Using LRGB processing for OSC images and comparison without

[starwind]

I recently tried applying LRGB processing to my M51 data taken with my Canon t3i DSLR and was pleasantly surprised by the outcome:
https://www.astrobin.com/mkubki/D/?nc=user

High level process: split my Bayer drizzled integrated image into L,R,G,B components using PI's ChannelExtraction. Then processed by pretending to have acquired these channels separately: combining RGB channels and then adding in L using PI's LRGBCombination.

For comparison, the Bayer drizzled image processed the 'usual way' is here:
https://www.astrobin.com/cc6c6g/F/?nc=user

And the non Bayer drizzled (integrated with individual debayered subs) is here:
https://www.astrobin.com/cc6c6g/H/

The same subs were used in all three above. They've have had identical processing steps applied with mild differences to parameters within processes tuned to the differences in the starting points.

IMO, the noise is better controlled in the LRGB version and it has better colors, resolution and stars.

 

[jtaylor9]

I like the LRGB processed version better.  Nice job, thanks for the post.

JT

 

[ctaylor]

I recently tried applying LRGB processing to my M51 data taken with my Canon t3i DSLR and was pleasantly surprised by the outcome:
https://www.astrobin.com/mkubki/D/?nc=user

High level process: split my Bayer drizzled integrated image into L,R,G,B components using PI's ChannelExtraction. Then processed by pretending to have acquired these channels separately: combining RGB channels and then adding in L using PI's LRGBCombination.

For comparison, the Bayer drizzled image processed the 'usual way' is here:
https://www.astrobin.com/cc6c6g/F/?nc=user

And the non Bayer drizzled (integrated with individual debayered subs) is here:
https://www.astrobin.com/cc6c6g/H/

The same subs were used in all three above. They've have had identical processing steps applied with mild differences to parameters within processes tuned to the differences in the starting points.

IMO, the noise is better controlled in the LRGB version and it has better colors, resolution and stars.

Hi great job !

I'm in a similar predicament and new to PI.
Would you be able to provide the steps you took after ChannelExtraction ?

Cheers

 

[annehouw]

Hi Starwind,

Congratulatins with that image! Nicely done.
I have seen the remark of splitting OSC in L and RGB elsewhere and I tried it, but could not find very much of a difference. A lot of tools do this splitting "behind the curtains", with built-in recombination of channels. I just make use of this feature, like in MLT noise reduction, by choosing Chrominance (Restore CIE Y), followed by the same process, but now choosing Luminance (CIE Y) with milder settings. As far as I can tell, this makes splitting L and RGB not necessary. But I am not a veteran PI user, so am very interested in others' experiences with this.