GIMP 2.8 for Photographers

GIMP 2.8 for Photographers

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English
401 Pages

Description

Image editing is a crucial element in the photographic workflow. Image editing tools, most notably Photoshop, are usually sophisticated and deep applications, and are fairly expensive. The only open source tool in this market is the GIMP, which has developed into a powerful, multiplatform system running on Linux, Mac OS X, and Microsoft Windows.

GIMP 2.8 for Photographers is a beginner's guide to the only open source image editing tool that provides a no-cost alternative to expensive programs such as Photoshop. Topics include the new user interface and tools, the basics of image editing and simple adjustments, advanced techniques using layers and masks, developing RAW images, working with the improved text tool, and preparing high-quality black-and-white images. The most important editing functions are presented in individual, easy-to-follow workshops. A bonus section on the included DVD describes special techniques for web graphics.

GIMP 2.8 for Photographers has evolved from classroom materials that the author developed and taught in courses and workshops on image editing with the GIMP.


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Published by
Published 15 May 2013
Reads 21
EAN13 9781457181917
Language English
Document size 92 MB

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GIMP 2.8 for Photographers Image Editing with Open Source Software
GIMP 2.8 DVD
The content of the DVD that accompanies this book can be downloaded at:http://www.rockynook.com/GIMP2.8-DVD
Your Rocky Nook Team
Klaus Goelker
GIMP 2.8 for Photographers Image Editing with Open Source Software
Klaus Goelker, klaus@goelker.com Editor: Gerhard Rossbach Copyeditor: Beth Bernstein/Judy Flynn Proofreader: Aimee Baldridge Translator: Jeremy Cloot Layout: Jan Martí, Command Z Cover Design: Helmut Kraus, www.exclam.de Printer: Everbest Printed in China
ISBN 978-1-937538-26-2 1st Edition 2013 © 2013 by Klaus Goelker Rocky Nook Inc. 802 East Cota St., 3rd Floor Santa Barbara, CA 93103 www.rockynook.com
Copyright © 2012 by dpunkt.verlag GmbH, Heidelberg, Germany. Title of the German original: Fotobearbeitung und Bildgestaltung mit GIMP 2.8 ISBN 978-3-89864-766-3 Translation Copyright © 2013 by Rocky Nook. All rights reserved.  Library of Congress Cataloging-in-Publication Data Goelker, Klaus. [Fotobearbeitung und Bildgestaltung mit GIMP 2.8] Gimp 2.8 for photographers : image editing with open source software / by Klaus Goelker. -- 1st edition.  pages cm ISBN 978-1-937538-26-2 (pbk.) 1. GIMP (Computer file) 2. Photography--Digital techniques. 3. Image processing--Digital techniques. I. Title. TR267.5.G56G644413 2013 770.28553--dc23  2012047191 Distributed by O‘Reilly Media 1005 Gravenstein Highway North Sebastopol, CA 95472
All rights reserved. No part of the material protected by this copyright notice may be reproduced or utilized in any form, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, with-out written permission of the publisher.
Many of the designations in this book used by manufacturers and sellers to distinguish their products are claimed as trademarks of their respective companies. Where those designations appear in this book, and Rocky Nook was aware of a trademark claim, the designations have been printed in caps or initial caps. All product names and services identi-fied throughout this book are used in editorial fashion only and for the benefit of such companies with no intention of infringement of the trademark. They are not intended to convey endorsement or other affiliation with this book.
While reasonable care has been exercised in the preparation of this book, the publisher and author(s) assume no respon-sibility for errors or omissions, or for damages resulting from the use of the information contained herein or from the use of the discs or programs that may accompany it.
This book is printed on acid-free paper.
T A B L E O F C O N T E N T S
Table of Contents
Chapter 1  Basics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.1 Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2.1 Using GIMP 2.8—About This Book . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2.2 About GIMP 2.8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.2.3 Overview of the Most Important Improvements and Changes in GIMP 2.8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Introduction to Digital Image Editing. . . . . . . . . . . . . . . . . . . . . . 9 1.3.1 Characteristics of Pixel Images. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.3.2 1.3.3
1.3.4
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Screen Colors—Color Models and GEGL, the New Graphics Library . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Important File Formats for Practical Work . . . . . . . . . . . . . . . . . . . . 16
1.4 Loading and Managing Digital Photos on the Computer . . .20 1.4.1 Using the Operating System’s File Management Tools to Import Images from a Camera . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 1.4.2 Using Wizards to Import Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 1.4.3 Using the Operating System’s File Management to Organize Photo Collections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.4.4
1.4.5
Helpers: Image Management Programs for Windows, Linux, and Mac OS X . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Converting Camera RAW Image Formats under Windows, Mac OS X, and Linux: Freeware and Plug-Ins . . . . . . . . . . . . . . . . . 27
1.5 Get GIMP Running . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 1.5.1 Where Can I Get GIMP?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.5.2
1.5.3
1.5.4
1.5.5
1.5.6
Installing GIMP and Plug-Ins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Is GIMP Insecure? Some Comments and Tips . . . . . . . . . . . . . . . . 39
The GIMP’s Program Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Using and Customizing the Program Interface— Important Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Real Help—GIMP’s Help Function . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Chapter 2  Using GIMP: Correcting and Touching Up Your Images. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
2.1 Working with GIMP: Image Adjustment and Retouching. .60 2.1.1 Opening, Setting, and Storing an Image: The Steps. . . . . . . . . . . 60
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.1.7
2.1.8
2.1.9
Opening an Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
The Image Window—Your Workspace . . . . . . . . . . . . . . . . . . . . . . . 65
Rotating an Image by Fixed Values. . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Changing the Image View Size (Zooming) . . . . . . . . . . . . . . . . . . . 69
Cropping (Clipping) an Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Setting the Image Size and Resolution . . . . . . . . . . . . . . . . . . . . . . . 74
Scaling the Print Size of Images— Converting Resolution and Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 Saving Your Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
2.1.10 Before Printing—Calibrating Monitors and Color Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 2.1.11 Printing Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
T A B L E O F C O N T E N T S
O F T A B L E C O N T E N T S
2.2
2.3
Working with Scanned Images . . . . . . . . . . . . . . . . . . . . . . . . .89 2.2.1 Prerequisites for Scanning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.2.7
2.2.8
2.2.9
How Scanners Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Problems When Scanning Printed Originals— the Moiré Effect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Calculations to Consider before Scanning. . . . . . . . . . . . . . . . . . . . 91
Scanning and Editing an Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Typical Errors in Scanned Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Setting the Image and Determining the Angle—Measuring . . 98
Rotating an Image—Using the Rotate Tool. . . . . . . . . . . . . . . . . . . 99
Cropping an Image—the Crop Tool . . . . . . . . . . . . . . . . . . . . . . . .100
2.2.10 Using the Gaussian Blur Filter to Remove the Moiré Effect . . .101
Adjusting and Improving Color and Exposure . . . . . . . . . 103 2.3.1 Levels (Tonality Correction) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .103
2.3.2
2.3.3
2.3.4
2.3.5
Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106
Adjusting Hue and Saturation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112
Overview of the Functions in the Image > Colors Menu . . . . .114
Saving an Image in Compressed Format (JPG/JPEG) for the Internet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .116
2.4 Touchup Work 1—Color Casts . . . . . . . . . . . . . . . . . . . . . . . . 120 2.4.1 What Is Touchup Work? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .120
2.4.2 Color Correction Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .121
2.4.3 Using the Levels Function to Correct Color Casts . . . . . . . . . . . .121
2.4.4 A Second Method of Removing Color Casts— Color Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
2.5 Touchup Work 2—Removing Spots, Dust, and Scratches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126 2.5.1 Why You Need Smooth Brushes—the Clone Tool . . . . . . . . . . . .127
2.6
2.5.2 Creating New Brush Pointers in GIMP and Importing Adobe Photoshop Brushes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .128
2.5.3 Selecting the Clone Tool Options . . . . . . . . . . . . . . . . . . . . . . . . . . .131 2.5.4 Using the Clone Tool for Touchup Work . . . . . . . . . . . . . . . . . . . . .133 2.5.5 The Healing Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .136
Performing Magic—Editing Photographs with Graphic Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 2.6.1 Sharpening Images and Image Elements . . . . . . . . . . . . . . . . . . .137 2.6.2 Noise Reduction and “Smoothening” Images. . . . . . . . . . . . . . . .141 2.6.3 Simulating Film Grain—Covering Up Blemishes with Noise and Pixels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .148
Chapter 3  Using Masks and Layers—Painting, Filling, and Color Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .155
3.1 Introduction to Masks and Selections . . . . . . . . . . . . . . . . . 156 3.1.1 Overview of Select Tools in the Toolbox . . . . . . . . . . . . . . . . . . . . .157 3.1.2 Tips for Handling Select Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .158 3.1.3 The Select Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .159 3.1.4 The Edit Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .161
3.2 Touchup Work 3—Removing Red Eyes . . . . . . . . . . . . . . . . . . . . 163 3.2.1 Avoiding Red Eye—Using the Flash Correctly . . . . . . . . . . . . . . .163 3.2.2 Eliminating the Red-Eye Effect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .164
T A B L E O F C O N T E N T S