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cv2.error: OpenCV(4.9.0) D:\a\opencv-python\opencv-python\opencv\modules\imgcodecs\src\loadsave.cpp:696: error: (-2:Unspecified error) could not find a writer for the specified extension in function 'cv::imwrite_'

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エラー内容の共有

circle.py
import numpy as np
import cv2

img = np.zeros((400,400,3), np.uint8)
cv2.circle(img, (200, 200), 50, (255, 0, 0), 1)
cv2.imwrite(r'C:\Users\tmasa\OpenCV4_Programming_Getting_Started_in_Python\circle1.img', img)
cv2.imshow('img1',img)

これの実行時にエラーが出ました。

解決方法

拡張子が.imgになってました。.pngですね…

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