diff --git a/doc/pic_gray8.jpg b/doc/pic_gray8.jpg
index 4b68d77..7133364 100644
Binary files a/doc/pic_gray8.jpg and b/doc/pic_gray8.jpg differ
diff --git a/tools/cc2640r2_etag.html b/tools/cc2640r2_etag.html
index fdbcbad..6a70088 100644
--- a/tools/cc2640r2_etag.html
+++ b/tools/cc2640r2_etag.html
@@ -194,7 +194,7 @@
           let lut = 0;
           switch (data) {
             case 'gray8': 
-              lut = 1;
+              lut = 2;
               break;
             case 'user': 
               lut = 0xff;