I have colorized my 140 minute H-a image of the Tulip Nebula, a/k/a Sharpless 2-101. I have decided that some emission nebulae H-a images respond well to colorization, whereas others look much better in monochrome. I think that the Tulip nebula looks better colorized.
I somehow feel the need to defend H-a colorization: The H-a filter passes only red light, so the colorization merely depicts what the camera would have seen if it were not colorblind. I concede that the fainter stars were mistakenly colorized in my image, and hope in the future to learn how to avoid that.
Colorized and monochrome versions viewable at
http://home.att.net/~dpersyk/new.htm
The image was taken with a Takahashi E-160 (f/3.3) astrograph aboard an AP-1200GTO. The camera was an SXV-H9, and the exposure was 14 x 10 minutes. Guiding with an MX-716 and NP-101. Astrodon 6 nm FWHM H-a filter. Acquisition AA 3.0, processing in ImagesPlus, colorization with Noel Carboni’s Astronomy Tools actions.
Thank you for visiting my site.
Clear skies,
Dennis Persyk
Igloo Observatory Home Page http://dpersyk.home.att.net
Hampshire, IL
I somehow feel the need to defend H-a colorization: The H-a filter passes only red light, so the colorization merely depicts what the camera would have seen if it were not colorblind. I concede that the fainter stars were mistakenly colorized in my image, and hope in the future to learn how to avoid that.
Colorized and monochrome versions viewable at
http://home.att.net/~dpersyk/new.htm
The image was taken with a Takahashi E-160 (f/3.3) astrograph aboard an AP-1200GTO. The camera was an SXV-H9, and the exposure was 14 x 10 minutes. Guiding with an MX-716 and NP-101. Astrodon 6 nm FWHM H-a filter. Acquisition AA 3.0, processing in ImagesPlus, colorization with Noel Carboni’s Astronomy Tools actions.
Thank you for visiting my site.
Clear skies,
Dennis Persyk
Igloo Observatory Home Page http://dpersyk.home.att.net
Hampshire, IL
