Reference+
Name
mask()
Description
Masks part of an image from displaying by loading another image and
using it as an alpha channel. This mask image should only contain
grayscale data, but only the blue color channel is used. The mask image
needs to be the same size as the image to which it is applied.
In addition to using a mask image, an integer array containing the alpha
channel data can be specified directly. This method is useful for
creating dynamically generated alpha masks. This array must be of the
same length as the target image's pixels array and should contain only
grayscale data of values between 0‑255.
Syntax
mask(img)
Parameters
img
(PImage)
image to use as the mask
Return
void
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