From c47491041466043a260412504f4294a2b458ebdb Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Sat, 5 Aug 2017 10:36:48 +0200
Subject: [PATCH] doc/filters.texi: add yet another laplacian edge detector

---
 doc/filters.texi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/filters.texi b/doc/filters.texi
index a920bf935e..7e5a9a625a 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -5880,6 +5880,12 @@ Apply edge detect:
 convolution="0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:5:5:5:1:0:128:128:128"
 @end example
 
+@item
+Apply laplacian edge detector which includes diagonals:
+@example
+convolution="1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:5:5:5:1:0:128:128:0"
+@end example
+
 @item
 Apply emboss:
 @example