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Lepton 1.2

Compress JPGs by 20% or more

by Mike Williams

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License: Open Source
Operating Systems: Windows 10, Windows 7 (32 bit), Windows 7 (64 bit), Windows 8
Requirements:
Languages: English
Software Cost: Free
Date Updated: 28 November 2016
Watchlist: Add download to my watchlist
Downloads To Date: 115
Developer: Dropbox
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Lepton
Compress JPGs by 20% or more

Lepton is an open-sourced Dropbox technology for the lossless compression of JPEGs.

The program can compress JPG files by 20% or more, exporting the results in a LEP format (picture.jpg > picture.lep). Point the program at LEP files later and it restores the original JPG file, byte for byte.

The download is a single executable file which runs from the command line. The simplest option is to pass Lepton the file you'd like to process, and it's converted accordingly (JPGs are compressed to LEPs, LEPs are restored to JPGs).

The program doesn't make much effort to check its input. You might expect to run it like this...

lepton mypic.jpg

...but that gives you an error. You must include the ".exe", like this:

lepton.exe mypic.jpg

If you're including a file path with a space, be sure to surround it with quotes, or the program may crash.

lepton.exe "c:\my pics\mypic.jpg"

If that sounds like too much hassle, we've put together LeptonGUI, a very simple front end which accepts files by drag-and-drop. This doesn't have any other functionality, though, so if you're happy with command line testing then the main lepton.exe is all you need.

Verdict:

Lepton.exe delivered very impressive results for us, shrinking our test files by an average of more than 20%, and in a few cases achieving 50% or more.

We wouldn't like to trust it as our sole archiving tool, just in case a bug means some images aren't processed or restored correctly. It's interesting as a proof of concept, though, and if you've lots of images to archive it's certainly worth a look.

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Spotlight: Free Full Software

Windows 10 Fall Creators Update build 1709

Free Full Commercial Software

This is the latest version of Windows - Fall Creators Update. it's a media creation tool that can be used to upgrade an existing installation of Windows or create installation media for another PC. Just make your choice after launching the tool and it'll do the rest.

What was new in Windows 10? The latest release brings back the Start Menu, though with a Windows 8 twist: live tiles keep you up-to-date with the latest news while also providing an easy way to launch apps. (Don't worry if you prefer the Start Screen, it's still there and you can boot into it if you prefer.)

Apps now work much more like regular desktop programs. They have minimise, maximise, restore and close buttons, and can be resized (to a degree) and organised however you like.

If you've still lost track of a program in the mass of open windows, a new Task Spaces feature can help. Click its taskbar button and you'll see thumbnails for everything running now, a little like OS X's Mission Control - just click something to switch to it.

Better still, Task Spaces also supports virtual desktops. Add extra desktops as required and it'll display thumbnails of each one, making it easy to identify whatever you're after and switch to it.

There's also smarter snapping, new customisation options, and even a bunch of experimental additions to the command prompt.

Fall Creators Update brings a whole host of new features for Windows 10. See the Microsoft Blog for more information.

The Windows 10 ISO here will give you build 1607 which is the August 2016 Anniversary Update.

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