From 3c3894314176fca9dd085147294fab53ac11cace Mon Sep 17 00:00:00 2001
From: David Schmenk <dschmenk@sbcglobal.net>
Date: Thu, 28 Nov 2024 11:52:58 -0800
Subject: [PATCH] Slightly better error calc for lookahead

---
 src/dhgr.tk/utils/dhgrrgb.pla | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/dhgr.tk/utils/dhgrrgb.pla b/src/dhgr.tk/utils/dhgrrgb.pla
index 39650e3..cd5f4a1 100644
--- a/src/dhgr.tk/utils/dhgrrgb.pla
+++ b/src/dhgr.tk/utils/dhgrrgb.pla
@@ -104,9 +104,9 @@ def rgbPix(r, g, b, x, y)#0
   ng = pg - ntscCycle[i+GRN] + ntscChroma[i+GRN]
   nb = pb - ntscCycle[i+BLU] + ntscChroma[i+BLU]
   if errDiv
-    nr = nr - errptr=>[3+RED] / errDiv
-    ng = ng - errptr=>[3+GRN] / errDiv
-    nb = nb - errptr=>[3+BLU] / errDiv
+    nr = nr - (errptr=>[3+RED] + (r - nr + 1) / 2) / errDiv
+    ng = ng - (errptr=>[3+GRN] + (g - ng + 1) / 2) / errDiv
+    nb = nb - (errptr=>[3+BLU] + (b - nb + 1) / 2) / errDiv
   fin
   nd = dist(r, g, b, nr, ng, nb)
   // Add current 1/4 chroma color