Re: [APML] NGC 3953 using LLRGB technique

["John C. Mirtle" <jmirtle@shaw.ca>]

Thanks for posting Rob;
    Inspirational AND educational! Beautiful image, thanks for your
documentation. I am surprised that after your initial image reduction, and
before the LLRGB, that you only go through a LR stage with the luminance
channel. For some reason I was expecting many more stages of image
manipulation. In other words, other than the LR and LLRGB steps, what you do
to the image isn't much different from what many of us are already doing.
This is definitely food for thought. I have some old C14 galaxy colour/tech
pan pairs I need to have another look at......

John Mirtle
Calgary, Ab. Canada

----- Original Message -----
From: "Robert Gendler" <robgendler@worldnet.att.net>
To: <astro-photo@seds.org>
Sent: Saturday, April 20, 2002 7:28 AM
Subject: [APML] NGC 3953 using LLRGB technique


> Hi all,
> OK I'll try to do this a lttle differently <G>.
> I've uploaded a new image of NGC 3953, a nice
> spiral in Ursa Major. The image is at:
> http://www.robgendlerastropics.com/3953.html
> I used the "LLRGB" technique to bring up the rather
> weak color data. The processing steps are outlined below.
> 1)Calibration, stacking, and RGB composite in Maxim.
> 2) LR applied to Luminance in AIP.
> 3)RGB and Luminance saved as 16 bit and brought up
> in PS where curves, levels applied and converted to 8bit.
> 4)First LRGB created using layers in PS. Opacity brought
> to 50% and image flattened. Additional saturation (30%)
> and gaussian blur (1.7 pixels) applied. This image was then used as the
> "new" RGB and two more additional rounds of the same were performed
> which very significantly enhanced the color data. If anyone is interested
in
> the details of the technique my LLRGB article can be found at
> http://www.robgendlerastropics.com/LLRGB.html
> Rob Gendler
> Email: robgendler@att.net
> Web site: http://www.robgendlerastropics.com/



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