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

def resize(png_path, base_width):
    img = Image.open(png_path)
    wpercent = (base_width / float(img.size[0]))
    hsize = int((float(img.size[1]) * float(wpercent)))
    resized_img = img.resize((base_width, hsize), Image.ANTIALIAS)
    return resized_img

def png_to_jpg(png_path, target_img):
    fill_color = None
    img = target_img
    jpg_path = png_path[:-4]+'.jpg'

    if img.mode in ('RGBA', 'LA'):
        background = Image.new(img.mode[:-1], img.size, fill_color)
        background.paste(img, img.split()[-1])
        img = background

    img.save(jpg_path, 'JPEG')

def resize_png2jpg(png_path, base_width):
    img = resize(png_path, base_width)
    png_to_jpg(png_path, img)

# 사용
resize_png2jpg("people.png", 1600)