GREENLAND'S ICY MOUNTAINS REVEALED - DIGITALLY
How digital image enhancement improved photos taken through aircraft windows
by Captain Dave Pattison


LEFT: the original 35mm Kodachrome transparency lacks definition and saturation. In fact it looks just as you might expect from a shot taken through an aircraft window at 35,000 feet.
RIGHT: the same shot after digital manipulation. By selectively adjusting the saturation, gamma and sharpness, the picture springs into life.


Many pilots are keen photographers and always carry a camera with them on trips. Like many pilots I have a large collection of photos; some I am rather proud of and some I know I should have junked years ago. You probably have some too. It's always difficult to trash pictures that are almost right - you think to yourself that if only some aspect of the shot had been better, it would have made a great photograph. In the back of your mind you harbour a hope that one day, when you have the time, you will do something with them. Well, that day is closer than you might think!

For example, I have always been disappointed by my attempts to take photographs through aircraft windows - even the supposedly optically true flight deck windshields. The reasons are not hard to figure out. Apart from the problems of shooting through at least six or seven miles of atmosphere, there are the added complications of trying to take pictures through just about the soggiest photographic filter ever designed. About one and a half inches of multi-layered glass and acrylic, a microscopic coating of gold film and the distortion of the screen due to aircraft pressurisation, makes taking decent photographs nigh on impossible.

Over the years, despite the drawbacks of photography through the 'optical soup' of the flight deck window, I have taken quite a few shots from the air. I must admit they're not exactly of the highest technical quality, but I've held on to them nevertheless, in the hope that someday something could be made of them. As I shall explain, for me that someday has finally arrived.


One of the sights I have often tried to capture on film is the coast of Greenland, which is sometimes visible on northerly crossings to the USA and Canada. Unfortunately, the passengers hardly ever get to see this amazing coastline because at this stage of the flight the window blinds are down and the movies are running. More's the pity because it is a truly amazing spectacle. Frozen sea, icebergs, deep fjords, glaciers, jagged mountains, ice deserts and nunataks make this a place like nowhere else on Earth. Better than any movie.
Until fairly recently, photographers had to rely upon the skills of talented darkroom technicians to rescue their flawed pictures. With the advent of digital imaging, all that has changed, even for the amateur. Now any photographer with a computer can easily manipulate and enhance pictures, even beyond what was previously possible in the darkroom. It was to this technology that I turned in an attempt to rescue some of my shots of Greenland.

Basically, all that is required is to get the picture into a form that a computer can handle - and that means digital. High quality digital (filmless) cameras are becoming available; they are expensive, but no doubt prices will fall eventually. In the meantime, a 'normal' film image can be digitised by scanning it from a negative, transparency or print. Alternatively, your photographs can be transferred from film onto Photo CD. Each Photo CD holds at least 100 images. There are many bureaux offering this service, and it's also available at many labs at the time of getting your film developed.




Nunataks. Jagged mountain tops protruding through thousands of feet of solid ice.

Once in the digital domain, anything goes. With the help of some very clever software the image can be manipulated in very much the same way as a darkroom technician would, except that no darkroom is needed - all the work is done in real time on your computer monitor. At the click of a button it's possible to adjust the saturation, hue, contrast, brightness, sharpness, colour balance, remove dust and scratches and do a great deal more besides. And it's just as straightforward to apply special effects to the image. It really is easy, and anyone can do it. Experience and a 'photographic eye' do help of course, but there are no hard and fast rules; it's simply a matter of experimenting with the various tools and filters until things look right. Even in these days of high-tec computerised photography, it's nice to know there is still no substitute for the Mk.I eyeball.

If you need a print and true photo-realistic quality is required, the computer file can be sent to a bureau for printing. However, many home computer printers are quite capable of producing prints of at least good proof quality.




Eastern Greenland's fjords and mountains appear sharp and crisp after digital enhancement using Adobe Photoshop

The accompanying pictures started life as 35mm Kodachrome transparencies, all taken through aircraft windows from high altitude. I scanned them on a Kodak RFS 2035 Scanner, and the enhancement was done using Adobe Photoshop on an Apple Macintosh LC475 computer with 20Mb of RAM and a 160Mb hard drive. The results are way beyond what I could have achieved in the darkroom - and these are amongst my first attempts at digital imaging.

Of course, the power of digital imaging is not restricted to rescuing soggy snapshots. The technique is being increasingly used by professionals as a more creative (and less polluting) alternative to chemical photography. And when it comes to restoring treasured but damaged family photos, removing scratches and blemishes, correcting colour casts, adding or removing people from pictures and so on, digital imaging has all the answers. There can be little doubt that in the not too distant future, all photography will be digital and film will be a thing of the past.

Many flight crew members regularly use home computers, and you only have to peruse the pages of the Log to realise that many have considerable photographic talents. If you're like me, you probably have drawers full of pictures which don't quite make the grade. Nowadays, for a fairly modest outlay you can purchase a good scanner - complete with software - hook it up to your PC or Mac, and start turning out professional results.




This article first appeared in "The Log" - the journal of the British Airline Pilots' Association - August 1995.
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