Implement the Image Resize and Grayscale Features

Introduction

In the previous lessons, we implemented the functions to upload, save, rotate, and flip an image. In this lesson, we'll be implementing functions to resize an image and grayscale an image. Let's move on to the implementation.

Function to resize an image

Below is an illustration of the logic of resizing the pixel values of an image. Suppose that we have an image with $3\times 3$ pixels, and we want to resize the image to $4\times 4$ ...