Hello Guys
Sorry, it seems very basic question but can’t find a log file 
Besides I try to run gmic from powershell, so i wonder if the only way to activate log file is by opening gmic with gimp and set the variable inside.
Thanks
Fransua
Ok I have found the answer.
C:\Users\fransua\AppData\Roaming\gmic
File is : gmic_qt_log
But Log is only when I run from gimp. Is there a way to pass argument while running outside ?
When running from a shell, you just have to redirect the error output stderr to a file, to get the log.
On linux, this is as simple as:
$ gmic do something here >& log_file.txt
With powershell, I can’t help (never used it), but I imagine there is something equivalent.
A very detailed output can be activated in G’MIC with the debug options, but this is really really verbose and probably not much of interest.