Re: very long sparks

• To: tesla-at-pupman-dot-com
• Subject: Re: very long sparks
• From: "Jeff W. Parisse" <jparisse-at-teslacoil-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Tue, 11 Jan 2000 11:55:21 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Antonio,

Its a digital artifact due to "sharpening" techniques such as
PhotoShop's Unsharp Mask or the optical equivalent. It's a
form or contrast enhancement that affects high contrast
borders (such as a bolt against a dark background) and
produces the effect you observe.

Jeff Parisse
www.teslacoil-dot-com


> Interesting observation. I note in that picture another feature that I
> frequently see in spark images: There is a dark area at the borders of
> the image of the spark channel. Imaging artifact, or some real
> phenomenon?
> 
> Antonio Carlos M. de Queiroz

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