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Extensis pxl SmartScale

Lots of Hype — High Price — Little Substance

As photographers we all want magic solutions — the lens that's sharper than any other, the 6MP digital camera that will outresolve the 11MP model that costs 5X as much. Or, the software program that will allow us to enlarge our files to huge sizes with no loss in quality. Psychologists call it "magical thinking", and most of us fall prey to it sometimes. Indeed manufacturers count on it when they try and sell you products that overpromise but underdeliver.

Extensis pxl SmartScale is a USD $199 Photoshop plug-in (Mac OSX & Windows) that promises a lot — "Users can now scale images up to 1600% with no discernible loss in printed quality" — says Extensis. But can the product really deliver?

What's it For?

SmartScale is designed to allow image files to be scaled upwards. Why would one want to do this? Three reasons, usually. The first is because the original file is small or low resolution. Images taken with the 1 to 3 Megapixel cameras of the late '90s needed to be "ressed-up" to make anything more than wallet sized prints. Today's 4-6 MP digicams though produce images large enough for most purposes, so that the need to res-up is reduced from what it once was. The second reason is if a small segment of an otherwise normal sized file needs to be extracted and enlarged. The third reason is to take a typical file and enlarge it so that a very large print, such as a poster or billboard can be made.

In Use


Installation is straightforward. But, I was disconcerted to see that instead of installing itself as a normal Photoshop plug-in, the installation process created a new top level Photoshop menu item between Window and Help, called Extensis. See Figure 1 above.

This is simply bad behavior. What if every product did this? That's why Adobe has a top level menu item called Filter which contains an area for third party plug-ins to be found. A negative first impression was immediately created.

Fig. 2

With SmartScale you have the choice of working on an image currently on-screen in Photoshop, or one that's still on disk. The image is previewed and the menu palette seen in Figure 2 above is available. You can choose how to rescale the image in a number of different ways; as a percentage, by absolute size or with a slider. There are also some quality choices available under the Detail menu. More on these a bit further on.

On Test

Below is 20 MB image, cropped from the original 47 MB, 8 bit file, taken with a Kodak DCS Pro 16 Megapixel back on a Contax 645, using a Zeiss Sonnar 210mm f/4 lens, using ISO 100, a heavy duty tripod, mirror lock up, optimum aperture (f/8), high shutter speed, and exact focus. Needless to say, image quality is superb, about as good as one can expect from current optical and digital technology.

Fig. 3

Below are extreme enlargements done using SmartScale, and also Genuine Fractals 2.0, the normal bicubic interpolation built into Photoshop, and bicubic again but using the 10% increment technique. (With this technique the image is ressed-up 10% at a time until the desired size is achieved. Some people believe that this produces somewhat better results than doing it in one shot). Note as well that the version of Genuine Fractals that I have available is an older one. The current version is 3.0, but I can't comment on whether it does a better job or not than the earlier V2.0. I would imagine that it's either the same as or slightly better than the 3 year old version.

Genuine Fractals 2.0
Bicubic Interpolation in Photoshop 7
Bicubic Interpolation in Photoshop 7
in 10% increments
Fig. 4

Below in Figure 5 is a version produced with SmartScale, but with the settings available under the Detail menu adjusted to try and achieve a "softer" interpretation.

Fig. 5

I experimented with these settings, following the manual as well as doing some free-form experimentation, but couldn't do much to improve the image beyond what a bit of post-processing Gaussian Blur would have done.


What I see above, and borne out in several tests with other files at other magnifications, is that both SmartScale and Genuine Fractals do a slightly better job of ressing-up an image than does the built-in bicubic interpolation function in Photoshop. This can best be seen by looking at the rim of the hat where it contrasts with the man's face. With both SmartScale and Genuine Fractals the edge is less ragged. Bicubic, and Bicubic with 10% increments look essentially identical, and both are not far behind the commercial products in image quality. Naturally, prints display pretty much similar results as seen with the web reproductions above. There's no free lunch — not even when it's expensive.


SmartScale sells for USD $199. Genuine Fractals sells online for USD $159. Bicubic interpolationImage / Image Size in Photoshop, costs nothing.

As shown above, SmartScale and Genuine Fractals have a small quality edge over Bicubic. SmartScale's advantage over Genuine Fractals is that it works in a single step, without needing to save and then re-load the image in a special format.

Frankly, if SmartScale cost under $50 and didn't install itself in an inappropriate manner I might find it marginally worthwhile. But at two hundred dollars it is overpriced for what it does, or in this instance doesn't do. With powerful and demonstrably productive programs like Neatimage at $59, and FocalBlade at $49, to find SmartScale at $199 when it doesn't do an especially good job can only bring to mind the phrase — caveat emptor.

Not recommended.

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Concepts: Normal distribution, Interpolation, Bicubic interpolation, Multivariate interpolation, Bilinear interpolation, Lanczos resampling, Image editing, Human penis size

Entities: Adobe, Kodak, OSX, Windows, Michael Reichmann, Photoshop

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