From d0022f51978acc4d08b69dd972b5b05e008dd630 Mon Sep 17 00:00:00 2001
From: yuji38kwmt <yuji38kwmt@yahoo.co.jp>
Date: Thu, 12 Mar 2026 12:49:08 +0900
Subject: [PATCH] =?UTF-8?q?`write=5Fbinary=5Fimage`=20:=20RGBA=E3=83=A2?=
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---
 annofabapi/segmentation.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/annofabapi/segmentation.py b/annofabapi/segmentation.py
index b7bd0164..9750f1cb 100644
--- a/annofabapi/segmentation.py
+++ b/annofabapi/segmentation.py
@@ -33,4 +33,4 @@ def write_binary_image(array: npt.ArrayLike, fp) -> None:  # noqa: ANN001
     channel = 4  # RGBAの4チャンネル
     data = numpy.zeros((height, width, channel), dtype=numpy.uint8)
     data[mask_array] = [255, 255, 255, 255]
-    Image.fromarray(data, mode="RGBA").save(fp, format="PNG")
+    Image.fromarray(data).save(fp, format="PNG")