ref: 0042570b78469f2f70fb8357df42db68b42117d1
parent: 67107b61b644fa2fe1376ff34dd928b70e1fdda8
author: phil9 <telephil9@gmail.com>
date: Mon Sep 6 01:14:39 EDT 2021
fix factors applied to the wrong color components in grayscale filter
--- a/ifilter.c
+++ b/ifilter.c
@@ -16,7 +16,7 @@
void
grayscale(uchar p[3])
{- uchar v = 0.2126*p[0] + 0.7152*p[1] + 0.0722*p[2];
+ uchar v = 0.2126*p[2] + 0.7152*p[1] + 0.0722*p[0];
p[0] = p[1] = p[2] = v;
}