diff --git a/src/nvimage/DirectDrawSurface.cpp b/src/nvimage/DirectDrawSurface.cpp
index dea1f95..7ad08c3 100644
--- a/src/nvimage/DirectDrawSurface.cpp
+++ b/src/nvimage/DirectDrawSurface.cpp
@@ -683,7 +683,14 @@ void DDSHeader::setPixelFormat(uint bitcount, uint rmask, uint gmask, uint bmask
 
     if (rmask != 0 || gmask != 0 || bmask != 0)
     {
-        this->pf.flags = DDPF_RGB;
+        if (gmask == 0 && bmask == 0)
+        {
+            this->pf.flags = DDPF_LUMINANCE;
+		}
+        else
+        {
+            this->pf.flags = DDPF_RGB;
+        }
 
         if (amask != 0) {
             this->pf.flags |= DDPF_ALPHAPIXELS;
@@ -867,9 +874,9 @@ bool DirectDrawSurface::isSupported() const
                 return false;
             }
         }
-        else if (header.pf.flags & DDPF_RGB)
+        else if ((header.pf.flags & DDPF_RGB) || (header.pf.flags & DDPF_LUMINANCE))
         {
-            // All RGB formats are supported now.
+            // All RGB and luminance formats are supported now.
         }
         else
         {
@@ -1294,7 +1301,7 @@ uint DirectDrawSurface::mipmapSize(uint mipmap) const
     }
     else
     {
-        nvDebugCheck(header.pf.flags & DDPF_RGB);
+        nvDebugCheck((header.pf.flags & DDPF_RGB) || (header.pf.flags & DDPF_LUMINANCE));
 
         // Align pixels to bytes.
         uint byteCount = (header.pf.bitcount + 7) / 8;
@@ -1364,6 +1371,7 @@ void DirectDrawSurface::printInfo() const
     printf("Pixel Format:\n");
     printf("\tFlags: 0x%.8X\n", header.pf.flags);
     if (header.pf.flags & DDPF_RGB) printf("\t\tDDPF_RGB\n");
+    if (header.pf.flags & DDPF_LUMINANCE) printf("\t\tDDPF_LUMINANCE\n");
     if (header.pf.flags & DDPF_FOURCC) printf("\t\tDDPF_FOURCC\n");
     if (header.pf.flags & DDPF_ALPHAPIXELS) printf("\t\tDDPF_ALPHAPIXELS\n");
     if (header.pf.flags & DDPF_ALPHA) printf("\t\tDDPF_ALPHA\n");
diff --git a/src/nvtt/tools/compress.cpp b/src/nvtt/tools/compress.cpp
index e77cd99..2444ac2 100644
--- a/src/nvtt/tools/compress.cpp
+++ b/src/nvtt/tools/compress.cpp
@@ -142,6 +142,7 @@ int main(int argc, char *argv[])
 	bool fast = false;
 	bool nocuda = false;
 	bool bc1n = false;
+	bool luminance = false;
 	nvtt::Format format = nvtt::Format_BC1;
 	bool premultiplyAlpha = false;
 	nvtt::MipmapFilter mipmapFilter = nvtt::MipmapFilter_Box;
@@ -217,6 +218,11 @@ int main(int argc, char *argv[])
 		{
 			format = nvtt::Format_RGB;
 		}
+		else if (strcmp("-lumi", argv[i]) == 0)
+		{
+			luminance = true;
+			format = nvtt::Format_RGB;
+		}
 		else if (strcmp("-bc1", argv[i]) == 0)
 		{
 			format = nvtt::Format_BC1;
@@ -315,6 +321,7 @@ int main(int argc, char *argv[])
 		printf("  -fast    \tFast compression.\n");
 		printf("  -nocuda  \tDo not use cuda compressor.\n");
 		printf("  -rgb     \tRGBA format\n");
+		printf("  -lumi    \tLUMINANCE format\n");
 		printf("  -bc1     \tBC1 format (DXT1)\n");
 		printf("  -bc1n    \tBC1 normal map format (DXT1nm)\n");
 		printf("  -bc1a    \tBC1 format with binary alpha (DXT1a)\n");
@@ -478,11 +485,17 @@ int main(int argc, char *argv[])
 
 	if (format == nvtt::Format_RGBA)
 	{
-		// @@ Edit this to choose the desired pixel format:
-	//	compressionOptions.setPixelType(nvtt::PixelType_Float);
-	//	compressionOptions.setPixelFormat(16, 16, 16, 16);
-	//	compressionOptions.setPixelType(nvtt::PixelType_UnsignedNorm);
-	//	compressionOptions.setPixelFormat(16, 0, 0, 0);
+		if (luminance)
+		{
+			compressionOptions.setPixelFormat(8, 0xff, 0, 0, 0);
+		}
+		else {
+			// @@ Edit this to choose the desired pixel format:
+			//	compressionOptions.setPixelType(nvtt::PixelType_Float);
+			//	compressionOptions.setPixelFormat(16, 16, 16, 16);
+			//	compressionOptions.setPixelType(nvtt::PixelType_UnsignedNorm);
+			//	compressionOptions.setPixelFormat(16, 0, 0, 0);
+		}
 	}
 
 	if (fast)