Re: [APML] M33-LRGB with RG200 and ST7 from Kitt Peak

["Daniel Reyna" <dreyna14@earthlink.net>]

Overall I think that the shot isn't bad.  The background is a bit dark but
still not bad.  One thing that is bugging me is that the lower portion of
the galaxy seems cut off.  The upper right and lower left portions blend
well into the background but the area towards the lower right just ends
though it may just be me.  I think I can see a hint of some of the galaxy's
arms but it may be foreground stars.  Again it's not a bad image Jeff.

Daniel
http://home.earthlink.net/~dreyna14/astro.htm

----- Original Message -----
From: "Jeff Ball" <jeffball@zoominternet.net>
To: "Astro-Photo" <astro-photo@seds.org>
Sent: Wednesday, May 01, 2002 8:09 PM
Subject: [APML] M33-LRGB with RG200 and ST7 from Kitt Peak


> Hello all,
> I got the notion to try and combine my RG200 M33 with an image I took
> from Kitt Peak over 2 years ago.  I spent the night imaging a mosaic
> with Adam Block with the Meade 16" and an ST7.  I believe this was
> Adam's first significant mosaic.  I really did not know what I was
> doing.  I guess it has taken me two years to learn a little about
> processing to do the image justice.  It is no understatement to say that
> I had to shape some stars manually.  There were some very large seagulls
> from the Meade scope.  Certainly not from the AP<g>  I believe the focal
> reducer was the culprit for the poor off axis images at the time.  I
> could be wrong about that.  The RG200 was taken at Cherry Springs SP
> with the AP 130EDT.  I used Rob Gendler's LRGB technique.  I hope it is
> appropriate to post here.  I also had to remove some red halos.  There
> are some data gaps.  You will see large black areas with no stars.  I
> guess I should go ahead and copy and paste some stars since I have
> manipulated the image so much already<g>  We just did not cover the area
> when we did the mosaic.  Links at the webpage to the individual
> luminance and color image.  I basically combined the images and did the
> star shaping.  Little else.  I thought all of the smoothing techniques
> just took away from the bright star clusters in the arms.  The image may
> be a bit dark.  I am really having trouble with luminosity as my monitor
> warms up.  Please let me know if the image is too dark or too light.  I
> do want to error toward dark since I do have the data gaps with no
> stars.  The luminance core may be burned out.  I did not know how to
> work with the data when I worked on the luminance and mosaic.  The core
> is a mask to cover the burned core.  Thanks for any tips.
>
> http://www.astro-photography.com/M33_ccd_lrgb.htm
>
> Jeff Ball
> www.astro-photography.com
> Ohio Valley Astronomical Society
> www.ovas.org
>
>
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