Usage:\tmkfimg [options]  quux.fimg width height");
 
 puts("\t-k N.N\tgive a float parameter");
-puts("\t-t bla\t\howto make the pic");
+puts("\t-t bla\t\thowto make the pic");
 puts("\t\t\tblack, drand48...");
 puts("\t-v\tincrease verbosity");
 
@@ -46,8 +64,9 @@ int main(int argc, char *argv[])
 int		foo, opt;
 int		width, height;
 char		*fname;
-float		fvalue = 0.00001;
-int		type = 0;
+float		fvalue = 0.01;
+int		type = T_BLACK;
+char		*tname = "wtf?";
 
 FloatImg	fimg;
 
@@ -55,7 +74,7 @@ while ((opt = getopt(argc, argv, "hk:t:v")) != -1) {
 	switch(opt) {
 		case 'h':	help(0);			break;
 		case 'k':	fvalue = atof(optarg);		break;
-		case 't':	type = get_type(optarg);	break;
+		case 't':	type = get_type(tname=optarg);	break;
 		case 'v':	verbosity++;			break;
 		}
 	}
@@ -71,6 +90,11 @@ if (3 != argc-optind) {
 	exit(1);
 	}
 
+if (type < 0) {
+	fprintf(stderr, "type '%s' is unknow\n", tname);
+	exit(2);
+	}
+
 fname = argv[optind];
 width = atoi(argv[optind+1]);	height = atoi(argv[optind+2]);	
 
@@ -81,13 +105,15 @@ srand48(getpid() ^ time(NULL));
 foo = fimg_create(&fimg, width, height, 3);
 if (foo) {
 	fprintf(stderr, "create floatimg -> %d\n", foo);
-	exit(1);
+	exit(3);
 	}
 
 switch(type) {
 	default:
 	case T_BLACK:		fimg_clear(&fimg);		break;
-	case T_DRAND48:		fimg_drand48(&fimg, 1.0);	break;
+	case T_DRAND48:		fimg_drand48(&fimg, fvalue);	break;
+	case T_GRAY:		fimg_rgb_constant(&fimg, fvalue, fvalue, fvalue);
+				break;
 	}
 
 foo = fimg_dump_to_file(&fimg, fname, 0);