Based on this https://github.com/XScorpion2/Bitmap2OLED

bitmap2oled

from PIL import Image

def convertBitmap(filename):
    result = []
    bitmap = Image.open(filename)
    width = bitmap.width
    height = bitmap.height
    for y in range(0, height, 8):
        for x in range(0, width):
            col = 0
            for p in range(0, 8):
                pixel = bitmap.getpixel((x, y + p))
                value = 0
                if type(pixel) is tuple:
                    values = sum(pixel) / 3
                    value = 1 if values > 127 else 0
                else:
                    value = 1 if pixel == 255 else 0

                s = value << p
                col = col | s
            result.append(col)
    return (result, width, height)

def printResult(result, width, height):
    for y in range(0, int(height/8)):
            for p in range(0, 8, 2):
                    for x in range(0, width):
                        i = x + y * width;
                        b = result[i] >> p & 1;
                        b2 = result[i] >> (p + 1) & 1;
                        if (b == 0 and b2 == 0):
                            print(" ", end = '')
                        elif (b == 1 and b2 == 0):
                            print("▀", end = '')
                        elif (b == 0 and b2 == 1):
                            print("▄", end = '')
                        elif (b == 1 and b2 == 1):
                            print("█", end = '')
                    print("");

image = convertBitmap("smile-wide.bmp")
printResult(*image)
print(image[0])