Interface PTLens's bare-bones interface uses a single window, and its non-standard control layout makes using it less intuitive than more polished apps. On first run, you choose your language from a dropdown, and are informed how many processors are in you system, e.g., 4 for a quad core.

When I run this, it asked me if I wanted to additionally install PTLens as Photoshop and Photoshop Elements plugins, which is a help. The Windows download is a ZIP you have to extract, and then you run a standard MSI that takes you through an installation wizard. You can also install PTLens as a Photoshop plugin, for Photoshop versions back to CS3. The installer is a tiny sub 4MB download. The Windows version works with OS versions all the way back to Windows 2000 or later, while the Mac one works on 10.5.2 and later systems. A trial version only lets you work on 10 images. Installing PTLens is available for both Windows and OS X PCs, though the Windows version is at 8.9, while the Mac version is still at version 1.6. Let's see whether this $25 single-task program can still keep up with the big boys of photo adjustment. PTLens's home page claims that it was the first software to automatically correct these kinds of lens distortion. Lens physics also comes into play with chromatic aberration-those color fringes at high contrast edges, and with vignetting-the effect of darkening at the edges of the photo. This kind of correction is particularly important when it comes to geometry issues introduced by lens optics, such as pincushion (from wide-angle lenses) or barrel distortion (from telephoto lenses). Camera calibration software maker DxO is a leader in this field, too, with its DxO Optics Pro 7.

The foremost exponent of this technology has, unsurprisingly, been Adobe, with its Photoshop CS6 See it at Amazon UK and Lightroom 4 £9.98 Per Month at Adobe UK apps offering leading lens-profile-based image corrections. If you care about getting your digital photos correct-that is, looking as close to the scene you saw before you-lens-profile-based image correction is your ally. Best Hosted Endpoint Protection and Security Software.

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