From 516dd75e9c2692c5f17ee7e9a5b64a82506b94d5 Mon Sep 17 00:00:00 2001
From: Pierre-Yves Nicolas <6371790+pynicolas@users.noreply.github.com>
Date: Wed, 25 Mar 2026 09:06:04 +0100
Subject: [PATCH] Fix grayscale PDF export: partial revert of 40314de

---
 .../java/org/fairscan/imageprocessing/PostProcessing.kt    | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/imageprocessing/src/main/java/org/fairscan/imageprocessing/PostProcessing.kt b/imageprocessing/src/main/java/org/fairscan/imageprocessing/PostProcessing.kt
index 76dd90d..6aedb86 100644
--- a/imageprocessing/src/main/java/org/fairscan/imageprocessing/PostProcessing.kt
+++ b/imageprocessing/src/main/java/org/fairscan/imageprocessing/PostProcessing.kt
@@ -316,11 +316,14 @@ fun enhanceGrayscaleImage(img: Mat): Mat {
     val denoised = Mat()
     Imgproc.bilateralFilter(stretched8u, denoised, 9, 20.0, 10.0)
 
+    val finalBgr = Mat()
+    Imgproc.cvtColor(denoised, finalBgr, Imgproc.COLOR_GRAY2BGR)
+
     // -- Cleanup -----------
     gray.release(); imgFloat.release(); logImg.release()
     blur.release(); logBlur.release(); diff.release()
     retinex.release(); result8u.release()
-    stretched8u.release();
+    stretched8u.release(); denoised.release()
 
-    return denoised
+    return finalBgr
 }