Ic434 - Colour Added

[rwong]

Hi Martin

Absolutely stunning image. I'd love to purchase an A3 print to have it framed.

Cheers
Reg

[Martin Pugh]

Thanks Greg

no, the Ha plus Lum approach to create a master luminance is my own doing, and the aim is to accentuate the extended data, and the additional detail revealed by Ha, and to significantly reduce stellar profiles. When you add deconvolution on top, the stars look great.

The correct approach will prevent clipping the stars.

cheers
Martin

[gregbradley]

Hi Martin,

Not only an accomplished imager but also an innovator!!

Interesting data. Yes I can see that Ha and lum added together could bring out the best of both worlds - small stars and increased detail.

Do you run deconvolution on all the RGB masters as well or do you run a separate luminance with deconvolution?

Also when doing deconvolution do you use positive constraint or entropy?

Also when selecting a star to start deconvolution do you just click on any star that seems to be typical of the image or do you select on some other basis - like one that is a bit tighter than the others or one that is less tight than the others?

Also when doing your colour work did you add another layer for Ha or were you satisfied with the Ha/lum blend used as a combined luminance?

Sorry for all the questions but you are at the cutting edge here and your results speak for themselves.

Greg.

[Martin Pugh]

Hi Greg.....not quite an innovator, just someone who experiements often and wildly!

Do you run deconvolution on all the RGB masters as well or do you run a separate luminance with deconvolution?
Occasionally I might deconvolve one of the RGB frames if stars are more bloated than others, or I might run the Minimum filter or other techniques I have in my arsenal to make those stellar widths equal. However, I always deconvolve my luminance frame.

Also when doing deconvolution do you use positive constraint or entropy?
PC

Also when selecting a star to start deconvolution do you just click on any star that seems to be typical of the image or do you select on some other basis - like one that is a bit tighter than the others or one that is less tight than the others?
I find that star selection is quite important, and combined with whether you deconvolve or ddp first. Noting that deconvolution can take a while in CCDS, my procedure right now with the Vista 64bit box I have, is to run two separate routines, on a selection for additional speed, choosing different stars, and comparing the results. However, as a general guide, I select a star that is well separated, near saturation, having a lowish FWHM value.

Also when doing your colour work did you add another layer for Ha or were you satisfied with the Ha/lum blend used as a combined luminance?

For IC434, the Ha/Lum blend was all I needed......I did not then blend Ha with Red, although, that could have proved to be an interesting outcome, but I was pleased enough with the result to begin with. I might go back and see what that additional 'traditional' approach might do to the image.

Sorry for all the questions but you are at the cutting edge here and your results speak for themselves

no problem.

cheers and HTH
Martin

[rwong]

Hi Martin

Just let you know I have received the printed version of IC434 Horsehead and IC2948 Running Chicken.
They arrived in mint conditions and the colour are superb. Fantastic print work at reasonable price. Also thanks for the 20 postcards thar come with the prints and printed descriptions of the objects.

I will definitely have them framed.

Cheers
Reg