Page 493 - ProShow Producer 9 Final Manual
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492 16. Masks & Adjustment Layers
Remember, the rule for a Grayscale Adjustment is "light reveals, dark
conceals". With the sample adjustment layer you just created, the lighter
portion of the gradient layer is what will be affected by the color change
you just made. The darker portion won't be affected at all as 'dark
conceals'.
Preview the slide again and you'll see that you have now colorized only the
top part of the image -that part of the image that is underneath the white
portion of the gradient in Layer 1.