Duotone Experiment

Grayscale (Layer 1): Brightness (Layer 1):

Layer 1 Filter:

Lightness (Layer 2): Chroma (Layer 2): Hue (Layer 2): Blend Mode (Layer 2): Normal Multiply Screen Overlay Darken Lighten Color Dodge Color Burn Hard Light Soft Light Difference Exclusion Hue Saturation Color Luminosity

Layer 2 Color:

Lightness (Layer 3): Chroma (Layer 3): Hue (Layer 3): Blend Mode (Layer 3): Normal Multiply Screen Overlay Darken Lighten Color Dodge Color Burn Hard Light Soft Light Difference Exclusion Hue Saturation Color Luminosity

Layer 3 Color: