Re: [APML] OT: Deep M81 (12 Hours) (My image...really!)

["Robert Gendler" <robgendler@worldnet.att.net>]

I only apply the decon to the 16 bit stacked luminance frames in SBIG
format.
I apply the decon after stacking the calibrated luminance frames and before
doing
any other manipulation to the luminance (meaning no levels or curves or DDP
or any
other linear or nonlinear processing)..
Rob Gendler
email: robgendler@att.net
Web Site: http://www.robgendlerastropics.com
----- Original Message ----- 
From: "Kevin Wigell" <kwemail@twcny.rr.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Saturday, March 12, 2005 11:09 AM
Subject: Re: [APML] OT: Deep M81 (12 Hours) (My image...really!)


> Rob, CCDSharp will only read FITS or SBIG formats, correct? How do you get
> your file into one of those formats so that CCDSharp can read it?
>
> Kevin Wigell
> www.kwastronomy.com
>
> ----- Original Message ----- 
> From: "Robert Gendler" <robgendler@worldnet.att.net>
> To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> Sent: Saturday, March 12, 2005 8:04
> Subject: Re: [APML] OT: Deep M81 (12 Hours) (My image...really!)
>
>
> > Bobby,
> > Deconvolution algorthms are complex mathematical formulas that
> > try to approximate what the image would look like without the blurring
> > effects brought on by seeing, mechanical and optical issues. Its much
> > more than a sharpening filter. It does an amazing job of tightening an
> > image
> > but does come at a cost. The image needs to have good S/N as decon
> > will bring out noise in the image, particularly the background
(mottling).
> > The stars will also acquire halos with aggressive decon. One thing I
> > should
> > mention is that for an image to respond well to decon it must be
> > oversampled
> > which is another way of saying it needs to be taken at long focal
length,
> > at
> > least 2000mm. There are ways to deal with the noise such as making a
layer
> > with a nondecon frame to replace the background and stars. The Lucy
> > Richardson algorthms IMO are the best. I use CCDSharp (now free off
> > the SBIG site). I hope this helps.
> >
> >
> > Rob Gendler
> > email: robgendler@att.net
> > Web Site: http://www.robgendlerastropics.com
>
>
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