自问自答， 因为opencv读图建立的矩阵的data type是 uint8 然後numpy 建立的array的data type是 float 所以只要补上一行 img2 = img2.astype(float) 将opencv读图建立的矩阵data type改成float即可。 ※ 引述《PHONm (USA~USA)》之铭言： : opencv手册中 1.3.2 Arithmetic Operations on Images : 范例 : import cv2 : import numpy as np : img2 = cv2.imread('opencv_logo.png',1) : img1 = np.zeros(img2.shape)+100 img2 = img2.astype(float) : #(书上范例是另一个图，我找不到就开一个大小一样的矩阵) : dst = cv2.addWeighted(img1,0.3,img2,0.7,0) : cv2.imshow('dst',dst) : cv2.waitKey(0) : cv2.destroyAllWindows() : 然後会产生下列Error，请问是甚麽原因呢? : OpenCV Error: Bad argument (When the input arrays in : add/subtract/multiply/divide functions have different types, the output array : type must be explicitly specified) in cv::arithm_op, file : D:\library\opencv3.1\sources\modules\core\src\arithm.cpp, line 663 : Traceback (most recent call last): : File : "C:/Users/cash.chien/PycharmProjects/OpenCVParactice/Basic_Operations_on_Images.py", : line 7, in <module> : dst = cv2.addWeighted(img1,0.3,img2,0.7,0) : cv2.error: D:\library\opencv3.1\sources\modules\core\src\arithm.cpp:663: : error: (-5) When the input arrays in add/subtract/multiply/divide functions : have different types, the output array type must be explicitly specified in : function cv::arithm_op --

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