Sunday, May 30, 2010
Astro anarchy gets published
NGC 6888 in HST-palette at National Geographic's "Daily Dozen"
May - Week 4
My image of the "crescent Nebula", NGC6888, was selected in a
"Daily Dozen" of National Geographic Magazine's webpage.
This was the selected image. Original post with details can be found HERE.
You can vote my image to be printed in National Geographic magazine.
Please, use this link to give a vote:
Saturday, May 29, 2010
M16 experiment, narrow band with a Broad band luminance.
HST-palette colors with a Broad band luminance. RGB-Stars.
Red=S-II, Green=H-a and Blue=O-III
Natural color narrow band composition with a Broad band luminance. RGB-Stars.
Red=70%Ha+30%S-II, Green=O-III and Blue=70%O-III+30%H-alpha.
In this experimental image, I have tested the method to use a clear filter luminance with a narrow band color. This is (only?*) scientifically correct method to use a luminance image with a narrow band colors, since a broad band luminance contains all the wave lengths used for color information.
I don't usually like to mix colors from a different imaging methods, like pure RGB and narrow band. In this case I have used RGB, real color, stars with an emission line image.
I don't usually like to mix colors from a different imaging methods, like pure RGB and narrow band. In this case I have used RGB, real color, stars with an emission line image.
Some astro imagers tend to use H-alpha channel as a luminance, due the higher details and better S/N than any other channel has. Even though the visual appearance might look better, other channels, O-III and S-II, has no information in H-a luminance and all details in there are lost!
(*I have to point out, I use H-a luminance with a many NB images but H-a is boosted with all the information in O-III and S-II channels used. I call this method "Tone Mapping". Step by step instructions can be found here: http://astroanarchy.blogspot.com/2009/04/neaic.html )
The original narrow band image, with technical details, of M16 can be found here:
http://astroanarchy.blogspot.com/2010/05/m16-eagle-nebula-in-hst-palette.html
Technical details
Imaged with a Northern Galactic members remote telescope in Australia, https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhT5xcPgdl42zGREyCwydFYagJMAi08LFbJBf0G3CN2kmyirDNtFbaj3xJ_bmA93X2t1nxBQX4uTWobfRYnYLT3TiqNZVZMbdW7hVlAVGWRYnTRndCGV9zhHmxvyEAHSz3sVHzVefaXEFg/s1600/NGTelescopeL.jpg
16" RCOS ja Apogee U9000 camera.
LRGB combo.
H-alpha 5x1200s, O-III 2x1200s, S-II 2x1200s . Dark and Flat calibrated.
Broad band luminance 15x300s.
RGB-colors Red 2x300s, Green 2x300s and Blue 2x300s.
Raw data is shared with Petri Kehusmaa and J-P Metsavainio
Processing workflow:
Image acquisition, MaxiDL v4.xxx
Stacked and calibrated in CCDStack.
Deconvolution with a CCDSharp, 30 iterations.
Deconvolution with a CCDSharp, 30 iterations.
Levels, curves and color combine in PS CS3.
Friday, May 28, 2010
New target from the Australian Sky, M8
M8, the "Lagoon nebula" in Constellation Sagittarius.
New project, from Northern galactic remote telescope in Australia, has been started.
The Lagoon nebula, M8, in ionized Hydrogen light, H-alpha.
The telescope and technical information:
16" RCOS ja Apogee U9000 camera.
LRGB combo.
H-alpha 4x1200s, Dark and Flat calibrated.
Raw data is shared with Petri Kehusmaa and J-P Metsavainio
Processing workflow:
Image acquisition, MaxiDL v4.xxx
Stacked and calibrated in CCDStack.
Deconvolution with a CCDSharp, 30 iterations
Levels, curves and color combine in PS CS3.
Levels, curves and color combine in PS CS3.
Wednesday, May 26, 2010
M16, reprocessed
M16, the "Eagle nebula"
Close up.
I did this one again, since I carried away with processing at previous version!
"Less is more" as usually.
I haven't used to process so good data, than the Northern Galactic members telescope delivers.
-
imaged with a Northern Galactic members remote telescope in Australia, https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhT5xcPgdl42zGREyCwydFYagJMAi08LFbJBf0G3CN2kmyirDNtFbaj3xJ_bmA93X2t1nxBQX4uTWobfRYnYLT3TiqNZVZMbdW7hVlAVGWRYnTRndCGV9zhHmxvyEAHSz3sVHzVefaXEFg/s1600/NGTelescopeL.jpg
16" RCOS ja Apogee U9000 camera.
LRGB combo.
H-alpha 5x1200s, O-III 2x1200s, S-II 2x1200s . Dark and Flat calibrated.
Raw data is shared with Petri Kehusmaa and J-P Metsavainio
Processing workflow:
Image acquisition, MaxiDL v4.xxx
Stacked and calibrated in CCDStack.
Deconvolution with a CCDSharp, 30 iterations.
Deconvolution with a CCDSharp, 30 iterations.
Levels, curves and color combine in PS CS3.
Narrow band lines are mixed to a HST-palette (Used generally with Hubble Space Telescope)
Red=S-II, Green=H-alpha and Blue=O-III
-
Original Blog post here, processing looks little heavy handed:
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