Among the most useful tools in the image-processing repertoire are those that generate a new pixel value based on the relationship between the value of a given pixel and the values of those that surround it. This chapter and the next describe image processing with "neighborhood" operations—that is, processes that involve the pixel's immediate (and not-so-immediate) neighbors.
This chapter focuses mainly on convolutions—operations in which new pixel values result from linear combinations (i.e., addition and multiplication) of a pixel with its neighbors. Chapter 15 deals with neighborhood operations in which the new values result from nonlinear operations (such as sorting) on the neighboring pixels.
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Adobe Photoshop can be a complex tool only because you can do so much with it, however for in this video series, we're going to keep it as simple as possible. In fact, in this video you'll see an overview of the few tools and Adobe Photoshop features we will use. When you see this video, you'll see how you can do so much with so few features, but you'll learn how to use them in depth in the future videos.