Head of the JellyfishPosted By Jim Thommes |
Thanks for the comments guys..
Dan and Greg,
So for this image the color data comes the RGB exposures only. After luminance layering however, I did adjust the green and blue channels with a 18% subtraction of the HA (nebula only). I do this to restore the original RGB hue since the luminance layering tends the red toward pink or salmon.
Greg, I agree that blending the HA into red can take away the tonal subtleties - I didn't blend any HA into blue (interesting thought).
Dan, So in the processing, I did desaturate the head so the LRGB would work well on the nebula. But I am convinced that due to the short RGB subs, errors at the low intensity signal levels can (and did) creep in.
dan kowall said:
Well done, Jim.
A lot of people saturate the top of the 'head' of the Jellyfish, but you didn't.
I would have thought that 90 second subs for the RGB would be too short, but the color looks good on your image.
I especially like the subtle color shadings. Did that come just from the RGB data or did you blend some of the Ha data into the blue channel?
dan
Greg Bradley said:
Really lovely shot Jimmy. One of your best. You have a lovely colour balance on this object and it has a nice glow about it rather than the flat red that some Ha shots can give.
You can also add a bit of the Ha to the blue channel (about 15%).
That blue area looks good. I think a lot of nebulas have these O111 type blue areas that often get missed. The Lagoon for example has a lot of it surrounding it so does the Trifid.
Greg.
Dan and Greg,
So for this image the color data comes the RGB exposures only. After luminance layering however, I did adjust the green and blue channels with a 18% subtraction of the HA (nebula only). I do this to restore the original RGB hue since the luminance layering tends the red toward pink or salmon.
Greg, I agree that blending the HA into red can take away the tonal subtleties - I didn't blend any HA into blue (interesting thought).
Dan, So in the processing, I did desaturate the head so the LRGB would work well on the nebula. But I am convinced that due to the short RGB subs, errors at the low intensity signal levels can (and did) creep in.
