Convert opencv image format to PIL image format?

Question

I want to convert an image loaded

TestPicture = cv2.imread("flowers.jpg")

I would like to run a PIL filter like on the example with

Answer 1

Pillow and OpenCV use different formats of images. So you can't just read an image in Pillow and manipulate it into an OpenCV image. Pillow uses the RGB format as @ZdaR highlighted, and OpenCV uses the BGR format. So, you need a converter to convert from one format to another.

To convert from PIL image to OpenCV use:

import cv2
import numpy as np
from PIL import Image

pil_image=Image.open("demo2.jpg") # open image using PIL

# use numpy to convert the pil_image into a numpy array
numpy_image=numpy.array(pil_img)  

# convert to a openCV2 image, notice the COLOR_RGB2BGR which means that 
# the color is converted from RGB to BGR format
opencv_image=cv2.cvtColor(numpy_image, cv2.COLOR_RGB2BGR) 

To convert from OpenCV image to PIL image use:

import cv2
import numpy as np
from PIL import Image

opencv_image=cv2.imread("demo2.jpg") # open image using openCV2

# convert from openCV2 to PIL. Notice the COLOR_BGR2RGB which means that 
# the color is converted from BGR to RGB
color_coverted = cv2.cvtColor(opencv_image, cv2.COLOR_BGR2RGB)
pil_image=Image.fromarray(color_coverted)