an additional comment RE: pseudo RGB version RE: [ap-ug] 93 hours Widefield Bubble/SH2-155 region in L + S2HaO3


Nov 15, 2017

 


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#75808 Nov 15, 2017

You can also exploit this method using the two filters to allow you to make a Pseudo-RGB image along the way to making a tricolor using the wavelength (Hubble) palette







You sort of get a two-fer in a way







Examples:







www.narrowbandimaging.com/images/ngc7000_p300ed_pl39km_fli_rsrch_hao3_49x15min_7mp.jpg







www.narrowbandimaging.com/images/ngc7000_p300ed_f4_pl39km_fli_rsrch_s2hao3_107x15min_7mp.jpg







www.narrowbandimaging.com/images/ic410_mk1sn2_dm_ao_cshao3_8x45min_preview.jpg







www.narrowbandimaging.com/images/ic410_mk1sn2_dm_ao7_CsS2HaO3_13x45min_preview.jpg







www.narrowbandimaging.com/incoming/m16_ap155_ml0694_HaO3_14x15min.jpg







www.narrowbandimaging.com/incoming/m16_ML0694_ap155_s2hao3_11x15mS2_14x15mHa_56x15mO3_ps.jpg











From: ap-ug@yahoogroups.com [mailto:ap-ug@yahoogroups.com]

Sent: Wednesday, November 15, 2017 6:41 PM

To: ap-ug@yahoogroups.com

Subject: Re: pseudo RGB version RE: [ap-ug] 93 hours Widefield Bubble/SH2-155 region in L + S2HaO3











Thanks for this clarification, Richard.







But, if I need to then to take longer exposures on the TWO filters, it doesn.t save me any time, especially on difficult to find, clear nights. It almost seems that an image can be successfully .emulated., requiring more time and work to overcome the loss of the third filter, but is not quite as good as the .traditional. real thing - RGBL.







It is interesting, as an academic experiment, that a 2-filter image can be processed to look quite similar, but perhaps there is too much loss in quality to be practical.







Appreciate the info, and I will give it try, just out of curiosity. When I get a chance, I.ll read through your paper on this . hopefully you have a side-by-side example of the two methods results, with & without the third filter, without extending the exposures on the 2-filter shot, just to compare things equally.







Joe











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