Re: [APML] A Different View of Venus' Atmosphere?

[Steve Lindsey <stevelindsey@earthlink.net>]

Juan,

What filter did you use on the scope for these images?

Steve

-----Original Message-----

Subject: Re: [APML] A Different View of Venus' Atmosphere?

Hi Kevin,

No, it is *not* the atmosphere what you're noticing on that image; it's
actually a processing artifact. The problem with this image is a horrible
bright ring around the Venus disk that appears when the image is processed
to enhance structures at specific characteristic scales (wavelets, unsharp
mask, etc.). The workaround to this problem is to remove the planet's disk
(replacing it with something "neutral"), process the image, and then
reinsert the disk with the help of masks. It's just the inverse problem to
processing an image avoiding black rings around bright stars. The image
shown is a quick processing, where we haven't done our best. We are
reprocessing this image and soon we'll release a new version without the
"pseudo-atmosphere" artifacts <g>.

We are indeed convinced that the bright arc shown on Jerry's image and ours:

http://pleiades-astrophoto.com/2004/venus_transit/venus_transit_2.en.html

*is* the atmosphere. I am processing more videos right now; let's see if
this feature persists between the third and fourth contacts.

Regards,

Juan Conejero
-- 
-------------------------------------------------
Juan Conejero, Pleiades Astrophoto
juan.conejero_at_pleiades-astrophoto.com
http://pleiades-astrophoto.com/
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----- Original Message ----- 
From: "Kevin Wigell" <kwemail@twcny.rr.com>
To: "APML" <astro-photo@seds.org>
Sent: Thursday, June 10, 2004 7:42 PM
Subject: [APML] A Different View of Venus' Atmosphere?


Congratulations, Jerry, for your accomplishment.

I'm surprised no one else has brought this up, but it appears to me that the
image posted by Vincent Peris and Juan Conejero,

http://pleiades-astrophoto.com/2004/venus_transit/venus_transit_1.en.html

also shows Venus' atmosphere, albeit in a different manner. Something is
causing the granulation on the solar surface to look different near Venus.
This is most apparent in the hi-res version of the image.

Is this an imaging artifact, or an effect of Venus' atmosphere?

Kevin Wigell
www.kwastronomy.com

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