图片转化为字符图

jupyter notebook 完成图片转化为字符图

from PIL import Image
ASCII_Char ="? " 
def RGB_Char(r,g,b,alpha=256):
    if alpha == 0:
        return
    length = len(ASCII_Char)
    gray = int(0.2126*r+0.7152*g+0.0722*b)#计算灰度
    unit=(256.0+1)/length
    idx = int(gray/unit)
    return ASCII_Char[idx]
def img2cahr(img,savepath):
    txt =" "
    width,height = img.size
    for i in range(height):
        line =" "
        for j in range(width):
            pos =(j,i)
            R,G,B ,A= img.getpixel(pos)
            line+=RGB_Char(R,G,B,A)
        txt =txt+line+"\n"
    #保存字符图
    with open(savepath,"w+",encoding="utf-8") as f:
        f.write(txt)
#预处理(将图片尺寸压缩，并转为灰度图)
def preprocess(img_path,delta =100):
    img =Image.open(img_path)
    width ,height =img.size
    width =width/2
    height =height/2
    if width>height:
        max =width
    else:
        max =height
    scale =max/delta
    width,height = int(width/scale),int(height/scale)
    img =img.resize((width,height))
    return img
img = preprocess("F:libowu.png")
img2cahr(img,"F:/wei/LIBOWU.txt")