پردازش تصویر دیجیتال آغازین: استفاده از ابزارهای رایگان برای عکاسان (صدای کارشناسان در عکاسی دیجیتال)

Apress, 2010. — 301 p. — ISBN: 1430228415, 978-1430228417. Digital image post-processing and open-source software are exciting topics; this book is the fusion of both. How cool is that? After you read this book, you will be able to edit your images for free. This book starts with some background information about photography and digital images to give the reader a common base. Then, several image post-processing techniques are presented with ascending difficulty, from simple resizing or cropping to more advanced subjects such as high dynamic range (HDR) imaging, distortion correction, or panoramas. Armed with these techniques, using the best open-source tools available, you will be ready to start editing your images for free. In each case, I will show you the best free tools for the job. Finally, as an added bonus, the last two chapters cover extra stuff: video processing for creating your own movies from single video clips and CHDK to enhance your camera features. The first chapter of the book introduces general photography concepts. You will learn common concepts used in photography so that you can control your camera to take the shots that you want. Understanding these concepts is the key to shooting a good photo, which in turn is the starting point for image editing. The second chapter describes all the details of digital images. Because you are going to work with digital images, in-depth knowledge is beneficial before you start editing. The third chapter covers the simplest and most common post-processing techniques. Every photographer often needs to resize or crop their images so that they fit in the specific medium they want to present. All these operations and more are presented in this chapter. The fourth chapter explains how to control color in your images. Everything that you need to know is here. The fifth chapter covers the most commonly used filters in digital photography, such as noise reduction, blur, or the unsharp mask. The sixth chapter covers the photo retouching techniques that photographers use to fix images with small problems such as skin blemishes, removing small objects, and so forth. Chapter 7 covers a more advanced technique, HDR. You will learn how to create those images from ordinary pictures. Chapter 8 covers distortion correction. It shows you how to correct the distortion produced by perspective and lenses. In Chapter 9, you will understand how to take the images needed for making panoramas as well as how to create them. The last two chapters cover bonus material. Chapter 10 teaches you how to create movies from your video clips, and Chapter 11 describes how to use CHDK to enhance your camera’s features. I hope you enjoy this journey into open-source digital-image post-processing! Introduction Digital Photography Digital Images Geometric Transforms Color Transforms Filters Photo Retouching HDR Imaging Distortion Correction Panorama Photo Stitching Movie Editing Canon Hack Development Kit Installing the Tools

Since the advent of digital photography, we have been able to post-process our pictures. However, to do it properly, we have to become digital art apprentices. Sebastian Montabone is a computer vision expert who wants us to use our cameras and image processing software to come up with works of art. In this book, he teaches image processing techniques of ascending difficulty based on freely available tools. The book teaches you to use the best tools for the job, and it focuses on the techniques, not the environments or toolchains in which they run. Also in this book, you’ll learn about the Canon Hack Development Kit (CHDK), which expands the features of some cameras.

What you’ll learn

• Learn how to process your photos by example.
• Save money by using free tools instead of expensive commercial software.
• Create unbelievable high-dynamic range (HDR) pictures.
• Generate stunning panoramas from ordinary pictures.
• Use the Canon Hack Development Kit (CHDK) to expand your camera features.
• Make videos and edit them easily using free software.

Who this book is for

This book is for anyone who is interested in photography, image processing, or free image editing software, with no exceptions.

Table of Contents

1. Digital images
2. Geometric transforms
3. Color transforms
4. Filters
5. Photo retouching
6. HDR
7. Distortion correction
8. Panorama photo stitching
9. Movie editing
10. CHDK

Since the advent of digital photography, we have been able to post-process our pictures. However, to do it properly, we have to become digital art apprentices. Sebastian Montabone is a computer vision expert who wants us to use our cameras and image processing software to come up with works of art. In this book, he teaches image processing techniques of ascending difficulty based on freely available tools. The book teaches you to use the best tools for the job, and it focuses on the techniques, not the environments or toolchains in which they run. Several free and open source programs are covered such as GIMP, Hugin, Luminance HDR (formerly known as Qtpfsgui), UFraw, Imagemagick, exiftool, and avidemux. Also in this book, you'll learn about the Canon Hack Development Kit (CHDK), which expands the features of some cameras. What you'll learn Who this book is for This book is for anyone who is interested in photography, image processing, or free image editing software, with no exceptions.