Python PIL压缩二进制图像（PNG转JPG）

问题描述

压缩二进制图像（PNG转JPG）

1.png，69.7KB

解决方案

Image.save() 进 BytesIO 对象再读出来即可

from PIL import Image
from io import BytesIO

img = Image.open('1.png')
img = img.convert('RGB')
bytesIO = BytesIO()
img.save(bytesIO, format='JPEG', quality=75)  # 图像质量默认为75
img = bytesIO.getvalue()
with open('result.jpg', 'wb') as f:
    f.write(img)

result.jpg，6KB

封装

from PIL import Image
from io import BytesIO


def PIL_compress(im):
    '''PIL图像压缩

    :param im: PIL图像，PIL.Image
    :return: bytes图像
    '''
    bytesIO = BytesIO()
    im = im.convert('RGB')
    im.save(bytesIO, format='JPEG', quality=75)  # 图像质量默认为75
    return bytesIO.getvalue()


if __name__ == '__main__':
    img = Image.open('1.png')
    img = PIL_compress(img)
    with open('result.jpg', 'wb') as f:
        f.write(img)

参考文献

1. PIL.Image.Image.save
2. Python PIL和二进制图片互转