Re: [APML] Stacking Lunar Images---suggestions?

[astropix@att.net]

 Roland...

      There's an easy answer here... before you click 'OK' or 'Apply'... 
check 'Preview' and set 'Method' to 'Absolute Difference'. Look at 
the 'Preview' image... the closer to black... the better the registration. This 
is a quick way to determine registration and is covered in the 'White Paper' on 
astrophotography at Digital Light and Color's web-site... and is also in the 
help files *if* you downloaded the full disk info. I, too have some lunar pix 
I'd like to stack this way... let us know how yours turn out!

 Hope This Helps...

 Geoff Powers

     PS... (you have referred to PW pro... mutliple times... as 'Picture Works 
Pro'... you :::DO::: mean Picture Window... correct?)


> I've been working on a series of lunar photos---whole disk shots
> showing the change of phase during a lunar month.  I'm using an Orion
> 127mm Mak-Cas I bought for use as a guidescope; the 1540mm focal
> length is nearly idea for filling a 35mm frame.
> 
> Between first and third quarter, it is pretty easy to get a well
> exposed shot with 200 or 400 speed film.  There tends to be a bit of
> grain with funny color speckles, but averaging 2--4 frames helps to
> clear it out.
> 
> Right now, I'm stacking these with Picture Works Pro, but it is a
> slightly painful process as the "refine" button as often screws up the
> alignment as it improves it.  Plus, when in register mode, there is no
> preview to show me how I'm doing.  After I have finished, I will
> usually take the results and composite them using "subtract" to see
> how well matched they are.  If I didn't get it right, it's start all
> over again.
> 
> Anyone have any suggestions on a better way that involves less
> trial-and-error?  The lack of feedback is the worst part; it's not
> until I'm done that I know if I did a good job and at that point I
> can't go back and just tweak my registration points, I have to start
> all over....
> 
> roland
> -- 
> 		       PGP Key ID: 66 BC 3B CD
> Roland B. Roberts, PhD                             RL Enterprises
> roland@rlenter.com                     76-15 113th Street, Apt 3B
> roland@astrofoto.org                       Forest Hills, NY 11375
> 
> --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
>              Unsubscribe at <majordomo@seds.org>

--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>