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Linux Tools for Digital Imaging, Graphics Design and Spherical Panoramic Photography

Digital photographic image technology, representations, formats, Linux software tools for image viewing, resizing, editing, graphics editing, graphics design, panoramic stitching and spherical panoramic photography software for Linux. Most of the image editing and processing tools discussed are Free and Open Source Software (FOSS) based tools and all are available on the Linux platform.

Tutorial Table of Contents:

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°Online Photo Album

°Linux Video

°Linux Video: OpenShot

°YoLinux Tutorials Index

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Digital Images and Formats:


Color is the human perception of various frequencies/wavelengths and intensity of light (electromagnetic radiation) based on an object's physical properties such as light absorption, reflection, or emission spectra. Colors are defined and quantified by the degree to which they stimulate human cone cells in the retina. For humans, this is known as "visible light".
color wavelength range
frequency range
red 700–635 nm 430–480 THz
orange 635–590 nm 480–510 THz
yellow 590–560 nm 510–540 THz
green 560–490 nm 540–610 THz
blue 490–450 nm 610–670 THz
violet 450–400 nm 670–750 THz

Digital display of color:

Digital monitors: The representation of Red, Green and Blue (RGB) combined (additive coloring) to radiate light in various quantities to achieve the appropriate color. Each color can be represented by individual numeric quantities.
The combination of all colors renders white.

Digital printers: Cyan, Magenta and Yellow (CMY) combined (subtractive coloring) to absorb light in various quantities to achieve the appropriate color.
The combination of all colors renders black.
Primary colors are red, blue and yellow which can be combined to any other color (used in the arts and painting world).

Digital representation of color:

Hex representation of the digital representation of colors: The more bits which are assigned to represent a color, the more shades that can be represented. Twenty four bit color uses eight bits to represent each of red, green and blue. Eight bits can represent a number from 0 to 255 (0 to FF in hex).
White (All colors)FFFFFF 
Black (No colors)000000 

See color picker

Image Formats:

TIFFTagged Image File Format: supports a wide range of options. Most applications only support a subset of TIFF called baseline TIFF. Lossless LZW compression. Expired Adobe ownership. Used by scanners and professional photographers. Not a good web format.
GIFGraphics Interchange Format: 8 bits/pixel, colormap of 256 colors from a 24 bit RGB colorspace. Compressed (LZW). Good for simple images. Patents were owned by Unisys and Compuserve. Patents have expired. Supports interlacing, animations and transparency. Best for non photographic images with fewer colors.
Little endian byte order
JPEGJoint Photographic Experts Group: preferred for photographs as it supports more colors simultaneously. Compressed (10:1) with quality of 1 to 100 (full quality) using Huffman encoding of 8x8 pixel blocks. Starts to have obvious pixelation after about 70 due to reduced color availability. Lossy compression (acceptable for web). Various formats available eg 12 bit version for greyscale medical imaging, Exif and JFIF. Uses YCC (not RGB unless at quality 100%) to store brightness (luma) and color (chroma B & chroma R). Patents overturned due to prior art or have expired (20 yrs). (.jpg .jpeg .jpe .jif .jfif .jfi)
Big endian byte order
PNGPortable Network Graphics: 24 bit and 32 bit color palettes. Lossless MNG compression. Supports multiple representations for color palette index (color map). Supports transparency, interlacing, animations. Comparable to GIF without the 256 color palette limitation. JPEG better for images.
XPMASCII Text - good for embedding images in C/C++ and Python source code
PGMPortable Greymap
BMPMicrosoft bitmap image file: Supports multiple compression methods or none and multiple bits per pixel varieties.
ICOIcons (web and Microsoft desktop)
RAWno compression. Full color (no translation to color map). Direct dump from camera. No compression thus large files. Hundreds of formats due to variations in cameras CCD, resolution and sensitivity.
SVGScalable Vector Graphics: coordinates for line segments and curves. Not an pixel raster image.

Also see the YoLinux image mime type example tests.

High Dynamic Range (HDR) Photography:

Example of multiple bracketed images contributing to an HDR resulting tone mapped image HDR Photography is an attempt to even out extreme contrast ranges in light exposure. Extreme contrast ranges can have the effect of clipping dark regions to areas of the photograph which are all black and bright regions to areas of all white. HDR photography is accomplished by taking several images of the same subject and varying the exposure (fraction of a second), the aperture (f-number) and sensitivity (iso value). This is called 'bracketing'. The bracketed images are combined to form a "tone mapped" image by taking only the properly exposed pixels of each image which are best suited for display or print. The tone mapping reduces the dynamic range of the image while retaining the local contrast between pixels.

Exposure fusion is a similar and more simple technique creating the resulting tone mapped image directly from the bracketed exposures without generating the intermediate HDR image.

HDR Image Formats:

  • OpenEXR is a high dynamic-range (HDR), high color fidelity image file format (.exr) developed by Industrial Light and Magic for digital imaging. The OpenEXR format was used in the movies Harry Potter and the Sorcerers Stone, Men in Black II, Gangs of New York, and Signs and is ILM's primary image format. Also supports transparency.
    There are also open source libraries available: IlmImf, lmath and an image display application "exrdisplay".
    See: http://www.openexr.com/
    Source code: https://github.com/openexr/

  • RGBE HDR Radiance (.hdr) source images use a four bytes (a full 32 bits) to store pixel information. It avoids clipping by offering a higher range of values by using the fourth byte to store exponent information for the quantity of light per pixel. The first three bytes are RGB color data.

  • 32 bit floating point TIFF supported in current COTS imaging programs.

  • Photoshop PSD and PSB large document format supports 32 bits, 300,000 pixels in any dimension. Support limited to Photoshop.
Generate tonemap HDR image files (OpenEXR, RGBE, TIFF or PFS) from a set of JPEG, TIFF or Raw images with QtpfsGui or the Gimp plugin Exposure-blend.

Also see Linux and HDR workflow.

Linux Monitor Calibration:

To edit photos correctly and to perform color manipulation properly, one must calibrate the monitor so that when the software displays red, red is what is displayed. This requires a "Colorimeter" which can measure the exact frequency and magnitude of light being displayed by the monitor. Any variance can be adjusted with the video card gamma table and monitor controls. Calibration settings include:
  • White Point: native white for the display. Typical values: 5000 to match print media (number refers to a temperature in degrees Kelvin).
  • White Level: measured in cd/m2
  • Black Level: target brightness of black in cd/m2
  • Tone curve/gamma: default is 2.2.
  • Black output offset:
  • Black point correction:

The "Colorimeter" and affiliated software are used to generate an International Color Consortium (ICC) color profile which can be used to adjust your graphics card and monitor to display the correct colors.

The ICC profile of a device (monitor, camera, scanner, printer, ...) describes the color reproduction characteristics for the device. The device profile is stored in a display.icc file representing the ICC color profile for the device, in this case a monitor. The ICC profile is a table describing the properties of a colorspace (range of colors). A device with a large colorspace is preferred.

Color Settings:

To view your current color profile and settings start the Gnome systems setting tool (/usr/bin/gnome-control-center) and choose color:

Gnome color settings tool
Select "View details". If a colorimeter is connected, the "Calibrate..." option will not be grayed out.

The colorspace gamut
The CIE 1931 colorspace gamut tab

TRC: Tone Reproduction Curve tab

Color Calibration:

The following software can calibrate, generate profiles and set the video card gamma table with corrective parameters. The software also supports verification of settings.


dispcalGUI: monitor and graphics card calibration software

Part of the Argyllcms suite of tools. Python program which works with a variety of color meters to define adjustments which need to be made to correct color, brightness/darkness, contrast, etc

Install: apt-get install dispcalgui
Install dependencies: apt-get -f install
Run: /usr/bin/dispcalGUI
(note location of Argyll: /opt/Argyll_V1.5.1/bin)

Requires Argyll: download Argyll_Vx.x.x_linux_x86_xx_bin.tgz

KDE digiKam

KDE digiKam: monitor calibration support

Photo manager and camera image offload program with built-in monitor calibration interface. Select "Color Management".



Colorimeters, also known as Spectro-Colorimeters or Spectrophotometer, are color measurement instruments which are required to measure the color output by the monitor. The products shown are USB devices which are manually placed against the screen to measure display color from known spectral image samples.


Xrite Colormunki Colorimeter

DispcalGUI will work with the following models:
  • X-Rite DTP92 and DTP94
  • X-Rite/GretagMacbeth i1 Display 1 and Display 2/LT
  • X-Rite i1 Display Pro
Datacolor - Spyder

Datacolor Syder Colorimeter

DispcalGUI will work with the following models:
  • Datacolor Spyder 2, 3 and 4

ColorHUG: colorimeter

Monitor calibration based on Linux and open source. They ship a USB based colorimeter and a Linux LiveCD.

Linux Imaging and Graphics Design Software:

Pixel based image processing allows for editing and enhancement of photos and photo image based file formats like JPEG. Vector graphics images are not stored on a pixel basis but on a geometric basis of points, lines and curves and are more popular with graphics designers. Thus the editing must be performed on the geometry. Hybrid editors are becoming popular which allow the use of vector graphics and pixel based images.

Linux imaging and editing software falls into two categories:
  1. # pixel based graphics
  2. # vector based graphics

Software applications for image and photo viewing and pixel editing:

Pixel based image viewers and photo editors:


eog: Gnome image viewer

Eye of Gnome: Supplied with most distributions of Linux as the default desktop image browser for systems using the Gnome desktop. Mostly used for viewing image files. Editing is limited to scaling, rotation and flipping of images.

shotwell: Gnome image import, editing and photo managment tool

Gnome camera image import, viewing and photo organization program. Supports simple image editing such as rotation, crop, red eye reduction, exposure adjustment, color saturation and tint as well as web sharing to popular photo sharing web sites. Very time and date centric. I still prefer organization by directory.

digiKam: KDE image import, editing and photo managment tool

KDE camera image import, viewing and photo organization program. Supports JPEG as well as RAW camera imports and tweaking. Supports geo-coding and processing of negatives. Supports display monitor calibration.
Organization by directory with storage of meta information makes it a little more flexible than Shotwell's mandated time stamp directory organization. DigiKam has strong photo search capability due to meta-tagging photo information.

gwenview: Kde image viewer

Image viewer for the KDE desktop. Viewing and image interrogation. Has sharing interface for most of the popular image sharing web sites. Editing is limited to image resizing, rotation, flipping, cropping and red eye reduction of images.

xv: image viewer and editor

xv: image viewer interface controls

xv: image viewer color control and editor

Legacy viewing and image manipulation tool. Edit image with full view of inner workings of the image file such as Gif colormap, color saturation, etc. One of the first FOSS image viewing and editing software applications available on Linux/Unix.

xv manual [pdf]


KolourPaint: simple image raster annotation (add lines, arrows, curves, circles, boxes, text)

Paint program, simple image raster annotation (add lines, arrows, curves, circles, boxes, text). Simple graphic generation. Not a photo editor although it can import photographic images for markup.

Ubuntu 12.04 Installation: apt-get install kolourpaint4


Gimp: image viewing and editing program

Supplied with most distributions of Linux as the default desktop image tool. Fully featured editing and pixel image manipulation tool. Many plugins available. Photoshop "like" image editing supporting layers, color editing, perspective and distortion correction, colorizing, image retouching, transparency, sizing, rotation, format conversion, text support, etc.

Gimp users manual (2.8)


tamanoir: Digital Imagery tool to remove dust artifacts

Test image with dust artifact
Notice dust/hair like artifact in upper right hand portion of image

tamanoir: replace artifact with cloned pixels
Circle identifies pixels to clone over artifact identified by point of arrow.

Image processing tool to remove small dust artifacts from picture scans.
(similar to the Gimp "clone stamp" tool)

Ubuntu deb package generation and installation:

  • apt-get install libtiff-dev
  • apt-get install libhighgui-dev
  • apt-get install libqt4-dev
  • apt-get install dpkg-dev
  • apt-get install libopencv-core-dev
  • apt-get install libopencv-video-dev
  • apt-get install libopencv-features2d-dev
  • apt-get install libopencv-objdetect-dev
  • apt-get install libopencv-ml-dev
  • apt-get install libopencv-contrib-dev
  • apt-get install libopencv-legacy-dev
  • svn checkout http://tamanoir.googlecode.com/svn/trunk/ tamanoir
  • cd tamanoir
  • ./build_debian.sh
  • dpkg -i /tmp/tamanoir_1.svn20130305-1_amd64.deb

Start application: /usr/bin/tamanoir

Auto identify artifacts or manually move green box to artifact. Clone mode will identify source pixels to clone and arrow will show artifact (pixel clone destination). Left window shows original image while right window will preview the changes.

Artifact Categories:
  • Positive: artifacts to detect are darker than image
  • Negative: artifacts to detect are lighter than background

Tamanoir users manual


XnConvert: simple image editing and format translation
File browsing and selection

XnConvert: image rotation
Image rotation menu

Commercial donation based freeware.
Simple editing: rotation, crop, resize, adjust brightness, contrast, saturation, filter blur, sharpen, watermarking, vignetting (fix optical edge effects), ...

Strength: Capable of converting between hundreds of different image formats. Use other tools for editing.


Fixpicture.org: online image editing and conversion

Online web tool. Upload photos and simple edit online. Format conversions. Very limited editing capability.
Note that while Xara Xtreme can edit and manipulate pixel images, Xara is primarily a vector graphics tool and as such is listed below.

Command line/Batch Imaging:

Software applications for Scalable Vector Graphics (SVG):

Vector and wire-frame graphics:

Note that Kara Xtreme and Krita have combined support for pixel and vector graphics.
Open Office/Libre Office Draw

Libre Office Draw: Linux drawing, charting and sketching program

Drawing, diagramming, charting and sketching program, simple image editing. Simple business and presentation graphics generation. Can output image formats (BMP, GIF, JPEG, PNG, TIFF, ...)
Xara Xtreme

Xara Xtreme: image editor and graphics illustrator

Desktop photo image manipulation, image editing and vector graphics design software. Claims to be very fast with live interactive image updates (not command then wait, fully interactive image adjustments and changes). Based on wxWidgets GUI framework. Photo image editing (red eye reduction, color balance, tones, shadows, color blending, special effects, fades, frames, feathering, lighten/darkening, transparency support). Although it supports so many image editing features, it is not a pixel editing tool. Supports the generation of graphics, text, complex polygons and Scalable Vector Graphics (SVG). Supports most Adobe Illustrator drawing features. Supports Adobe Photoshop and Illustrator files as well as Photoshop plugins.

GNU open source with impressive professional graphics capabilities.

Download: RecomXaraLX0.7_rev1692.tar.bz2
Install (eg to /opt/): tar xjf RecomXaraLX0.7_rev1692.tar.bz2
Run: /opt/xaralx/bin/xaralx

Software demonstration videos of Xara Xtreme:

Generate and edit Scalable Vector Graphics (SVG) images

Generate and edit Scalable Vector Graphics (SVG). Native file format is SVG.

Install: apt-get install inkscape

Inkscape user's manual


KDE Karbon: generate and edit Scalable Vector Graphics (SVG)

KDE desktop tool to generate and edit Scalable Vector Graphics (SVG). Support for ODG, SVG, WPG, WMF, EPS/PS vector formats. Drawing and path editing support.

Ubuntu 12.04 Installation: apt-get install karbon

Also see Xara Xtreme

KDE Krita: combined pixel and vector layers to support paint and illustration

Derived from Gimp, KOffice/Calligra KImageShop. Painting and image editing. Combines pixel and vector layers to support paint (brushes, patterns, textures and gradients) and illustrator (lines, curves and polygons) features. Supports HDR (Open EXR) and ColorIO for visual effects work.

File import support: Photoshop PSD, PNG, BMP, GIF, JPEG, JPEG2000, EXR, PNM, EPS. PDF, OpenDocument ODG, OpenRaster, Camera RAW, TIFF, XCF and many more ...

Ubuntu Installation: sudo apt-get install krita

tutorial and examples

Specialized image tools:

CCD/Camera "raw" images:

Support for raw image formats: CRW, NEF, RAF, CR2, DNG, ...

Digital Camera Storage:

I have always been able to read digital cameras with Linux either using the USB interface or removing the SD card and puting it in a USB attached SD card reader. No special drivers are required. Using the Gnome Nautilus file browser I have always been able to download photos and video.

Tip: The SD memory cards used in cameras are typically formatted using the Microsoft DOS FAT16 or FAT32 format. When using an SD memory card in your camera which is greater than 32 Gb, Linux will require additional support drivers to read the "Extended FAT" device:
  • sudo add-apt-repository ppa:relan/exfat
  • sudo apt-get update && sudo apt-get install exfat-utils fuse-exfat
No reboot required.

Tethered Camera:

(trigger camera shutter remotely from PC)

Satellite and Multispectral Imagery:

Satellite sensors often gather data in frequency bands invisible to the human eye or in ranges too sensitive for humans to distinguish as different. Image file formats cater to human vision and are usually not valid formats for the frequency spectrum gathered by the sensor. This is true for infrared sensors, chlorophyll and organic carbon studies, etc. For this reason, satellite sensor data is not stored in standard image formats but more typically in HDF format which hosts an internal hierchical data schema specific to a given sensor. Sensor data can be mapped to various colors for human display and study. Tools like HDFView can generically view and plot graphs of the raw numerical data. Image tools like SeaDAS can generate image displays of the data. GDAL and GMT are typically used when earth projection and warping of data to the globe and vice versa are required.
  • NASA Satellite sensor ocean color data and image downloads - publicly available raw satellite data (HDF5) for various satellite sensors, various parts of the planet and for various dates and times.

  • HDF5 - Hierarchical Data Format. Site has libraries and tools for use with HDF5 files. Supports the ability to organize, store, discover, access, analyze and share data. Developed by NCSA, LBNL and DOE. (downloads)
    HDFView - Java file viewing GUI for HDF4 and HDF 5 files.
    HDFView with VIIRS data
    Tree view on left shows data schema while right hand side shows the data. Select the graph icon to plot data.

  • SeaDAS - SeaWiFS Data Analysis System (SeaDAS) to process, display and analyze satellite ocean color data. Supports statistics and plotting functions, map reprojection and geo-coding.
    (screenshot of sensor data mapped to colors)    (SeaDAS downloads)

  • GDAL - Geospatial Data Abstraction Library - GIS tools from the "Open Source Geospatial Foundation". Raster geospatial data format translation library and command line tools (translate, warp, etc for raster and vector data).
    Released with FWTools (compiled binary downloads [alt]) includes GDAL, NetCDF and other library dependencies. FWTools is a set of GIS tools for raster/vector viewing, projection and mapping/cartography. Includes OpenEV geospatial data analysis viewer for raster and vector data.

  • GMT Generic Mapping Tools (140 command line tools for manipulating geographic and Cartesian data sets in support of mapping)
    School of Ocean and Earth Science and Technology University of Hawaii Manoa
    GUI front-end to GMT command line tools: Mirone, iGMT (Tcl/Tk)

Steganography: Hidden Messages and Invisible Watermarks

Steganography is the technology of embedding a message within an image. It is not visible and typically requires a password and decryption to extract. Steganography can also be used to mark images with digital watermarks for identification.
Linux Steganography Software:

Panoramic imagery tools:

Image stitching software (Linux and other platforms):

  • Hugin - GUI photo stitching application (premier FOSS tool for photo stitching)
    (includes PanoTools dependencies and Nona, a PT Stitcher equivalent)

  • Pano tools Home - Pano tools on Sourceforge - pano tools Sourceforge project page
    by Prof. Dr. Helmut Dersch (Hochschule Furtwangen University of Applied Sciences)
    • PT Stitcher: GUI stitching program
    • PT Mender: GUI stitching program to replace PT Stitcher
    • PT Viewer: interactive viewers (Javascript, WebGL, OpenGL, Quicktime, Java applet)
    • PT Optimizer: optimizes control points

  • Gimp plugin: Stitch Panorama (python plugin)

Hugin: Panorama Photo Stitcher

Hugin has matured greatly and is a solid panoramic photo stitching tool. It supports a fair amount of automation including automatic generation of control points and stitching as well as very esoteric and advanced support for HDR, lens distortion, exposure optimization and horizon straightening.

Install: apt-get install hugin

Following the three step "assistant" is the easiest approach:

  1. Load images: select the images to load.

    Hugin: load images

  2. Align images: select the "Align..." button and after processing, the preview panel will display.

    Hugin: image preview

    Hugin: image layout

  3. Create panorama: Using the defaults will generate a project file and a TIFF image.

    Hugin: processing feedback screen

[Potential Pitfal]: Note that binary releases of Hugin for Red Hat/Fedora does not compile in automated control point generation due to fear of patent reprisal. You will get this message if this capability is not built-in:
Hugin warning about auto control point functionality

Spherical Panoramic imagery tools:

Spherical Panoramic Photography allows for 360 degree horizontal panoramic coverage as well as 180 degree vertical viewing. The resulting image is an immersive all-around view from a single location.

Spherical Panoramic Photography is enabled by using a Spherical Panoramic tripod head which rotates the camera about its focal point to avoid parallax and allow seamless photo stitching of images.

Pano Heads:

Motorized Pano Heads:

Spherical panoramic tripod head
Spherical Panoramic Tripod Head

Spherical Panoramic Cameras:

Spherical Panoramic cameras are available which take a single pano shot. This is enabled by the use of multiple CCDs and wide angle lenses or curved mirrors which broaden the field of view to 360 degrees for a single CCD and lens.

Commercial Linux Spherical Panoramic Software:

Sample Spherical Panoramic Photography:

Spherical Panoramic Video:

  • Immersive Media - 360 video equipment and software, also demos
  • Kolor - 360 GoPro video based hardware and stitching software
  • GoPano - bell shaped mirror for video and photo
  • 360Heros.com - GoPro 360 video mounts

Structure from Motion:

Spherical Panoramic Photography is the 360 degree view of a single point, looking outwards and is enabled by stitching complete coverage of the sphere as formed by that point.

Structure from Motion (SfM) generates an imaging experience where the view is on the outside looking in at the object. This allows for an unlimited number of view points and thus it is impossible to have 100% photogrphic coverage. Thus photographs are used to generate points to define a 3D point model from which one can generate a faceted 3D model upon which photographic texturemaps can be applied. This 3D CAD model can then be viewed from any direction. At first custom viewers were used but now that most browsers support WebGL, it has become the leading web format.

The leading commercial innovator in the field is Microsoft which is building the Microsoft Photosynth software and cloud service to generate SfM models. The Microsoft ICE program stitches photos and Microsoft Photosynth is used to generate and publish the SfM model to the Microsoft cloud.

The first SfM software was developed by universities and public institutions in both the USA and Europe and made available to the open source community.

Step 1: Generate the point cloud from photographs. This is called "Structure from Motion". SfM software:

Step 2: Generate a triangular faceted mesh model from a point cloud
  • MeshLab: process and edit 3D triangular mesh models
    GNU license

Step 3: View

Commercial Products:


  • Panoramic hosting
  • GD Library - graphics library
  • XMP Manager - GUI to manage XMP metadatas. XMP is a schema for EXIF, IPTC, JFIF,.. metadatas within JPEG, PSD, TIFF, AVI, WAV, MPEG, MP3, MOV file formats
  • GPS/Geocoding:
    • GpicSync - auto geocode photos from GPS track log
    • GPS Babel - GPS conversion and transfer
      Download tracks from a USB connected Garmin: gpsbabel -t -i garmin -f usb: -o gpx -F GpsTrackLog.gpx
    • GPS/GIS


"Fundamentals of Digital Imaging"
by H. J. Trussell and M. J. Vrhel
ISBN # 052186853X Cambridge University Press

Introduction to digital imaging covering core techniques of image capture and display of monochrome and color images. Presents fundamental tools within a powerful mathematical framework. Suitable for advanced undergraduates and graduates in electrical engineering and computer science, and practitioners in industry.

"Gimp 2.8 for Photographers: Image Editing with Open Source"
by Klaus Goelker
ISBN # 1937538265 Cambridge University Press

Guide to the user interface and tools

"Xara Xtreme 5: The Official Guide"
by Gary David Bouton
ISBN # 0071625593 McGraw-Hill Osborne Media; 1 edition (October 15, 2009)

How to use QuickShapes, draw vector paths, use fills for photorealistic effects, and compose professional desktop publishing documents. Concept to completion with examples that span a range of art styles--using the vector drawing program that thinks it's a bitmap editor.

"Inkscape Beginner's Guide"
by Bethany Hiitola
ISBN # 1849517207 Packt Publishing (May 24, 2012)

Graphics design guide to generate complex shapes, stylized text, use filters and work with images.

"The Book of Inkscape: The Definitive Guide to the Free Graphics Editor"
by Dmitry Kirsanov
ISBN # 1593271816 No Starch Press; 1 edition (October 6, 2009)

From the basics of using the program: drawing, working with objects, transformations and styling, adding text and shapes to how to create business cards, animations, and technical and artistic drawings.

"Complete Guide to High Dynamic Range Digital Photography"
by Ferrell McCollough
ISBN # 1600591965 Pixiq; 1 edition (May 6, 2008)

Thorough, easy-to-follow, and visually spectacular guide.



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