RE: [APML] OT (slightly) M82 Reds

["Chris Schur" <cschur@therim.com>]

Scott, if you fill the tech pan shot with "darken" a deep red color, you'll
get an image you can combine directly with "lighten" with your supra image.

Chris

-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Scott Hammonds
Sent: Sunday, March 21, 2004 7:42 PM
To: 'Discussion of Film Astrophotography'
Subject: RE: [APML] OT (slightly) M82 Reds


Chris,
That is really a very nice shot of M82. Thanks for the information on
combining shots. I can't wait to give it a try with Tech Pan and a Supra 400
shot. The Supra is nice but a bit grainy, hopefully this will help with that
problem.


Scott Hammonds
www.creatorsview.com


-----Original Message-----
From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org] On
Behalf Of Chris Schur
Sent: Sunday, March 21, 2004 5:58 PM
To: APML
Subject: [APML] OT (slightly) M82 Reds

Hi all,

I used a technique I developed for film imaging when combining red filtered
tech pan images with color supra 400 shots for this CCD image.  I wanted to
share with you the result so you can try it too on your film shots.  The
method combines a deep Ha or red filtered shot with a white light color
image.  Rather than just add them and combine using the LAB method, (Ala
Gendler), I first adjust both images in PS to be same background density,
and a good appearance for to be a decent shot on its own.  Then I paste one
over the other (after registering!).  I combine the layers with lighten.
What happens is really cool - the white light image has the bright stars,
blue nebs and stellar core.  The Ha shot has the bright Ha regions and a
host of IR stars.  Combining with Lighten does this:  the brightest of both
shots becomes the final image.  So in that final image, you get it all - a
great white light color image with enhanced Ha nebs and lots of neat IR
stars all over.  Here's a (gulp) CCD shot using this exact technique.  I
hope you can use it on your film shots!

http://www.psiaz.com/schur/astro/ccdimagepages/m82-2.html


Take Care,

Chris Schur


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