From ac8a9c38db405425efca3af1104162b58d0ae05a Mon Sep 17 00:00:00 2001
From: Hakan Seven <hakanseven8125@gmail.com>
Date: Mon, 28 Sep 2026 18:29:00 +0300
Subject: [PATCH] fix(plot): true-color hatch fills plot in their own colour,
 not black

Fixes #1417

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 src/io/pdf_export.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/io/pdf_export.rs b/src/io/pdf_export.rs
index 3f1810a68..2a1361922 100644
--- a/src/io/pdf_export.rs
+++ b/src/io/pdf_export.rs
@@ -1291,6 +1291,9 @@ fn emit_hatch(
         g = 1.0;
         b = 1.0;
     } else if !color_overridden
+        // `aci == 0` is an explicit true colour: it plots as drawn, only
+        // indexed colours meant for the dark screen are adapted. (#1417)
+        && hatch.aci != 0
         && !(hatch.aci == 7 && matches!(hatch.pattern, HatchPattern::Solid))
     {
         let is_light = r > 0.80 && g > 0.80 && b > 0.80;