From f3ed470d578fcad7ff740acd5f0b0ec4f64de6fc Mon Sep 17 00:00:00 2001
From: "Sascha L. Teichmann" <sascha.teichmann@intevation.de>
Date: Sun, 26 Oct 2014 23:53:58 +0100
Subject: [PATCH] Set transparency attenuation to %45 + 2%/m.

---
 common/colors.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/common/colors.go b/common/colors.go
index 5edef65..f463825 100644
--- a/common/colors.go
+++ b/common/colors.go
@@ -115,8 +115,8 @@ func (colors *Colors) BlendColors(span *Span, col color.RGBA, pos int32) color.R
 	}
 	const scale = float32(1) / float32(100)
 	for ; curr != nil; curr = curr.Next {
-		// At least 35% attenuation + 5% extra for each depth meter.
-		factor := float32(min(100, 35+(curr.To-curr.From)*5)) * scale
+		// At least 45% attenuation + 2% extra for each depth meter.
+		factor := float32(min(100, 45+(curr.To-curr.From)*2)) * scale
 		col = BlendColor(colors.Colors[curr.Value], col, factor)
 	}
 	return col