From 2a67a0698ba93303823fb3a337ff864342e4a1e2 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 9 May 2016 17:47:41 +0530
Subject: [PATCH] A small speedup

---
 src/calibre/utils/imageops/imageops.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/calibre/utils/imageops/imageops.cpp b/src/calibre/utils/imageops/imageops.cpp
index 788fd23a69..5d56d6bce3 100644
--- a/src/calibre/utils/imageops/imageops.cpp
+++ b/src/calibre/utils/imageops/imageops.cpp
@@ -7,7 +7,6 @@
 
 #include <stdexcept>
 #include "imageops.h"
-#include <QColor>
 #include <QVector>
 #include <cmath>
 
@@ -140,7 +139,7 @@ QImage grayscale(const QImage &image) { // {{{
 		row = reinterpret_cast<QRgb*>(img.scanLine(r));
         for (pixel = row; pixel < row + width; pixel++) {
             gray = qGray(*pixel);
-            *pixel = QColor(gray, gray, gray).rgba();
+            *pixel = qRgb(gray, gray, gray);
         }
     }
 	return img;