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Sharing the source code where it gives an error will help to identify the problem.!

But as the error says "could not find a writer for the specified extension in function imwrite_", I expect that you might not have given the type of image in the imwrite (for instance .png or .jpg) this tells imwrite how to save the image.

Sharing the source code where it gives an error will help to identify the problem.!

But as from the error says "could not find a writer for the specified extension in function imwrite_", I expect that you might not have given the type of image in the imwrite (for instance .png or .jpg) this tells imwrite how to save the image.