Fig. 2: Different light conditions for optical microscopy to attain inkjet-printed line image dataset.
From: Image-based impedance spectroscopy for printed electronics

a Optical microscopy of inkjet-printed line using top and bottom light sources. b Top-center light source. c Top-side light source. d Top-ring light source. e Bottom light source. The other light sources are the combinations of the aforementioned light sources. f Top-center and bottom light source. g Top-side and bottom light source. h Top-ring and bottom light source.