Stereogram

Stereogram is an easy-to-use program to create 3D effect photos.

Stereograms are pictures or photos with a 3D effect. There are two different images, one for each eye. These images can be superimposed, for example using colour filtering, but you then need special glasses to view them (usually red/blue or red/green). But they can also be two separate images, in which case the colours are much better.

With a stereogram you need to align your eyes to look at the two images separately. You can either focus to a point in the far distance (so that your eyes are almost parallel) and then suddenly place the stereogram into your line of sight, or (this is what I find easiest) go cross-eyed. You will start seeing four images, but then you merge them until you can only see three (there are often dots above the images to help you with this). The middle image then is the 3D one, and with a bit of practice you can focus on that.

Stereogram on the iTunes AppStore

To create a stereogram you need to take two separate photos, one for each eye. The photos should be slightly set apart horizontally, just like your eyes, and the further apart they are the more pronounced the 3D effect will be. To help you with this process, an overlay of the first image will be shown in the view finder when taking the second picture.

Here is a stereogram created with the program: (This image is scaled down; the original size is 1440x752, click on the image to get the full size)

Here are some screen-shots of the app in action:

	This is the view finder — you first take the left-hand picture, which will then turn semi-transparent while you take the right hand one. This helps you with the horizontal alignment, and you can also see the difference between the pictures.
	Once you have taken both photos, they are combined in a stereogram view. With the save button you can save a copy to the camera roll. You will need to do this if you want to keep it. Otherwise, the done button takes you back to the view finder.
	Here is another example of a stereogram from within the app. You might notice one problem with stereograms which are taken with a single camera — things move! When taking the second photo I had to wait for some passers-by to disappear behind the tree (and you can still see some people on the right hand side in the left image). If they are too noticable, they will disturb the 3D effect.

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