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== magnification and resolution == | |||
To find out how big the surface is we are looking at we are capturing a piece of a screen and count the pixels. | |||
We tried an [[wikipedia:iPod|iPod multitouch]] which has a widescreen 960-by-640 resolution at 326 pixels per inch | |||
* resolution 960 x 640 pixels | |||
* actual size 75 x 50 mm | |||
results in | |||
* 0,078125 mm per pixel (or 12,8 pixels per mm) | |||
on our screen capture through the microscope we see 5,5 x 4 pixels. This way we know that we are looking at a surface of 0,4296875 x 0,3125 mm. | |||
==capturing from the webcam== | ==capturing from the webcam== | ||