Gray Scale:
Obtained through image>mode>grayscale removes all color values from pixels in the picture.
Desaturation:
Obtained through image>mode>desaturate reduced the intensity of color in all pixels.
Monotone:
Obtained by gray scaling the original then to image>mode>duocolor and then choosing a color to represent gray in the scaling.
Channel Mixer:
Obtained by creating a mask layer over the original and adjusting the color on the layer’s channels.
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