How to use Python to convert pictures into comic style

Install OpenCV

First, we need to install OpenCV. OpenCV is an open source computer vision library that provides a wide variety of image processing tools that can be used in many different applications.

We can install OpenCV in Python using the following command: pip install opencv-python

Read the image and use edge detection

We need to read the image and use edge detection Algorithm to identify edges in images. This can be done through the Canny function in OpenCV. Example:

import cv2

img = cv2.imread('input.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
edges = cv2.Canny(gray, 100, 200)

The above code reads an image named input.jpg, converts it to a grayscale image, and then uses the Canny algorithm to detect edges. The edges variable will contain the detected edges.

Process the edges to generate a comic effect

Next, we need to process the edges to generate a comic effect. This can be done by converting the edges to black lines and adding a tint. Example:

# 转换为黑色线条
edges = cv2.cvtColor(edges, cv2.COLOR_GRAY2BGR)
edges[np.where((edges != [0, 0, 0]).all(axis=2))] = [0, 0, 255]

# 添加色调
color = cv2.bilateralFilter(img, 9, 300, 300)
cartoon = cv2.bitwise_and(color, edges)

The above code converts the edges to black lines and uses red as the color of the lines. Then, use the cv2.bilateralFilter function to add tint to the original image. Finally, edges and tones are merged to create a comic effect.

Save the comic effect picture

Finally, we can use the cv2.imwrite function to save the generated comic effect picture locally. Example:

cv2.imwrite('output.jpg', cartoon)

The above code saves the comic effect picture as output.jpg.

The complete code is as follows:

import cv2
import numpy as np

# 读取图片并进行边缘检测
img = cv2.imread('input.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
edges = cv2.Canny(gray, 100, 200)

# 对边缘进行处理以生成漫画效果
edges = cv2.cvtColor(edges, cv2.COLOR_GRAY2BGR)
edges[np.where((edges != [0, 0, 0]).all(axis=2))] = [0, 0, 255]
color = cv2.bilateralFilter(img, 9, 300, 300)
cartoon = cv2.bitwise_and(color, edges)

# 保存漫画效果图片
cv2.imwrite('output.jpg', cartoon)

The above code converts the picture named input.jpg into a comic effect, and saves the generated comic effect picture as output.jpg.

The effects generated by the comic effect will vary depending on the original image, so the parameters in the code may need to be fine-tuned to achieve the best effect. With constant experimentation and tweaking, you can use Python to transform your images into a unique comic book style.

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