OpenCV implements BGR to RGB

1. Problems

When using the opencv function imread() to read a picture, the color order is BGR (blue, green, red), and the color order of Pillow is RGB, so we may need to convert BGR to RGB.

Two, conversion

BGR to RGB can be realized through the following methods

import cv2
import numpy as np
from PIL import Image

# 方法一
im_bgr = cv2.imread('data/src/lena.jpg')

im_rgb = im_bgr[:, :, [2, 1, 0]]
Image.fromarray(im_rgb).save('data/dst/lena_swap.jpg')

# 方法二
im_bgr = cv2.imread('data/src/lena.jpg')

im_rgb = im_bgr[:, :, ::-1]
Image.fromarray(im_rgb).save('data/dst/lena_swap_2.jpg')

# 方法三
im_cv = cv2.imread('data/src/lena.jpg')

im_rgb = cv2.cvtColor(im_cv, cv2.COLOR_BGR2RGB)
Image.fromarray(im_rgb).save('data/dst/lena_rgb_pillow.jpg')

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