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For instance, this image:

enter image description here

shows human eyelashes close up.

The lashes look green, in fact the whole surface area has a strange tint of green Why is this?

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Sounds like a heavy application of mascara! – Trevor Alexander Dec 26 '13 at 5:33
up vote 12 down vote accepted

It seems that it is an electron microscope image. It doesn't use photons, but electrons. So the image has been coloured digitaly.

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+1, but why are the digital colors green? – shortstheory Dec 26 '13 at 9:36
"Colored digitally" here means that the color has been artificially added to the image after the fact. Green is simply what this artist happened to choose. – David Zhang Dec 26 '13 at 9:59
Also green has maximum response of the human eye.So it helps to give contrast to the detail. – Sandesh Kalantre Dec 26 '13 at 13:24
Thanks guys, this really cleared things up. – user36305 Dec 26 '13 at 23:50

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