[Python] is it possible to extracting text inside colored background region using opencv in...

I having the following table area from the original image:



I'm trying extract the text,from this table.But when using threshold the whole gray regions get darkening.For example like below,



The threshold type which i did used,

thresh_value = cv2.threshold(original_gray, 128, 255, cv2.THRESH_BINARY_INV +cv2.THRESH_OTSU)[1]


is it possible to extract and change gray background into white and lets remain text pixel as it is if black then?

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