cv2.error: (-215:Assertion failed) encoder-＞isFormatSupported(CV

OpenCV报错

cv2.error: OpenCV(4.5.1) /private/var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/pip-req-build-39p1qqfs/opencv/modules/imgcodecs/src/loadsave.cpp:694: error: (-215:Assertion failed) encoder->isFormatSupported(CV_8U) in function ‘imwrite_’

1. 首先检查路径是否有误
2. 检查图片类型，如，对于exr后缀的图片，float64无法保存

解决方案：

img = img.astype(np.float32)