From 0ce985ccdbc514c5e43b4b15258bc51397d0f5fb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BE=A1=E5=9D=82=E6=98=B4?= <gugugulaocuchen@gmail.com>
Date: Tue, 10 Sep 2024 11:38:30 +0800
Subject: [PATCH] =?UTF-8?q?=E5=88=9D=E6=AD=A5=E5=AE=8C=E6=88=90=E7=AC=AC?=
 =?UTF-8?q?=E4=BA=8C=E9=81=93=E9=A2=98?=
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---
 test/2024,9,10/set_alpha.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 test/2024,9,10/set_alpha.py

diff --git a/test/2024,9,10/set_alpha.py b/test/2024,9,10/set_alpha.py
new file mode 100644
index 0000000..24227a3
--- /dev/null
+++ b/test/2024,9,10/set_alpha.py
@@ -0,0 +1,16 @@
+import cv2 as cv
+
+# read image
+img=cv.imread("opencv_logo.png",cv.IMREAD_UNCHANGED)
+# concert to rgba
+img_rgba=cv.cvtColor(img,cv.COLOR_BGR2BGRA)
+# split alpha channel
+blue,green,red,alpha = cv.split(img_rgba)
+#set alpha channel
+alpha[int(alpha.shape[0]/2):alpha.shape[0],int(alpha.shape[1]/2):alpha.shape[1]]=0
+# remix alpha to img_rgba
+img_rgba=cv.merge((blue,green,red,alpha))
+# show
+cv.imshow("changed",img_rgba)
+cv.waitKey(0)
+cv.destroyAllWindows()
\ No newline at end of file