doc/filters.texi: add yet another laplacian edge detector

8 years ago · c474910414
parent 44e9783ab9
commit c474910414
1 changed files with 6 additions and 0 deletions
--- 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