can't solve the problem of image's lightness 无法解决图像的亮度问题

[Linzh7]

hello, i cant improve the lightness by using the method in README. i mean, i have tried this: sensor.reset() … sensor.skip_frames(time = <时间(单位ms)越长越亮，一般在100-2000之间>) sensor.set_auto_gain(False) this, sensor.set_framerate(N<<11) ，建议N的取值为1-7（不要设为0！），此时，像素时钟频率为 96MHz / (N+1)， however, the problem still here.

the image is like: in the same place, this is the photo i took by smartphone:

And i wonder, what could i do next.

您好，我无法按README中所述方法提升亮度。 我尝试过以上的方法，但结果并未得到改善。 请问我应该继续作何尝试？