From f430a41192ab83e08e5acb181bdce85694a4982e Mon Sep 17 00:00:00 2001
From: minodisk <daisuke.mino@gmail.com>
Date: Mon, 25 May 2015 18:18:32 +0900
Subject: [PATCH] Fix wrong color with RGBA input

---
 converter.go   | 6 +++---
 resize_test.go | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/converter.go b/converter.go
index 84bd284..b3dd06b 100644
--- a/converter.go
+++ b/converter.go
@@ -131,11 +131,11 @@ func resizeRGBA(in *image.RGBA, out *image.NRGBA, scale float64, coeffs []int16,
 
 					// reverse alpha-premultiplication.
 					if a != 0 {
-						r *= 0xffff
+						r *= 0xff
 						r /= a
-						g *= 0xffff
+						g *= 0xff
 						g /= a
-						b *= 0xffff
+						b *= 0xff
 						b /= a
 					}
 
diff --git a/resize_test.go b/resize_test.go
index ee31ac4..0c6093b 100644
--- a/resize_test.go
+++ b/resize_test.go
@@ -46,7 +46,7 @@ func Test_CorrectResize(t *testing.T) {
 	}
 }
 
-func Test_SameColor(t *testing.T) {
+func Test_SameColorWithRGBA(t *testing.T) {
 	img := image.NewRGBA(image.Rect(0, 0, 20, 20))
 	for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
 		for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
@@ -56,7 +56,7 @@ func Test_SameColor(t *testing.T) {
 	out := Resize(10, 10, img, Lanczos3)
 	for y := out.Bounds().Min.Y; y < out.Bounds().Max.Y; y++ {
 		for x := out.Bounds().Min.X; x < out.Bounds().Max.X; x++ {
-			color := img.At(x, y).(color.RGBA)
+			color := out.At(x, y).(color.NRGBA)
 			if color.R != 0x80 || color.G != 0x80 || color.B != 0x80 || color.A != 0xFF {
 				t.Fail()
 			}