omega reproccessed by rich

[skeltz (Rob)]

heres the same omega but reproccessed by my friend richard bowden ,just follow this link http://www.pbase.com/image/78042961

[Rob_K]

Great images! More colour and richer field in the 2nd processing, but I think I like the first better, with greater contrast. Why the flip?

Cheers -

[RB (Andrew)]

Very nice, but on my monitor it looks like the outer core has a slight cyan colour cast.

[richardo (Rich)]

Hey Rob,
good to see a comparison of the two images on Omega!
Thanks for the thanks....

As you know I wasn't overly happy with trying to processing this image, as we discussed, heavy gradient issues on all your subs.
Even dropping the green channel a fair way down with our ratio...
R :1, G :.94, B: 1.05 or there abouts...... knowing that this chip indeed is very sensitive in the green wave length,(bit like my SXH9) but found the balance getting lost and ending up with red core stars..... no way correct.
The gradient down half of the image stuffed any hope.
But thank goodness for IRIS's background extraction routine to at least get an even background.

Whether the gradient source is in your observatory...... but more likely, and in retrospect (not that I was there on the night.. how many Turkey's Rob???), the light dome of Streaky Bay... is what I'm thinking here Rob, your pretty much exposed to it.
You would have been pointing almost due south.... I think your exposures were in the 300sec sub area ??? any way this would have had the light show up pretty well, creeping into your dome opening.
I've found sometimes even the Milky Way from my Town hidden observatory giving me slight gradients with long exposures....
God damn those bright lights...... town she's a growin'.

So I guess for you with bright objects like this in the due south area, go the shorter sub exposures to keep the effects of the town light dome to a minimum. !! Just do test exposures and see what the trade off is on any object your going to image.
Your present main imaging setup has a monster FOV, with a fair bit of light gathering power... the nice sensitive Kodak chip and the lovely Taka will do the rest with lots of Lum frames for detail.

Any way Rob, congrats, you've made a great step towards getting your colour processing sorted. All trial and error with colour imaging and setup situations...
All great fun to share our trial and tribulations, plus our images,.. of course.
Now take it easy on the Wild Turkey's...
All the best for now
Rich

[Ric]

Very nice image, well done to you both.

Cheers

[jase (Jason)]

Originally Posted by richardo

Even dropping the green channel a fair way down with our ratio...
R :1, G :.94, B: 1.05 or there abouts...... knowing that this chip indeed is very sensitive in the green wave length,(bit like my SXH9) but found the balance getting lost and ending up with red core stars..... no way correct.
Rich

Rich / Rob,
I like both versions.
You may need to drop the green even further for this to work well, but you'll need to experiment with this. With the Custom Scientific LRGB filter set and the KAI-11000 chip, I usually start with 1.35:1.0:1.65 ratios (or if R is 1 then, 1.0:0.65:1.15). You'd need to verify the ratios against the Astronomik type II filters as they have different bandpasses and peak sensitivity lines. I found a good starting point for the KAI-11000 is 1.5:1.0:1.5 and working your way from there. I unfortunately have no images to show this balance as I'm presently scopeless. Will be sure to post as soon as I can though.

Keep up the good work.

[Garyh]

both processed images are real nice... Rich`s shows off the star colors very nicely..with a bit more contrast etc...but both top stuff
I like!!! and nice setup there rpsastronomy.....
cheers

[Dr Nick (Nick)]

Well done! However I have to agree with Rocket Boy about the cyan tinge...

[richardo (Rich)]

Originally Posted by jase

Rich / Rob,
I like both versions.
You may need to drop the green even further for this to work well, but you'll need to experiment with this. With the Custom Scientific LRGB filter set and the KAI-11000 chip, I usually start with 1.35:1.0:1.65 ratios (or if R is 1 then, 1.0:0.65:1.15). You'd need to verify the ratios against the Astronomik type II filters as they have different bandpasses and peak sensitivity lines. I found a good starting point for the KAI-11000 is 1.5:1.0:1.5 and working your way from there. I unfortunately have no images to show this balance as I'm presently scopeless. Will be sure to post as soon as I can though.

Keep up the good work.

Hey Jase,
interesting ratio's on your Custom Scientific filters... I'm sure Rob will have a bit more of a mess..
I actually did increase things in the R & B end to almost around those figures at one stage and dropped the green down to .8, was really weird colour to the core stars... very red as compared to what I get with my 10" reflector - Astronomiks and HX9.... at around R:1.1, G:.882, B 1.185...
Even my ED 80 was similar/ close to the above..
I think Rob will have to either get a g2V down or have some serious fun messing....
I found his Tarantula was far easier to process, weights at around R:1 G:.95 & B:1..... it showed good colour with no trace of green... although Rob did process and publish his version, so I have no idea of what he weighted things.
That's why I was thinking with this image of the Omega, the gradient affected things across the fOV.

Still that's for Rob to sort out.

Thanks for the interesting comparison between the Astronomiks and the Custom Scientifics.


All the best
Rich

p.s.
Sorry for hi jacking your thread here Rob....!!! ah.... over to you..

[skeltz (Rob)]

Yes well as we said ive just got to get my ratios right...anyway thanks for the comments1

Originally Posted by Rocket Boy

Very nice, but on my monitor it looks like the outer core has a slight cyan colour cast.

[skeltz (Rob)]

Yeah thanks rich as you said ..its all trial and error,but hey thats half the fun of it.
I dont think i had to many turkeys that night...or did i?? no i didnt...anyway as you know this colour thing is all new to me..cheers

Originally Posted by richardo

Hey Rob,
good to see a comparison of the two images on Omega!
Thanks for the thanks....

As you know I wasn't overly happy with trying to processing this image, as we discussed, heavy gradient issues on all your subs.
Even dropping the green channel a fair way down with our ratio...
R :1, G :.94, B: 1.05 or there abouts...... knowing that this chip indeed is very sensitive in the green wave length,(bit like my SXH9) but found the balance getting lost and ending up with red core stars..... no way correct.
The gradient down half of the image stuffed any hope.
But thank goodness for IRIS's background extraction routine to at least get an even background.

Whether the gradient source is in your observatory...... but more likely, and in retrospect (not that I was there on the night.. how many Turkey's Rob???), the light dome of Streaky Bay... is what I'm thinking here Rob, your pretty much exposed to it.
You would have been pointing almost due south.... I think your exposures were in the 300sec sub area ??? any way this would have had the light show up pretty well, creeping into your dome opening.
I've found sometimes even the Milky Way from my Town hidden observatory giving me slight gradients with long exposures....
God damn those bright lights...... town she's a growin'.

So I guess for you with bright objects like this in the due south area, go the shorter sub exposures to keep the effects of the town light dome to a minimum. !! Just do test exposures and see what the trade off is on any object your going to image.
Your present main imaging setup has a monster FOV, with a fair bit of light gathering power... the nice sensitive Kodak chip and the lovely Taka will do the rest with lots of Lum frames for detail.

Any way Rob, congrats, you've made a great step towards getting your colour processing sorted. All trial and error with colour imaging and setup situations...
All great fun to share our trial and tribulations, plus our images,.. of course.
Now take it easy on the Wild Turkey's...
All the best for now
Rich

[skeltz (Rob)]

many thanks for your comments RIC!!

Originally Posted by Ric

Very nice image, well done to you both.

Cheers

[skeltz (Rob)]

Thanks for your input JASE...yeah all this ratio stuff is a bit mind boggling for me but i will slowly get the grasp of it.
Just takes me a while to get the hang of things

Originally Posted by jase

Rich / Rob,
I like both versions.
You may need to drop the green even further for this to work well, but you'll need to experiment with this. With the Custom Scientific LRGB filter set and the KAI-11000 chip, I usually start with 1.35:1.0:1.65 ratios (or if R is 1 then, 1.0:0.65:1.15). You'd need to verify the ratios against the Astronomik type II filters as they have different bandpasses and peak sensitivity lines. I found a good starting point for the KAI-11000 is 1.5:1.0:1.5 and working your way from there. I unfortunately have no images to show this balance as I'm presently scopeless. Will be sure to post as soon as I can though.

Keep up the good work.

[skeltz (Rob)]

Nice to hear from you GARETH ..yeah i will get there in the end,and one day i will have to post some images of my setup1!

Originally Posted by Garyh

both processed images are real nice... Rich`s shows off the star colors very nicely..with a bit more contrast etc...but both top stuff
I like!!! and nice setup there rpsastronomy.....
cheers

[skeltz (Rob)]

thanks for the kind words nick

Originally Posted by Dr Nick

Well done! However I have to agree with Rocket Boy about the cyan tinge...

[skeltz (Rob)]

All right rich i will let you of this time at least this thread got some brain juices flowing for without everyones thoughts ,comments and critisism we would all stagnat .
At least this way most of us learn something..well i hope we do!!!!Anyway thanks to everyone for their comments ,all are appreciated

Originally Posted by richardo

Hey Jase,
interesting ratio's on your Custom Scientific filters... I'm sure Rob will have a bit more of a mess..
I actually did increase things in the R & B end to almost around those figures at one stage and dropped the green down to .8, was really weird colour to the core stars... very red as compared to what I get with my 10" reflector - Astronomiks and HX9.... at around R:1.1, G:.882, B 1.185...
Even my ED 80 was similar/ close to the above..
I think Rob will have to either get a g2V down or have some serious fun messing....
I found his Tarantula was far easier to process, weights at around R:1 G:.95 & B:1..... it showed good colour with no trace of green... although Rob did process and publish his version, so I have no idea of what he weighted things.
That's why I was thinking with this image of the Omega, the gradient affected things across the fOV.

Still that's for Rob to sort out.

Thanks for the interesting comparison between the Astronomiks and the Custom Scientifics.


All the best
Rich

p.s.
Sorry for hi jacking your thread here Rob....!!! ah.... over to you..

[skeltz (Rob)]

Thanks for your comments rob...always nice to hear from another rob
!!!

Originally Posted by Rob_K

Great images! More colour and richer field in the 2nd processing, but I think I like the first better, with greater contrast. Why the flip?

Cheers -