A few command line features are
recently implemented in VESTA itself but not documented yet.
On Linux and Windows, you can use the following command.
VESTA -open file1.cif -export_img scale=2 file1.png
If "sacle" option is omitted, the default scale is 1.
On macOS, the app bundle should be called through the "open"
command;
open -n -a VESTA.app --args -open file1.cif -export_img scale=2
file1.png
In pp.22-25 of the following slides you can check other command
currently implemented.
https://www.rs.tus.ac.jp/hypermaterials/activity/documents/Hyper_Material20.05.28_Momma.pdf
Best regards,
Koichi