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Questions about image intensity with java 2d

chinedu iroanyah
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Good day all,
I am working on a project that involves image processing using java, but I am faced with some challenges. please i would glad if someone could help me with answers to these questions:

1) What is image intensity

2) if i have seperate 2 dimensional arrays for the alpha, red, green, blue for each pixel of an image, or a 2 dimensional array of the rbg value of each pixel in an image, how can i calculate the intensity and/or average intensity of the image from these.
With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.
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