From cc5bb56f3f2d67b6e89ed9b8811125a4432ad38e Mon Sep 17 00:00:00 2001
From: castano <castano@95f4ed2b-212e-0410-8b90-d31948207fce>
Date: Tue, 17 Jul 2007 01:53:56 +0000
Subject: [PATCH] Fix PSNR formula.

---
 src/nvimage/nvtt/tools/imgdiff.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/nvimage/nvtt/tools/imgdiff.cpp b/src/nvimage/nvtt/tools/imgdiff.cpp
index 9c277f0..9516af9 100644
--- a/src/nvimage/nvtt/tools/imgdiff.cpp
+++ b/src/nvimage/nvtt/tools/imgdiff.cpp
@@ -85,7 +85,7 @@ struct Error
 		mabse /= samples;
 		mse /= samples;
 		rmse = sqrt(mse);
-		psnr = (rmse == 0) ? 999.0f : 20.0f * log10(32767.0 / rmse);
+		psnr = (rmse == 0) ? 999.0f : 20.0f * log10(255.0 / rmse);
 	}
 
 	void print()