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commit b4f31a070f1a62f1d8eeb05d2d6eb03d2430124f
Author: Marc Lehmann 
Date:   Mon Jul 2 01:40:41 2012 +0000

    *** empty log message ***

diff --git a/src/perl/background b/src/perl/background

--- a/src/perl/background
+++ b/src/perl/background
@@ -159,6 +159,22 @@ moves it to the upper left corner of the screen (as opposed to the upper
 left corner of the terminal window)- the result is pseudo-transparency:
 the image seems to be static while the window is moved around.

+=head2 COLOUR SPECIFICATIONS
+
+Whenever an oprator expects a "colour", then this can be specified in one
+of two ways: Either as string with an X11 colour specification, such as:
+
+   "red"               # named colour
+   "#f00"              # simple rgb
+   "[50]red"           # red with 50% alpha
+   "TekHVC:300/50/50"  # anything goes
+
+OR as an array reference with one, three or four components:
+
+   [0.5]               # 50% gray, 100% alpha
+   [0.5, 0, 0]         # dark red, no green or blur, 100% alpha
+   [0.5, 0, 0, 0.7]    # same with explicit 70% alpha
+
 =head2 CACHING AND SENSITIVITY

 Since some operations (such as C and C) can take a long time,

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