Re: [APML] The Halo of the Dumbbell

[Brian Sledz <brianhome@linkus.net>]

Rob,
That is very nicely done.  Thanks for the steps too.  You really captures a 
lot of ha surrounding the nebula.
Brian

At 06:11 AM 7/18/2003 -0400, you wrote:
>Hi all,
>I've uploaded a new image of M27 capturing the extensive
>outer halo of faint emission using 8 hours of hydrogen-alpha
>exposure plus several hours for the RGB component.
><http://www.robgendlerastropics.com/M27HA.html>http://www.robgendlerastropics.com/M27HA.html
>
>I realize this was done before by Roland but it was fun
>and a real challenge to do.
>
>The processing steps were roughly as follows
>
>1) After combining the h-alpha frames DDP was applied in Maxim.
>2) The 16 bit file was then processed aggressively in photoshop
>using multiple rounds of curves, and levels to enhance the faint
>halo.
>3) H-alpha was then combined with the G and B channels.
>4) A luminance was made from a composite of the HA data (#1)
>and a LR processed version for the central region (5 iterations).
>5) Unsharp mask was applied to the luminance.
>6) LRGB was then made in PS.
>7) A "minimum filter" was applied to the "red" channel to reduce
>the numerous little red stars and red halos that result from the above
>process.
>8) Finishing touches were applied in PS.
>
>Rob Gendler
>Email: <mailto:robgendler@att.net>robgendler@att.net
>Web site: 
><http://www.robgendlerastropics.com/>http://www.robgendlerastropics.com/
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