How can ios upload pictures more clearly?

our company has high requirements for the quality of the uploaded pictures, which should reach the level of Wechat"s moments.
I use AFNetworking upload, adjust the image compression ratio, still can not meet the requirements of the company.

how can I make the picture clearer?
solve

Ios
Mar.07,2021

do not compress the picture. Upload the original picture directly. If the original picture is not clear, it will not be clear at all.

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MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e4c743-44eb6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e4c743-44eb6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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