shithub: ifilter

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update usage and README

--- a/README

+++ b/README

@@ -28,6 +28,7 @@

 Available filters are:

 - box: 3x3 box blur

+- gaussian: Gaussian blur using `-s` as the convolution kernel radius (ie kernel will be a matrix r*r with r=2*size+1)

 - pixelate: a simple pixelation filter using `-s` argument as pixel size

--- a/blur.c

+++ b/blur.c

@@ -141,7 +141,7 @@

 void

 usage(void)

 {

-	fprint(2, "usage: %s [-s size] [box|pixelate]\n", argv0);

+	fprint(2, "usage: %s [-s size] [box|gaussian|pixelate]\n", argv0);

 	exits("usage");

 }