Re: [APML] Northern Milky Way

["Stan Richard" <stanrichard@hotmail.com>]

Jerry, that is a beautiful wide-field shot.  Your image processing workflow 
is quite involved, thanks for including that.  Is this workflow explained in 
detail in your book?

Thanks.



Stan Richard
Events in the Night Sky
www.nightskyevents.com





>From: Jerry Lodriguss <jerry@astropix.com>
>Reply-To: Discussion of Film Astrophotography <astro-photo@seds.org>
>To: astro-photo@seds.org
>Subject: [APML] Northern Milky Way
>Date: Mon, 21 Jul 2003 06:05:59 -0400
>
>
>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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