python擴展庫，python自帶的PIL庫擴展圖片大小給圖片加上文字描述

　　利用python自帶的PIL庫擴展圖片大小給圖片加上文字描述。大多都是庫函數調用，只是給定圖片寬度后計算文字所需行數的代碼需要寫。 代碼比較丑，but it works.

#!/usr/bin/env python3from PIL import Image, ImageDraw, ImageFont
import mathtext="盡管曾作為皇家獵場而存在，意大利大帕拉迪索國家公園一直保留著其野性的一面。畫面里的赤狐靜靜地匍匐在秋草叢中等待時機，它的身軀與自然融為一體。所有狐貍都是機會主義者，生活在大帕拉迪索的赤狐也不例外；如果有可能，無論是魚類還是野兔，即便是人類野餐留下的殘羹冷炙，它們也不介意吃個一干二凈。"def make_text_image(width, white, text, save_path, mode = "rgb"):"""生成一個文字圖形, white=1，表示白底黑字，否則為黑底白字"""# 字體可能要改# linux查看支持的漢字字體 # fc-list :lang=zhft = ImageFont.truetype("DroidSansFallbackFull.ttf", 15)w, h = ft.getsize(text)# 計算要幾行lines = math.ceil(w / width) + 1height = h * lines# 一個漢字的寬度one_zh_width, h = ft.getsize("中")if len(mode) == 1:  # L, 1background = (255)color = (0)if len(mode) == 3:  # RGBbackground = (255, 255, 255)color = (0,0,0)if len(mode) == 4:  # RGBA, CMYKbackground = (255, 255, 255, 255)color = (0,0,0,0)newImage = Image.new(mode, (width, height), background if white else color)draw = ImageDraw.Draw(newImage)# 分割行text = text + " " #處理最后少一個字問題text_list = []start = 0end = len(text) - 1while start < end:for n in range(end):try_text = text[start:start+n]w,h = ft.getsize(try_text)if w + 2*one_zh_width > width:breaktext_list.append(try_text[0:-1])start = start + n - 1;# print(text_list)i = 0for t in text_list: draw.text((one_zh_width, i * h), t, color if white else background, font=ft)i = i + 1newImage.save(save_path);def resize_canvas(org_image="aa.jpg", add_image="222.jpg", new_image_path="save2.jpg"):org_im = Image.open(org_image)org_width, org_height = org_im.sizemode = org_im.modemake_text_image(org_width, 0, text, "222.jpg", mode)add_im = Image.open(add_image)add_width, add_height = add_im.sizemode = org_im.modenewImage = Image.new(mode, (org_width, org_height + add_height))newImage.paste(org_im, (0, 0, org_width, org_height))newImage.paste(add_im, (0, org_height, add_width, add_height + org_height))newImage.save(new_image_path)resize_canvas()

原圖

改之后的圖

參考資料：
PIL庫幫助文檔http://pillow.readthedocs.io/en/latest/reference/ImageFont.html?highlight=getsize
加水印的學習 https://wanglu.info/1273.html
擴展圖片大小的學習 https://ask.helplib.com/1334235
計算字符串像素的學習 http://blog.csdn.net/icamera0/article/details/50762050