Re: [APML] OK - here's your blue Veil Nebula

["bert katzung" <katzung1@home.com>]

Hi Mike:
Yes, I like this one the best of your various versions. Thanks for posting
this stuff. I'm currently reading "Measuring Colour" by Hunt, and "Digital
Color Management" by Giorgianni and Madden, trying to get a handle on these
concepts. Any other reference sources that you would recommend? That CIE
calculator you posted is interesting---when they ask for input of the table
of wavelengths and "emission spectrum," are they asking for the relative
amplitude of the emission at each wavelength or something else? And if
amplitude, should it be normalized to the amplitude at some specific
wavelength? What is the output of the calculator?
Thanks....
Bert

Bert Katzung
katzung1@home.com
www.astronomy-images.com

----- Original Message -----
From: "Mike Cook, AF9Y" <mwcook@concentric.net>
To: <astro-photo@seds.org>
Sent: Monday, 26 November, 2001 5:56 PM
Subject: [APML] OK - here's your blue Veil Nebula


> Chuck and others,
>
>     After a bit of research and discussion, I've come to the
> conclusion that the Veil nebula has no OIII and that my
> mapping into the hot color space was therefore incorrect.
> Based on only Ha/Hb, I've readjusted the mapping and offer
> the following new image:
>
> http://www.webcom.com/af9y/veilrgb.htm
>
>     You can compare it to the Robert Bickel tri-color that
> Chuck made reference to:
>
> http://www.ccnet.com/~rbickel/photo/veil.html
>
>     Of interest is the Ha/Hb mix required to produce the
> pink/violet type color seen in this image.  Here is a
> chromaticity chart showing how the color is produced:
>
> http://www.webcom.com/af9y/chrom.jpg
>
>     Note that it takes a mix of  2.5 parts Ha to 1 part Hb for
> this color range.  You can experiment with other emission
> line mixes using the following CIE calculator:
>
> http://www.flatnet.org/glossary/ciecalculator.htm
>
>
>
> Mike Cook, AF9Y
> http://www.webcom.com/af9y
> mwcook@cris.com
>
>
>
>
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