RGB only

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gardenfish
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RGB only

Post by gardenfish » Wed Nov 02, 2016 2:12 pm

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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Re: RGB only

Post by Doug » Wed Nov 02, 2016 9:45 pm

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
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Re: RGB only

Post by gardenfish » Thu Nov 03, 2016 10:58 am

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.
ES127CF FCD100
CEM60EC on PierTech 2 in Roll-off observatory

Takahashi TOA150
CEM60 out side pier

SV70T

QSI6120WSG-8
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3nm Ha-OIII-SII

ST80 - AT60MM Guide scopes
G3 mono - ASI290MM Mini Guide camera's

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Doug
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Re: RGB only

Post by Doug » Thu Nov 03, 2016 11:23 am

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
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Re: RGB only

Post by gardenfish » Thu Nov 03, 2016 12:46 pm

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.
ES127CF FCD100
CEM60EC on PierTech 2 in Roll-off observatory

Takahashi TOA150
CEM60 out side pier

SV70T

QSI6120WSG-8
Astrodon LRGB
3nm Ha-OIII-SII

ST80 - AT60MM Guide scopes
G3 mono - ASI290MM Mini Guide camera's

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Doug
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Re: RGB only

Post by Doug » Thu Nov 03, 2016 8:18 pm

Makes sense.
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gardenfish
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Re: RGB only

Post by gardenfish » Fri Nov 04, 2016 6:03 am

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 ?
ES127CF FCD100
CEM60EC on PierTech 2 in Roll-off observatory

Takahashi TOA150
CEM60 out side pier

SV70T

QSI6120WSG-8
Astrodon LRGB
3nm Ha-OIII-SII

ST80 - AT60MM Guide scopes
G3 mono - ASI290MM Mini Guide camera's

Nikon D5200 Full Mod

User avatar
Doug
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Re: RGB only

Post by Doug » Sat Nov 05, 2016 8:31 am

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.
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