How to change the HSV values of an image in python?

Question

I am able to convert an image from the RGB to HSV colorspace, but how can I then manipulate those values using the HSV scale as outlined in the PIL documentation ?

img = Image.open("assets/image.png")
img = img.convert('HSV')
img.show()

Answer 1

You can convert the image to a NumPy array and manipulate it from there.

For example, to shift the hue:

import numpy as np
from PIL import image

def hue_shift(img, amount):
    hsv_img = img.convert('HSV')
    hsv = np.array(hsv_img)
    hsv[..., 0] = (hsv[..., 0]+amount) % 360
    new_img = Image.fromarray(hsv, 'HSV')
    return new_img.convert('RGB')

Answer 2

If you get HSV images, you can use opencv library.

import argparse.
import cv2
ap = argparse.ArgumentParser()
ap.add_argument("-i", "-image", required = True, help = "Path to the image");
args = vars(ap.parse_args());
image = cv2.imread(args["image"]);
hsv = cv2.cvtColor(image, cv2.COLOR_RGB2HSV)