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Hi All, Anyone out there doing narrowband? I'm messing around with colors, but haven't really found a combination of Ha, SII, OIII I like yet. Thanks, Jim  |
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yep. i usually just do straight SHO and then fix the colors to look like the 'blue' hubble palette. but i guess that only works if there is enough SII and OIII in the target. rob |
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I'm starting to look at it. Juan Conejero via Rob Morse suggestion: · OIII = Blue Channel · Ha*0.2+OIII*0.8 = Green Channel · SII*0.8+Ha*0.2 = Red Channel (Juan Conejero calls this a more ‘natural’ representation; note healso says that if saturation is not an issue, then instead consider SII + 0.8*Ha for Red, 0.2*Ha + OIII for Green and pure OIII for Blue). Note I have seen others who use different mixes, such as mixing 50/50 SII and Ha to create the Red Channel, 85/15 OIII and Ha for Green, and 100% OIII for Blue. also have seen on PI forum..I need to find the post to remember who authored it..it was in response to someone named Brad: Forum poster's text: "... but you can just use PixelMath to do the percentage blends to get a better/proper Hubble mapping that isn't so heavily green weighted. I think its the following": R/K: 0.4*Ha + 0.6*SII G: 0.4*OIII + 0.3*Ha + 0.3*SII B: 1.0*OIII "This is another I saved off from this site a while ago, for a natural color blend": R/K: 0.76*Ha + 0.24*SII G: 1.0*OIII B: 0.85*OIII + 0.15*Ha jeff |
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If you use PI and want an interesting recipe, maybe try Rick Stevenson's ColorMask script: https://pixinsight.com/forum/index.php?topic=7751.0 |
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| Yes, I use PI. Thanks for the tips! I am going to try that ColorMask script. |
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what jerry pointed to is the only narrowband flow i ever use for SHO. other people talk about color balancing or mixing to get the hubble palette but to me rick's method is the most straightforward. rob |
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| I feel like Cocoon is just not a good narrowband target, it's more of an LRGB. You got all that broadband dust and reflection. |
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Thanks Jarrett, that sounds like part of the problem I'm having. Do you have a suggestions for a good narrowband target? Thanks Jim |
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I agree with Jarrett. I could not get good colors with Cocoon either (Astrodon 5nm filters). OSC images looked much better. You could use NB images to produce L frames so that you can reduce the stars in the background. Although, you may still want to use non-NB frames if you want to bring out the dust lanes. There are plenty of easy (bright) and good-looking NB targets. How about Veil Nebs, Heart & Soul, Elephant's Trunk? They are rich in colors (the three main NBs). I am shooting a bit more obscure and difficult (faint) large planetaries these days with NB. Seiji |
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Thank you for the suggestions. I am trying Veil tonight and the next few days. Jim |
