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Re: [APML] Northern Milky Way
Jerry, amazing - the step-by-step is REALLY helpful.
Stuart
Jerry Lodriguss wrote:
>
> 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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