Why is it not the original to convert raw into jpg format to send wechat?

Because wechat will compress pictures by default.

When raw is converted into jpg format and sent to wechat, wechat will compress the picture by default, and the sent picture is not the original picture. At this time, you need to send it on the send picture page of WeChat when sending it. Click on the original picture and send it again to send the compressed original picture of the bridge.

Raw image is the original data that CMOS or CCD image sensor converts the captured light source signal into digital signal.