%% Set Mapping of Alpha Data into Alphamap
% Create an image. Vary the transparency across the image based on the color values. By default, the image clamps the transparency values between 0 and 1. Values less than 0 are completely transparency and values greater than 1 are completely opaque. Instead, transform the transparency values to span the alphamap using the alpha scaled command.

imagesc(peaks)
alpha color
alpha scaled

% Copyright 2015 The MathWorks, Inc.