Although GIMP is useful, it's showing its age, and the time is coming soon when it either will adapt or be shuffled to the wayside by more capable tools. For the photographer working in Linux, as well as for the high-depth CGI artist, both Krita and CinePaint are welcome tools. Each is strong where the other is weak. As both programs continue to develop, we can expect great things from them—they have both proven themselves to be well-designed packages with deliberate and capable teams behind them. The odd mix of Darwinian competition and cooperation has given us a new generation of these tools, and they're ready to be used. Enjoy!
HDRI: Faking Film's High Bit Depth
High Dynamic Range Imaging was originally developed for lighting 3-D scenes, as a way to capture the real-world range of luminescence, and has been a boon to realistic 3-D lighting work for many years.
But, it has another use. By tone mapping the image, HDRI's wide contrast range can be represented in 8-bit space to stunning effect—preserving details in the shadows and minimizing clipping in highlights. As this aesthetic became popular, several techniques have developed to create HDRIs from digital snapshots and then convert them for display on monitors or in print.
Creating HDRI images from digital photographs requires Bracketed Exposure—taking a set of photos with different exposure settings to give a wider collective latitude than the camera natively allows (Figure A). Afterward, the bracketed images are combined into a single HDRI. Although this can be in the terminal, it's far easier with CinePaint's self-explanatory Bracket to HDR plugin (included in the package). Once created, the HDRI either can be turned into a light probe (for lighting a 3-D scene) or tone mapped for display and/or printing (Figure B).
Tone mapping interpolates an HDRI into 8-bit space without clipping the high and low ends—it compresses the image nonlinearly to preserve the details otherwise lost. The result is a much richer image than could normally be captured by 8-bit equipment. At the moment, tone mapping isn't available in CinePaint or Krita (although it is on Krita's to-do list). Instead, pfstools, a command-line suite of algorithms for configuring the interpolation curves, does the job.
Fortunately, for those of us who don't like experimenting blindly in the terminal, a thoughtful soul has written a GUI that offers the full range of options available at the command line, with a preview window. The program, Qpfstools, along with an introduction and tutorial, can be found here: theplaceofdeadroads.blogspot.com/2006/07/qpfstmo-hdr-tone-mapping-gui-for-linux_04.html.
Dan Sawyer is the founder of ArtisticWhispers Productions (www.artisticwhispers.com), a small audio/video studio in the San Francisco Bay Area. He has been an enthusiastic advocate for free and open-source software since the late 1990s, when he founded the Blenderwars filmmaking community (www.blenderwars.com). Current projects include the independent SF feature Hunting Kestral and The Sophia Project, a fine-art photography book centering on strong women in myth.
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
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- Paranoid Penguin - Building a Secure Squid Web Proxy, Part IV
- SUSE LLC's SUSE Manager
- Google's SwiftShader Released
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- Managing Linux Using Puppet
- My +1 Sword of Productivity
- Non-Linux FOSS: Caffeine!
- SuperTuxKart 0.9.2 Released
- Parsing an RSS News Feed with a Bash Script
- Doing for User Space What We Did for Kernel Space
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide