Please excuse my ignorance, but how exactly do you stack them in Photoshop? I'm familiar wit combining images of different exposures, but how exactly would this work?
Quoting Tom C <[EMAIL PROTECTED]>: > It's when you combine virtually identical multiple exposures, > "stacking" > them to reach a final image that has a total exposure time equal to > the sum > of the individual exposures. > > It's useful in astrophotography for a number of reaons. The main one > is > that a bunch of short, say 6 individual 30 second exposures, can be > combined > The result is the accumulated photons of a 3 minute exposure. The > neat > thing is that tracking error (irregularities in the motor drive or > polar > alignment) can be virtually eliminated, because software > automatically > aligns/registers the individual images so they overlay each other > perfectly. > > The additional benefit we're talking about here is that the sensor > can be > run at both a lower ISO and for a shorter exposure duration, both of > which > reduce noise. > > Tom C. > > > > > >From: "Shel Belinkoff" <[EMAIL PROTECTED]> > >Reply-To: Pentax-Discuss Mail List <pdml@pdml.net> > >To: "Pentax-Discuss Mail List" <pdml@pdml.net> > >Subject: Re: K10D aimed as D200 killer/Translation of interview > >Date: Tue, 31 Oct 2006 15:38:30 -0800 > > > >What's a "stacked image?" > > > >Shel > > > > > > > > > [Original Message] > > > From: Tom C > > > > > It also is likely possible to reduce > > > overall noise by shooting at shorter > > > exposure times and stacking images. > > > The stack will stack up noise just like > > > it does with the signal, but if each > > > stacked image is less than half as > > > noisy as it's double-ISO cousin, > > > results could be favorable. > > > > > > > >-- > >PDML Pentax-Discuss Mail List > >PDML@pdml.net > >http://pdml.net/mailman/listinfo/pdml_pdml.net > > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > > > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
