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

[Christopher Go <christone@pacific.net.ph>]

Juan,

When processing my solar images I noticed that using wavelets created a lot 
of artifacts.  I just used unsharp masking for my images.  This is a 
problem we have with software processing.  At time, one can't tell what is 
real and what is an artifact.  The best is to analyze the raw images.

Regards,

Chris

At 06:49 AM 6/11/2004, you wrote:
>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/
>-------------------------------------------------
>
>
>----- 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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Christopher and Vicky Go
Christone Industries
Manufacturer and Exporter of Quality Fossil Stone and Wrought Iron Furniture
Cebu, Philippines
http://www.christone.net 

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