Test this with you webcam now

I have created a Flash application wich demonstrate this. It uses your webcam as the camera and your computer screen as the background. 

click here to test this. 

Taking the pictures

In order to make transparent photos you have to take 2 shots of the same object on a black and on a white background :

 The picture have to be taken exctly on the same position : the camera and the object mustn't move.

Generating the alpha channel

 To create the alpha chanel you have to compare the two pictures : If a pixel is the same on the two pictures then it must stay opaque if it changes then it must be transparent.

Generating the black and white pictures

As we are working on a black and white background we will compare the two pictures on their luminosity

Comparing the pictures

To  compare the pictures we'll have to invert one of the pictures then substract them.

Inverting

Substraction

When you substract the two pictures you have the following image in result :

This image can be used as the alpha channel of one of the 2 pictures taken to add transparency. 

Test with an actual photo

Original shots

Final image 

Test this with you webcam now

 I have created a Flash application wich demonstrate this. It uses your webcam as the camera and your computer screen as the background.

click here to test this. 

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