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The purpose of this module is to introduce you to pixel-based image processing algorithms, similar to those that you might find in commercial image editing software such as Photoshop.

Table of contents

Preface

This module is one in a collection of modules designed to teach you about the Processing open source programming environment.

Processing is a Java-based OOP programming environment for people who want to create images, animations, and interactions.

The purpose of this module is to introduce you to pixel-based image processing algorithms, similar to those that you might find in commercial imageediting software such as Photoshop .

Click here to view the JavaScript version of the sketch discussed in this module in your HTML 5compatible browser.

Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the imagesand listings while you are reading about them.

Images

  • Image 1 . The raw image displayed in an image explorer.
  • Image 2 . The modified image displayed in an image explorer.

Listings

Preview

The program that I will explain in this module is designed to be used as a preliminary test of the student's understanding of programming using Java and Processing Development Environment (PDE) .

If this were a real test, the student would be provided an image file named Pr0130a.jpg along with a pair of stand-alone Processing applications. Those applications would produce the raw image and a modifiedversion of the raw image, each in an image explorer, as shown in Image 1 and Image 2 . (Click here to view the modified image version of the sketch in your HTML 5 compatiblebrowser.)

Deduce the algorithm

The first requirement would be for the student to examine the raw image shown in the image explorer window in Image 1 and to deduce the algorithm required to transform that image into the modified image shown inthe image explorer window in Image 2 .

Implement the algorithm

The second requirement would be for the student to implement the algorithm once it is established. Among other things, this would require that thestudent be able to:

  • Load an image from an image file.
  • Modify the pixels in the image according to the algorithm.
  • Write one sketch to display the raw image in an image explorer window before it is modified.
  • Write another sketch to display the modified image in another image explorer window after it is modified.

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Source:  OpenStax, The processing programming environment. OpenStax CNX. Feb 26, 2013 Download for free at http://cnx.org/content/col11492/1.5
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