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How to convert image to grayscale?

How can I convert an image to grayscale? I've got a numpy array of the image and what is the way to convert it? Is there a formula for it?

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2 Answers

You can use OpenCV function to convert image to grayscale.

import cv2

img = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY)  # or cv2.COLOR_BGR2GRAY

This is more accurate mode and is simple.


If you want to use the formula, the take a look at the this.


This is one of the ways to convert RGB image to grayscale. It kind of computes the average from the channels. There are different approaches. Here is a link for more details https://en.wikipedia.org/wiki/Grayscale

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