Painting Away Color Tutorial

Step1:
Open the image you would like to work on.

Step2:
Click on the brush tool.
In the options bar.
Switch the Blend Mode to Color.
Change your foreground color to black.

Step3:
From the brushes palette, choose a medium sized, soft-edged (0%Hardness) brush

Step4:
Start paniting.
As you paint, the color will disappear leaving your image in grayscale.