From 3e6c47ad673d1faeee114206c5273f107cdd2d7b Mon Sep 17 00:00:00 2001
From: esimov <endsimo@publicisgroupe.net>
Date: Sun, 12 Nov 2023 16:51:29 +0200
Subject: [PATCH] fix: panic on grayscale image #6

---
 stackblur.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stackblur.go b/stackblur.go
index aa759be..b35da35 100755
--- a/stackblur.go
+++ b/stackblur.go
@@ -423,7 +423,7 @@ func toNRGBA(img image.Image) *image.NRGBA {
 				dst.Pix[di+2] = c
 				dst.Pix[di+3] = 0xff
 				di += 4
-				si += 2
+				si++
 			}
 		}
 	default: