How to turn off caution messages when compressing images with low quality

[LinZhineng]

Dear,
I compressed images with low quality such as 10, and I received a caution message "Caution: quantization tables are too coarse for baseline JPEG". I want to close this information, I checked the source code from the "..torch/install/share/lua/5.1/image" and "..torch/install/lib/luarocks/rocks/image", but did not locate the code.
I installed the "image" package in the way of "luarocks install image"
may you help me? any idea?

many thanks and best regards,