increase dpi in figure files

Dear Stata friends, how to increase dpi in figure files?

The journal requires 300-600dpi JPEG/Tif figure files.

I can only produce 96dpi files from -graph export-. My procedure was like this:

sysuse auto, clear
hist mpg
graph export g1.jpg, replace // also tried options width quality
graph export g2.tif, replace // also tried options width quality

In File Explore, the Property>Details of the exported files show that
Horizontal resolution 96dpi
Vertical resolution 96dpi

Help please! Thank you in advance for your time.