from PIL import Image

def convert_png_with_alpha_to_png(png_path, output_png_path, background_color=(255, 255, 255)):
    png = Image.open(png_path)
    mode = png.mode
    png.load()
    background = Image.new("RGB", png.size, background_color)
    if 'A' in mode:
        background.paste(png, mask=png.split()[3])
    else:
        background.paste(png)
    background.save(output_png_path, 'PNG')




from PIL import Image

png = Image.open(object.logo.path)
png.load() # required for png.split()

background = Image.new("RGB", png.size, (255, 255, 255))
background.paste(png, mask=png.split()[3]) # 3 is the alpha channel

background.save('foo.jpg', 'JPEG', quality=80)