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

[<pleiades2004@pleiades-astrophoto.com>]

Dale,

I have written a document where I try to show the techniques employed to
process one of our transit images. I think this work demonstrates that the
arc feature (which I believe is the atmosphere of Venus) is real and has
indeed been recorded by the original image. With some restrictions, the
techniques described are applicable to film astrophotography, so I think we
are not going too much out of topic with this discussion:

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

The document is a bit technical but I hope it will give a good description
of our processing work.

Regards,

Juan Conejero

-- 
-------------------------------------------------
Juan Conejero, Pleiades Astrophoto
juan.conejero_at_pleiades-astrophoto.com
http://pleiades-astrophoto.com/
-------------------------------------------------

----- Original Message ----- 
From: "Dale Ireland" <direland@drdale.com>
To: <astro-photo@seds.org>
Sent: Thursday, June 10, 2004 11:16 PM
Subject: Re: [APML] A Different View of Venus' Atmosphere?


> There are three types of atmosphere shots I have seen.
>
> One is basically unmanipulated shots that are very over exposed for the
Sun
> but show the atmospheric ring.
> Second are combinations of long exposures and short to keep the solar disk
> looking normal and also show the ring.
> Third are heavily stretched and processed short exposures that show the
Sun
> properly exposed but have been worked on to bring out the ring.
> I think quite a few of the third type have used way too much edge
sharpening
> and unsharp mask to produce a "pseudo-ring" where none was visible or
> actually photographed.
>
> Just my opinion
>
> Dale


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