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RGB only

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gardenfish

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Post Wed Nov 02, 2016 2:12 pm

RGB only

In PS to combine lrgb you make a new copy pic from the lum to add the rgb channels. If you are doing just rgb do you get the new copy channels by making a new copy pic from the red?
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Doug

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Post Wed Nov 02, 2016 9:45 pm

Re: RGB only

I always align lrgb before I start PS, then make a rgb combined image, process that to its best color, and even over saturate it. Then make another image with the L channel, spend a good amount of the making the mono L look its best, then copy and paste on the rgb as a luminance layer over the rgb image.
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gardenfish

Hypergalaxy

Posts: 1117

Joined: Fri Feb 05, 2016 9:18 am

Location: Phoenix Az.

Post Thu Nov 03, 2016 10:58 am

Re: RGB only

I understand all that I think. My question is where to get the rgb channels from when there is no luminance sub. Normally you would copy the luminance sub to get the rgb channels. I ended up copying the red sub to get the rgb channels.
Takahashi TSA120
Takahashi TOA150
SV70T
CEM60 - PierTech2 pier
QSI6120 WSG-8
Astrodon 31mm LRGB E Series -Ha-3nm - OIII-3nm - SII-3nm

G3 Mono - ASI290MM Mini - ST80

ES 152 AR - Atlas mount
16" goto Dob

Nikon D5200 Modded

Roll-off roof Observatory
<<

Doug

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The good thing about science is that it’s true whether or not you believe in it. ― Neil deGrasse Tyson

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Joined: Tue Dec 23, 2008 11:41 am

Location: Temecula, California

Post Thu Nov 03, 2016 11:23 am

Re: RGB only

Rick, what camera are you using? Is it mono? If it's a mono camera, then you should have LRGB frames. If it's One Shot Color (OSC)...that's a different story.
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gardenfish

Hypergalaxy

Posts: 1117

Joined: Fri Feb 05, 2016 9:18 am

Location: Phoenix Az.

Post Thu Nov 03, 2016 12:46 pm

Re: RGB only

Its the ATIK. In the book of 100 best astrophotography targets.....by Ruben Kier... It is said on some clusters that luminance is not needed as it has no benefits for the pic. Only rgb is needed. So I was trying it out.
Takahashi TSA120
Takahashi TOA150
SV70T
CEM60 - PierTech2 pier
QSI6120 WSG-8
Astrodon 31mm LRGB E Series -Ha-3nm - OIII-3nm - SII-3nm

G3 Mono - ASI290MM Mini - ST80

ES 152 AR - Atlas mount
16" goto Dob

Nikon D5200 Modded

Roll-off roof Observatory
<<

Doug

User avatar

The good thing about science is that it’s true whether or not you believe in it. ― Neil deGrasse Tyson

Posts: 6416

Joined: Tue Dec 23, 2008 11:41 am

Location: Temecula, California

Post Thu Nov 03, 2016 8:18 pm

Re: RGB only

Makes sense.
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More Images.
:darkgrin:
CPC800, 60MM Classic Refractor, EON72, EON120, Atlas EQ-G, SSPro V1, SSAG, IDAS LPS Filter, TRF-2008
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gardenfish

Hypergalaxy

Posts: 1117

Joined: Fri Feb 05, 2016 9:18 am

Location: Phoenix Az.

Post Fri Nov 04, 2016 6:03 am

Re: RGB only

So then using the red sub to get the rgb channels is correct or is there another way in PS to do a fake luminance channel to aquire the correct rgb channels for combining ?
Takahashi TSA120
Takahashi TOA150
SV70T
CEM60 - PierTech2 pier
QSI6120 WSG-8
Astrodon 31mm LRGB E Series -Ha-3nm - OIII-3nm - SII-3nm

G3 Mono - ASI290MM Mini - ST80

ES 152 AR - Atlas mount
16" goto Dob

Nikon D5200 Modded

Roll-off roof Observatory
<<

Doug

User avatar

The good thing about science is that it’s true whether or not you believe in it. ― Neil deGrasse Tyson

Posts: 6416

Joined: Tue Dec 23, 2008 11:41 am

Location: Temecula, California

Post Sat Nov 05, 2016 8:31 am

Re: RGB only

Not really certain...L on stars really isn't going to add much. If you take another layer and make it L, it seems it always make the RGB lighter. Now that we've had this discussion, the L channel is responsible for bring out the detail in most Nebula shots, but, for stars, you really don't need it....?!?!?!

I think the best suggestion is the next time you grab a globular, spend another few minutes, and grab the L too. Then you can see for yourself what the L channel adds/subtracts from a globular image.
Image
MyAstroImages.com Photo Album. Sharing Your AstroImages On Line!
More Images.
:darkgrin:
CPC800, 60MM Classic Refractor, EON72, EON120, Atlas EQ-G, SSPro V1, SSAG, IDAS LPS Filter, TRF-2008

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