From 03a9bfd7d247ee32023a43efe9956a9407d12fa7 Mon Sep 17 00:00:00 2001
From: Don Bright <hugh.m.bright@gmail.com>
Date: Wed, 11 Sep 2013 21:47:23 -0500
Subject: lodepng: write RGB instead of RGBA: decoders differ on alpha
 rendering


diff --git a/src/imageutils-lodepng.cc b/src/imageutils-lodepng.cc
index 9f3afda..46b593d 100644
--- a/src/imageutils-lodepng.cc
+++ b/src/imageutils-lodepng.cc
@@ -11,12 +11,9 @@ bool write_png(std::ostream &output, unsigned char *pixels, int width, int heigh
 {
 	std::vector<unsigned char> dataout;
 	lodepng::State state;
-	state.info_png.background_defined = true;
-	Color4f bg = RenderSettings::inst()->color(RenderSettings::BACKGROUND_COLOR);
-	state.info_png.background_r = bg(0);
-	state.info_png.background_g = bg(1);
-	state.info_png.background_b = bg(2);
-	state.info_png.color.colortype = LCT_RGBA;
+	state.encoder.auto_convert = LAC_NO;
+	// some png renderers have different interpretations of alpha, so don't use it
+	state.info_png.color.colortype = LCT_RGB;
 	state.info_png.color.bitdepth = 8;
 	unsigned err = lodepng::encode(dataout, pixels, width, height, state);
 	if ( err ) return false;
-- 
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