Blending allows you to provide a general transparency blend for your area selections, most often used for the following compose operators:
Blending is off when it is set to Flat ⇳ , Amplitude is all the way to the right, and Floor is all the way to the left:
Conical ⇳ blends to a sharp peak along both axes.
Flat ⇳ blends evenly across the area selection on both axes.
Maximum Axis ⇳ blends along a circular curve to the extent of the larger axis, along both axes.
Sine ⇳ blends along a sine curve on both axes.
Here are examples of blending off ( Flat ⇳ , Amplitude = 100%), and Maximum Axis ⇳ with Amplitude = 100%:
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