When saving plots from Imatest IT and no display is connected or no graphics card is present the saved files are black with no content.
This problem can occur when using certain types of plot saving and no display is available to render the figure prior to saving. To solve this problem you can change the INI file setting that determines the format of saved plots. Some options will force the system to render the plot even if no display is present. If you are getting black figures, try changing the setting to one of the forced render settings.
INI setting: [section] … figsave = #;
This setting can appear in any section that has figures to save. Possible values of #:
Note: Settings 6, 7, and 8 result in a slightly different format to 1, 3, and 4.