From 88d64de67b63fccc41d2d569927b8d790f7837d8 Mon Sep 17 00:00:00 2001
From: Robert Sachunsky <sachunsky@informatik.uni-leipzig.de>
Date: Tue, 11 Oct 2022 07:20:38 +0000
Subject: [PATCH] pil2cv: reduce transparency to white

---
 sbb_binarize/ocrd_cli.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sbb_binarize/ocrd_cli.py b/sbb_binarize/ocrd_cli.py
index 57438d3..9737bad 100644
--- a/sbb_binarize/ocrd_cli.py
+++ b/sbb_binarize/ocrd_cli.py
@@ -30,6 +30,10 @@ def cv2pil(img):
 
 def pil2cv(img):
     # from ocrd/workspace.py
+    if img.mode in ('LA', 'RGBA'):
+        newimg = Image.new(img.mode[:-1], img.size, 'white')
+        newimg.paste(img, mask=img.getchannel('A'))
+        img = newimg
     color_conversion = cv2.COLOR_GRAY2BGR if img.mode in ('1', 'L') else  cv2.COLOR_RGB2BGR
     pil_as_np_array = np.array(img).astype('uint8') if img.mode == '1' else np.array(img)
     return cv2.cvtColor(pil_as_np_array, color_conversion)