diff --git a/floatimg.h b/floatimg.h
index 35e9a177..790448e4 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -2,7 +2,7 @@
  *	floatimg.h
  */
 
-#define		FIMG_VERSION	67
+#define		FIMG_VERSION	71
 
 /*
  *	in memory descriptor
diff --git a/lib/fimg-core.c b/lib/fimg-core.c
index 421c7302..c07301d8 100644
--- a/lib/fimg-core.c
+++ b/lib/fimg-core.c
@@ -197,6 +197,14 @@ return 0;
 int fimg_add_rgb(FloatImg *head, int x, int y, float r, float g, float b)
 {
 int	offset;
+
+if (head->type != FIMG_TYPE_RGB) {
+#if DEBUG_LEVEL > 1
+	fprintf(stderr, "%s : type %d is bad.\n", __func__, head->type);
+#endif
+	return -1;
+	}
+
 offset = x + (y * head->width);
 head->R[offset] += r;
 head->G[offset] += g;
diff --git a/v4l2/rgb2fimg.c b/v4l2/rgb2fimg.c
index 7cd6ba8b..9e839d71 100644
--- a/v4l2/rgb2fimg.c
+++ b/v4l2/rgb2fimg.c
@@ -41,9 +41,8 @@ for (y=0; y<h; y++) {
 		r = (float)*src++;
 		g = (float)*src++;
 		b = (float)*src++;
-		fimg_plot_rgb(d, xx, yy, r, g, b);
+		fimg_add_rgb(d, xx, yy, r, g, b);
 		}
-
 	} 
 
 modz++;