1)
Duplicate the Background layer by dragging the layer to the copy .
2) Go to Image>Adjust>Invert, change the Blend Mode to Luminosity and reduce the Layer Opacity to 50%.
3) Duplicate Background Layer and place this layer on top of all Layers. Change the Blend Mode to Multiply.
4) Go to Image>Adjust>Threshold and move slider for info. Click OK.
* Move the slider back and forth to reveal image information.