2020-07-24 不给你的女朋友来张素描吗？使用python

本工具使用python编写，将彩色图片转成黑白素描手绘图。
在python源码里可以调节其参数，尽量调到最好的效果。
使用颜色鲜艳的图片效果更佳！！参考文章：http://www.askaswiss.com/2016/01/how-to-create-pencil-sketch-opencv-python.html

将图片转为素描主要有4个步骤：

• 首先将彩色图转换成灰度图；
• 对灰度图进行求其反色的操作；
• 对第2步得到的结果采用一个高斯模糊的操作；
• 采用颜色亮化(color dodge)的技术将第一步的灰度图和第三步操作后的图片进行混合。

主要使用的是opencv模块。

原图：

12321111-24787f45561b4404.jpg

素描图：

12321111-f8ec538fac43e5b2.jpg

源码：

# -*- coding:utf-8 -*-
 
 
import cv2
import numpy as np
from tkinter import filedialog, Tk
from os import getcwd
from re import findall
 
 
def open_path():
    # 图片路径
    root = Tk()
    root.withdraw()
    file_path = (filedialog.askopenfilename(title='选择图片文件', filetypes=[('All Files', '*')]))
    return file_path
 
 
def dodgeNaive(image, mask):
    # determine the shape of the input image
    width, height = image.shape[:2]
 
    # prepare output argument with same size as image
    blend = np.zeros((width, height), np.uint8)
 
    for col in range(width):
        for row in range(height):
            # do for every pixel
            if mask[col, row] == 255:
                # avoid division by zero
                blend[col, row] = 255
            else:
                # shift image pixel value by 8 bits
                # divide by the inverse of the mask
                tmp = (image[col, row] << 8) / (255 - mask)
                # print('tmp={}'.format(tmp.shape))
                # make sure resulting value stays within bounds
                if tmp.any() > 255:
                    tmp = 255
                    blend[col, row] = tmp
 
    return blend
 
 
def dodgeV2(image, mask):
    return cv2.divide(image, 255 - mask, scale=256)
 
 
def burnV2(image, mask):
    return 255 - cv2.divide(255 - image, 255 - mask, scale=256)
 
 
def rgb_to_sketch(src_image_name):
    print('转换中......')
    img_rgb = cv2.imread(src_image_name)
    img_gray = cv2.cvtColor(img_rgb, cv2.COLOR_BGR2GRAY)
    # 读取图片时直接转换操作
    # img_gray = cv2.imread('example.jpg', cv2.IMREAD_GRAYSCALE)
 
    img_gray_inv = 255 - img_gray
    img_blur = cv2.GaussianBlur(img_gray_inv, ksize=(21, 21),
                                sigmaX=0, sigmaY=0)
    img_blend = dodgeV2(img_gray, img_blur)
 
    # cv2.imshow('original', img_rgb)
    # cv2.imshow('gray', img_gray)
    # cv2.imshow('gray_inv', img_gray_inv)
    # cv2.imshow('gray_blur', img_blur)
    cv2.imwrite(dst_image_name, img_blend)
    save_path = getcwd() + "\\" + dst_image_name  # 保存路径
    print('转换完成!!!\n')
    print('保存路径:' + save_path)
    cv2.imshow(save_path, img_blend)
    cv2.waitKey(0)
    cv2.destroyAllWindows()
 
 
if __name__ == '__main__':
    print('请选择图片(路径不要含中文)：')
    src_image_name = open_path()  # 文件路径
    print(src_image_name+'\n')
    image_name = ''.join(findall(r'[^\\/:*?"<>|\r\n]+$', src_image_name))  # 获取文件名
    dst_image_name = 'Sketch_' + image_name
    rgb_to_sketch(src_image_name)

打包后exe蓝奏云下载地址：https://www.lanzous.com/ib1434d