[ATMoB-discuss] First photo from C14/ST7

[mmotta at massmed.org]

No, No. Do not apply a blur. 
Flat removes donut holes and low frequency stuff from
dust on mirror, etc. Dark does not remove these
hot/cold well enough.
You can not possibly have pixel/pixel tracking, that is
why you still have hot/dark pixels. maxLm has a setting
to remove these. I am sure your other programs do the
same CCD Soft, etc).

Mario

On Tue, 8 Aug 2006 14:17:25 -0400, "Bruce Berger" wrote:

> 
> I may be misunderstanding something. I thought the
dark
> exposures were
> supposed to null out the hot & dark pixels. How do you
> subtract them
> separately? Should I apply a 2-4 pixel Gaussian blur?
> 
> Bruce
> 
> -----Original Message-----
> From: mmotta at massmed.org [mailto:mmotta at massmed.org] 
> Sent: Tuesday, August 08, 2006 1:53 PM
> To: bruce at scopemaker.com
> Subject: RE: [ATMoB-discuss] First photo from C14/ST7
> 
> Choose only those that have tracked well.
> do basic processing on each (Dark/ flatt field/ bias).
> Then, do the hot and dark pixels on each.
> Then, stack your best ones, and do all higher level
> processing (digital
> processing, masking, etc ) on the combined deeper
> stacked image.
> 
> Mario
> 
> On Tue, 8 Aug 2006 13:44:17 -0400, "Bruce Berger"
wrote:
> 
> > 
> > Thank you. So here's a question - I have about 8
> images
> > @ 3 or 5 minute
> > exposures. Should I align and stack, and THEN apply
> Dark & Bias 
> > frames, or should the Dark & Bias be applied to each
> frame before 
> > stacking?
> > 
> > I do not have MaxIm, but I do have Registax, CCDSoft
> 5.0 and Photoshop 
> > CS2.
> > 
> > Bruce
> > 
> > -----Original Message-----
> > From: mmotta at massmed.org [mailto:mmotta at massmed.org]
> > Sent: Tuesday, August 08, 2006 1:35 PM
> > To: valleli at rcn.com
> > Cc: bruce at scopemaker.com; atmob-discuss at atmob.org
> > Subject: Re: [ATMoB-discuss] First photo from
C14/ST7
> > 
> > Look on the black "sky" and you will see single
pixel
> white dots. 
> > Those are hot pixels.
> > Mario
> > 
> > On Tue,  8 Aug 2006 13:19:35 -0400 (EDT),
> valleli at rcn.com wrote:
> > 
> > > 
> > > Mario,
> > > 
> > > I see the dark pixels, no problem. Not sure what
you
> > are referring to
> > > for 'hot' pixels.
> > > 
> > > Is it the mottled (grainy) background?
> > > 
> > > I downloaded the JPG and then viewed it in
> Photoshop.
> > > 
> > > What I saw on the laptop screen had a lot more
> detail
> > in the ring than
> > > this processed exposure shows.
> > > 
> > > Would binning for such a small object have been
> > helpful?
> > > 
> > > Paul
> > 
> > 
> > _______________________________________________
> > ATMoB-discuss mailing list
> > ATMoB-discuss at atmob.org
> >
http://lists.atmob.org/mailman/listinfo/atmob-discuss
> 
> 
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