Matlab Addition and Subtraction of Images : Part 1

Image processing is a form of signal processing in which the input is an image, such as a photograph, the output of image processing may be either an image or a set of characteristics or parameters related to the image. Most image-processing techniques involve treating the image as a two-dimensional signal and applying standard signal-processing techniques to it.
In this video i have tried to explain you basic commands of matlab helpful in image processing aiding in writing, subtraction and various forms while processing an image.

For Matlab File:
For Part II
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[ethiopiansickness]

why did you use the imwrite? why did you change it form .tif to png?