前言

昨晚终于把红底换成蓝底了，刚想着兴高采烈地去提交，结果发现201KB交不了… 学院要求(60KB~200KB), 我人傻了，看了一下wps, 啊充钱才可以。

压缩图片

# 代码参考自 https://blog..net/weixin_34910922/article/details/117537384
import cv2


def compress_pic(origin_img_fp, save_img_fp, compression):

    # IMWRITE_JPEG_QUALITY会比IMWRITE_PNG_COMPRESSION压缩比率低一些
    quality = cv2.IMWRITE_JPEG_QUALITY
    assert 0 <= compression <= 100, please make sure 0 <= compression <= 100
    if origin_img_fp.split(.)[-1] == png:
        # 越小照片越大
        quality = cv2.IMWRITE_PNG_COMPRESSION
        assert 0 <= compression <= 10, please make sure 0 <= compression <= 10
    
    img = cv2.imread(origin_img_fp)
    cv2.imwrite(save_img_fp.format(compression), img, [quality, compression])
    print(压缩成功, save_img_fp.format(compression))


if __name__ == __main__:
    origin_img_path = pic/my_640_480.png
    save_img_path = pic/my_640_480_compression_{}.png
    compress_pic(origin_img_path, save_img_path, 8)

png格式下可以发现, compression参数设置的越小图片的大小越大。

图片格式转换

上去一看，学院要求jpg格式，真实纯纯大冤种… 我用画图去另存为jpg图片，结果太小了，只有35KB 还是用python写个png转jpg吧。 quality 默认是75，但是压缩率太大了。所以我把quality调大了些。

from PIL import Image


im = Image.open(pic/my_640_480.png)
im = im.convert(RGB)
im.save(pic/my_640_480.jpg, quality=100)

最后转完86KB。