python实现按长宽比缩放图片

时间:2022-10-11 13:29:45

使用python图片固定长宽比缩放图片到指定图片大小,空白部分填充为黑色。

代码

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# -*- coding: utf-8 -*-
 
from PIL import Image
 
class image_aspect():
 
 def __init__(self, image_file, aspect_width, aspect_height):
  self.img = Image.open(image_file)
  self.aspect_width = aspect_width
  self.aspect_height = aspect_height
  self.result_image = None
 
 def change_aspect_rate(self):
  img_width = self.img.size[0]
  img_height = self.img.size[1]
 
  if (img_width / img_height) > (self.aspect_width / self.aspect_height):
   rate = self.aspect_width / img_width
  else:
   rate = self.aspect_height / img_height
 
  rate = round(rate, 1)
  print(rate)
  self.img = self.img.resize((int(img_width * rate), int(img_height * rate)))
  return self
 
 def past_background(self):
  self.result_image = Image.new("RGB", [self.aspect_width, self.aspect_height], (0, 0, 0, 255))
  self.result_image.paste(self.img, (int((self.aspect_width - self.img.size[0]) / 2), int((self.aspect_height - self.img.size[1]) / 2)))
  return self
 
 def save_result(self, file_name):
  self.result_image.save(file_name)
 
 
if __name__ == "__main__":
 image_aspect("./source/test.jpg", 1920, 1080).change_aspect_rate().past_background().save_result("./target/test.jpg")

感言

有兴趣的朋友可以将图片路径,长宽值,背景颜色等参数化
封装成api做为个公共服务

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