Support GRAYA image format
diff --git a/MagickCore/coder.c b/MagickCore/coder.c
index 48c3711..c544978 100644
--- a/MagickCore/coder.c
+++ b/MagickCore/coder.c
@@ -136,6 +136,7 @@
     { "GIF87", "GIF" },
     { "G", "RAW" },
     { "GRANITE", "MAGICK" },
+    { "GRAYA", "GRAY" },
     { "GROUP4", "TIFF" },
     { "GV", "DOT" },
     { "HTM", "HTML" },