python实现按长宽比缩放图片

Python  /  管理员 发布于 7年前   214

使用python按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

# -*- coding: utf-8 -*-from PIL import Imageclass 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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