From 1208ac55766e410f7cac3ad9d6cf588e7846ca64 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Fri, 22 Apr 2011 12:23:25 -0400
Subject: Take into account color intensity for filtered transparency in canvas
 export.

---
 libdimension/png.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'libdimension/png.c')

diff --git a/libdimension/png.c b/libdimension/png.c
index 9ff2afc..7a327d6 100644
--- a/libdimension/png.c
+++ b/libdimension/png.c
@@ -94,7 +94,7 @@ dmnsn_png_optimizer_fn(const dmnsn_canvas *canvas,
     pixel[2] = sRGB.B*UINT16_MAX;
   }
 
-  double alpha = color.filter + color.trans;
+  double alpha = dmnsn_color_intensity(color)*color.filter + color.trans;
   if (alpha <= 0.0) {
     pixel[3] = 0;
   } else if (alpha >= 1.0) {
-- 
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