#37 Add Fill/Adjustment Layers

[Sam Richards]

Photoshop has this terrific extension to layers called
"Fill and Adjustment Layers"
This is a simple way to create a layer that:
A: Is procedurally filled with a flat color, a gradient
or pattern.

B: Is a color correction, e.g.:
levels, saturation, curves, color balance,
brightness/contrast, hue/saturation, selective color,
channel mixer, gradient map, invert, threshold, posterize

For the color corrections, this is simply applied to
all the layers below it. The great thing about it is
that its easy to switch off.