How does Sony a73 set the gray patch?

Sony a73 is equipped with grey chips as follows.

In the picture configuration file in the menu, select pp7 as SLOG2 and PP9 as slog3, which is what people often say. Because log compresses the bright parts, gamma 2.2 compresses mostly the dark parts. However, the human eye is sensitive to dark details, especially the light and shade near the middle gray level, which makes log save more details and is more suitable for color matching.

Because video is not like photos, it is more convenient to process RAW files directly. The original video data is too large, so it must be "redundant" and converted into log. Logs are logarithmic documents. You can imagine it as a computer colorist. According to the value of Log, in the process of converting the original data of the image sensor into video, color should be done first on the premise of preserving the details of the picture.

Why use gray log mode:

First of all, why shoot video in log mode? Because for users who can do post-production, log video is a measure to improve the image quality. We have always told you that shooting video in log mode can increase the details of bright and dark parts, so you can bring up a clearer and richer picture later.

Although log video can retain more details than ordinary video, it is only a transitional video, and the contrast and saturation of the picture converted from log will be reduced, and the picture is not very pleasing to the eye.