Re: [APML] Northern Milky Way

["Jim Ives" <flyboy9990@earthlink.net>]

Jerry good to see a new shot from you!  Your wide field work is second to
none.
Jim Ives
----- Original Message ----- 
From: "Jerry Lodriguss" <jerry@astropix.com>
To: <astro-photo@seds.org>
Sent: Monday, July 21, 2003 6:05 AM
Subject: [APML] Northern Milky Way


>
> I've added a picture of the Northern Milky Way to my web site:
>
> http://www.astropix.com/HTML/SHOWCASE/NMW.HTM
>
> It's a 24mm shot of the Milky Way from Cygnus to Cassiopeia.
>
> Two original exposures were made with a Nikkor 24mm f/2 lens working at
> f/4.5. One exposure was for 52 minutes with no filter, and one was for 45
> minutes with a soft focus filter.
>
> The images were scanned with a Nikon LS2000 scanner at 2700 pixels per
inch
> with Digital ICE applied and 2x multi-sampling at 12 bits with color
> management turned off in the NikonScan software. They were imported as
> 16-bit TIFFs into Photoshop, and the LS2000 color space profile was
> assigned to the TIFF file and it was saved with the profile embedded.
>
> The two original image scans were then registered in RegiStar in 16 bits.
> The images were opened in Photoshop and converted to 8 bits and then
> composited together with the Apply Image command using screen, mask,
invert.
>
> The composite image was then separated into the component red, green and
> blue channels in Registar, and registered again to remove the lateral
> chromatic aberrations in the corners of the image. The individual channels
> were then recombined into an RGB color image.
>
> The black points were then set in the individual color channels in
> Levels  in Photoshop and the color of the sky background adjusted with
Curves.
>
> A brightness and color gradient were then removed in Photoshop by creating
> a soft light layer filled with 50 percent gray that was filled with a
> linear gradient to remove the brightness and color gradient in the image
> from light pollution.
>
> The image was then re-sized to 825 x 558 pixels and sharpened with an
> Unsharp mask of 100 percent, 0.5 pixels and 0 threshold levels.
>
> Finally, a Smart Blur with a radius of 5 pixels and a threshold of 15 was
> applied.
>
> The image was converted to sRGB color space and saved with a JPEG quality
> setting of 9.
>
> Jerry
>
>
> The book "Photoshop for Astrophotographers" is now finished!
>
>   Go to: http://www.astropix.com/PFA/PFA.HTM
>
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>

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