compression

RAR Expander is a free utility for expanding archive files with the .rar format (typically received from PC users). The Mac OS used to come bundled with software that could expand .rar files, but now you need to install a separate program--such as RAR Expander--if you need to work with them.

RAR Expander doesn't have a particularly pretty interface, but it expands files quickly and reliably. All you have to do is choose Expand from the app's File menu (which is the only command in the app's File menu), browse to find the .rar archive that you … Read more

In OS X, the Finder comes with a handy archiving option (called "Archive" in OS X prior to Leopard, and "Compress" 10.5 and above) that is available in the contextual menus as well as in the File menu. This feature will compress all selected files and folders into a ZIP archive for easy transfer to hard disks, network shares, or internet folders. In Snow Leopard, some people have had problems with the archive process, where it will pause indefinitely and fail to complete the compression.… Read more

Dynamic range compression and lossy file compression are completely different things. What's the difference?

Dynamic range compression squashes soft-to-loud volume shifts. This form of compression has been used by recording, mixing and mastering engineers for decades.

Other than bona-fide audiophile recordings, most of the music you hear has been dynamically compressed--which isn't necessarily a bad thing, as dynamic range compression adds punch, presence, and impact to music.

It's just that over the past decade or so the trend is to overcompress dynamics, so not only has music lost most of its natural soft-to-loud dynamics, but nuance and subtle detail are missing as well. The loud-all-the-time aesthetic is boring.

Recordings with less compression have lower (quieter) overall volume, so if you go from listening to maximally compressed contemporary recordings to something with less compression you need to turn up the volume to compensate for the difference.

As a consumer of music, you don't have the option of buying uncompressed music. If the engineers squashed the soft-to-loud dynamics out of the new Lady Gaga record there's no way of getting them back. Once sound is compressed, you can't decompress it. If you want to hear music with less compression, buy original pressings of 1960s or 1970s LPs. Yes, some of those will be compressed, but less than contemporary recordings. … Read more

On2 Technologies has filed an update with the SEC on its proposed merger with Google, hoping to put to rest some key questions.

On2, which makes video compression software, announced Monday that the update includes certain key highlights about the merger and some frequently asked questions.

On2 agreed on August 5 to be acquired by Google for $106.5 million, a deal already approved by its board of directors. The terms call for each share of On2 to be exchanged for 60 cents worth of Google common stock.

With its board anxious for investors to approve the deal, On2 outlined some of the risks … Read more

PPT to Video Scout provides a simple tool for quickly converting slideshows into video files. With quite a basic layout, it's easy to use. It does a fine job of producing high-quality video that can add visual appeal and a professional touch to your presentations and projects.

The interface is a breeze to navigate, thanks to a Wizard-like layout and simple commands. We were never confused, nor did we feel the need to visit the Help file for further instructions. We were able to choose one PowerPoint file at a time to convert, which kept us focused on the … Read more

UnRarX is a simple freeware utility for expanding .rar archive files and restoring corrupted archives with .par and .par2 files. The Mac OS no longer includes software for unpacking .rar files, so if you want to expand these kinds of files (usually from PC users), you'll need to download some sort of unarchiving app to do so.

UnRarX has a fairly crude interface--a single log window with options to test, browse, extract, or enter a password for protected archives--but its drag-and-drop simplicity and high success rate have made it a popular choice for users who want a reliable, bare-bones … Read more

Dynamic range compression isn't new, it's been used by recording, mixing, and mastering engineers for many decades. A little bit of compression is fine, but over-compression can sound downright ugly. Most of today's music, whether it's on LP, CD, the radio or iTunes is over-compressed. Most remastered CDs are over-compressed.

Before we go any further, I'm not referring to the lossy compression used in MP3s, or lossless compression used in Apple Lossless. They've got their own set of problems, but dynamic range compression is a very different predicament.

To the casual listener compression can sound "good," mostly because it makes the music seem louder and punchier, and once music's natural soft-loud dynamic shifts are squashed flat music is easier to hear in noisy environments like cars or over iPods. Compression reduces the need to adjust playback volume--because it's always nearly the same volume--loud.

Engineers worry that if they don't compress their recordings the music would seem too soft and low. That is, if a music listener went from really loud, compressed music to quieter, uncompressed music they probably wouldn't like uncompressed music--unless they turned it up! That way they would hear the music's natural soft-loud dynamics.

Unfortunately, that's not an acceptable scenario to most engineers or record labels. They're addicted to over-compression, it's a hard habit to break.

But the unnatural onslaught of compressed sound obliterates musical nuance, delicacy and emotional power. Compression's loud-all-the-time nature sucks the life out of music.

Here's a great video that demonstrates the evils of compression.… Read more

Image Compressor 2008 Pro Edition is a full-featured digital image editor. Although it won't replace Photoshop or other top-of-the line editing software, it's a great choice for users seeking a fairly lightweight program that still delivers plenty of options.

The program's interface is quite sleek and intuitive, although we were dismayed that the Quick Start Guide, which seems to invite users to click on it for information about different topics, couldn't actually be clicked on at all. This was the only hiccup we encountered, though. The interface is fully configurable, allowing users to customize the layout … Read more

FILEminimizer Office - Compact Edition offers to take large files and shrink them into a smaller package, while maintaining the original's integrity. With simple navigation and fast results, this program more than lives up to its promise.

We were slightly challenged by the program's interface, but luckily most of the commands are intuitively labeled. The online Help file didn't walk us through anything and should have been skipped. However a little experimenting was all that was necessary to fully understand adjustments that could be made. We were impressed at the clever utilization of a search engine to … Read more