Python - draw text on image and image to numpy array

目標

嘗試生成以微軟正黑體寫成的數字0~9並轉換成 numpy array

本文包含

• 生成圖片和保存圖片
• 在圖片上寫出指定字型和大小的字
• 設定反鋸齒模式
• 圖片轉成 numpy array

程式碼

import numpy
from PIL import Image
from PIL import ImageFont
from PIL import ImageDraw

image_size = (8,13)
font_size = 10

for i in range(10):
    # 空白圖片生成
    image = Image.new('L', image_size, 0)

    # 取得繪圖器
    draw = ImageDraw.Draw(image)

    # 微軟正黑體
    font = ImageFont.truetype("C:/Windows/Fonts/msjh.ttc", font_size)

    # 關閉反鋸齒
    draw.fontmode = '1'

    # 測量文字尺寸
    text_size = draw.textsize(str(i),font)
    # print('text_size:', text_size)

    # 文字置中
    text_position = ((image_size[0]-text_size[0])//2,(image_size[1]-text_size[1])//2)
    # print('text_position:', text_position)

    # 畫上文字
    draw.text(text_position, str(i), 255, font)

    # 存檔
    image.save(str(i)+'.bmp')

    # 轉成 numpy array
    na = numpy.array(image.getdata()).reshape(image.size[1], image.size[0])

    # 印出
    print(na)

輸出

Using TensorFlow backend.
[[  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0 255 255 255 255   0   0]
 [  0   0 255   0   0 255 255   0]
 [  0 255   0   0   0   0 255   0]
 [  0 255   0   0   0   0 255   0]
 [  0 255   0   0   0   0 255   0]
 [  0 255   0   0   0   0 255   0]
 [  0 255 255   0   0 255   0   0]
 [  0   0 255 255 255 255   0   0]
 [  0   0   0   0   0   0   0   0]]
[[  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0 255 255   0   0   0]
 [  0   0 255 255 255   0   0   0]
 [  0   0   0   0 255   0   0   0]
 [  0   0   0   0 255   0   0   0]
 [  0   0   0   0 255   0   0   0]
 [  0   0   0   0 255   0   0   0]
 [  0   0   0   0 255   0   0   0]
 [  0   0 255 255 255 255 255   0]
 [  0   0   0   0   0   0   0   0]]
[[  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0 255 255 255   0   0]
 [  0   0 255   0   0   0 255   0]
 [  0   0   0   0   0   0 255   0]
 [  0   0   0   0   0   0 255   0]
 [  0   0   0   0   0 255   0   0]
 [  0   0   0   0 255   0   0   0]
 [  0   0   0 255   0   0   0   0]
 [  0   0 255 255 255 255 255   0]
 [  0   0   0   0   0   0   0   0]]
[[  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0 255 255   0   0   0]
 [  0   0 255   0   0 255   0   0]
 [  0   0   0   0   0 255   0   0]
 [  0   0   0 255 255   0   0   0]
 [  0   0   0   0   0 255   0   0]
 [  0   0   0   0   0 255   0   0]
 [  0   0 255   0   0 255   0   0]
 [  0   0 255 255 255   0   0   0]
 [  0   0   0   0   0   0   0   0]]
[[  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0 255 255   0   0]
 [  0   0   0   0 255 255   0   0]
 [  0   0   0 255   0 255   0   0]
 [  0   0 255   0   0 255   0   0]
 [  0 255   0   0   0 255   0   0]
 [  0 255 255 255 255 255 255   0]
 [  0   0   0   0   0 255   0   0]
 [  0   0   0   0   0 255   0   0]
 [  0   0   0   0   0   0   0   0]]
[[  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0 255 255 255 255   0   0]
 [  0   0 255   0   0   0   0   0]
 [  0   0 255   0   0   0   0   0]
 [  0   0 255 255 255   0   0   0]
 [  0   0   0   0   0 255   0   0]
 [  0   0   0   0   0 255   0   0]
 [  0   0 255   0   0 255   0   0]
 [  0   0 255 255 255   0   0   0]
 [  0   0   0   0   0   0   0   0]]
[[  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0 255 255 255   0]
 [  0   0   0 255   0   0   0   0]
 [  0   0 255   0   0   0   0   0]
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 [  0   0 255 255   0   0 255   0]
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 [  0   0 255   0   0   0 255   0]
 [  0   0   0 255 255 255   0   0]
 [  0   0   0   0   0   0   0   0]]
[[  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0 255 255 255 255 255 255   0]
 [  0   0   0   0   0 255   0   0]
 [  0   0   0   0   0 255   0   0]
 [  0   0   0   0 255   0   0   0]
 [  0   0   0   0 255   0   0   0]
 [  0   0   0 255   0   0   0   0]
 [  0   0   0 255   0   0   0   0]
 [  0   0 255   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]]
[[  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0 255 255   0   0   0]
 [  0   0 255   0   0 255   0   0]
 [  0   0 255   0   0 255   0   0]
 [  0   0   0 255 255   0   0   0]
 [  0   0   0 255   0 255   0   0]
 [  0   0 255   0   0   0 255   0]
 [  0   0 255   0   0   0 255   0]
 [  0   0   0 255 255 255   0   0]
 [  0   0   0   0   0   0   0   0]]
[[  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0   0   0   0   0   0]
 [  0   0   0 255 255 255   0   0]
 [  0   0 255   0   0   0 255   0]
 [  0   0 255   0   0   0 255   0]
 [  0   0 255   0   0   0 255   0]
 [  0   0   0 255 255 255 255   0]
 [  0   0   0   0   0   0 255   0]
 [  0   0   0   0   0 255   0   0]
 [  0   0 255 255 255   0   0   0]
 [  0   0   0   0   0   0   0   0]]

參考文件

PIL影像相關:http://pillow.readthedocs.io/en/stable/reference/index.html