This primitive is suitable for UFTI, IRCAM, and Michelle in imaging mode.

Processing only occurs for object and sky frames.

The dark-subtracted image can be displayed.

The subtraction assumes the same exposure time for the dark and object frame. That validation should be done by the $Cal-$>$dark method.

The frame title is propagated.

Dark-subtracted frame inheriting the frame’s name but with the _dk suffix.