Question

how to write a filter function where we have to alter the amount of RGB values

Answer 1

Firstly import PIL and then perform actions. You can use the PIL library.

syntax for filter function : filter(function,sequence)

Function tests if each element of sequence is true or not.

The sequence will be the elements.

So, here we have to write the function that alters the amount of RGB values.

Suppose if we want to reduce the size of every pixel by half, then we can use:

import PIL

img=PIL.Image.open("example.jpg")

img[row,col]={r,g,b}        #Here we can give the values of rgb for the image.

res=filter(lambda x : x * .5,img)

print(res)

So this filter function lets you know whether the image rgb values is reduced to half or not.