What's the theory behind "x-ray pics"

[Kube]

I've seen so called "x-ray"pics.

See link

http://voy.voyeurweb.com/main/vod24/VS57786tea/index.html

Is it just using a filter that eliminates color detail and emphasizes shape and contour?

[clemente]

Those just look like black and white pics.

[joshd2012]

Basically, they use special filters to bring out details underneath the clothing. If you look at those pics, you will notice camel toe and nipples, but when they were shot, those features were not scene. Usually they use nightvision filters.

[Mr. Salty]

Speaking as a former professional photographer, judging from the tone of the foliage, I'd say the photographer may have used infrared film.

[Jackskeleton]

nothing special. and considering people wear less and less as a swimsuits now a days.. do you really need x-ray to enjoy yourself?

[innocentfreak]

It was most likely the Sony filter released a while back for one of its video cameras. It was an infared/nightfilter that was discovered to have an x-ray effect when used during the day. It was immediately pulled from shelves but they are still out there.

[Pistol Pete]

The way it is done is simple. CCD imaging sensors are normally very sensitive to near-infrared energy. Because of this sensitivity, an unfiltered outdoor CCD image looks starange. Foilage is washed out to grey and the color detail is lost due to excess IR energy from the sun.

Camera manufacturers add a filter to remove this IR energy. This fliter appears clear to the visible eye, but is opaque at infrared frequencies and therefore removes the IR light. This helps correct the image colors and reduces washout.

Now if this infrared filter is removed and an infrared pass filter (appears opaque to the visible eye, like the window on the end of many remote controls) is added to the lens, you have a camera that is sensitive to infrared light and blocks visible light. This is what the infamous Sony NightVision camera does.

Some materials pass IR energy more easily than visible light energy. Many synthetic materials, such as nylon or lyrca, exhibit this property. Hence the see-through bikini but the opaque cotton t-shirt. It takes a lot of energy to penetrate these materials, so most "x-ray" pictures will be taken outdoor with the sun as a huge IR floodlight.

The easiest way to build your own IR camera is to find a B/W CCD security camera (even those little cameras sold for $30 shouldl work) remove the glued-on IR block filter, then tape an IR pass filter or the darkest red lighting gel you can find on the lens.


BTW, I work with these cameras for legitimate purposes. I pretty much have to agree with Jackskeleton on this one.