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ASI 183MC colours?

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21 replies to this topic

#1 Ittaku

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Posted 22 April 2021 - 05:16 PM

I'm experimenting between the colour and monochrome versions of the same sensor, but I can't find any decent reference online for what the Wred and Wblue settings should be for the MC. Firecapture defaulted to 52 and 95 but these seemed wrong in the presence of an UV+IR filter presumably reducing the amount of visible red and blue. Anyone have a good reference for what they should be?


Edited by Ittaku, 22 April 2021 - 06:41 PM.

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#2 Borodog

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Posted 22 April 2021 - 06:39 PM

I'll let you know after tonight's session. I have a UV/IR cut filter in and the plan is hit the auto white balances on the Moon. That should get me in the ball park.

 

PS. I don't think an IR filter alone will cut it, pun intended. I believe you will need UV cut as well to get a natural color balance out of the 183MC.


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#3 Ittaku

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Posted 22 April 2021 - 06:41 PM

I'll let you know after tonight's session. I have a UV/IR cut filter in and the plan is hit the auto white balances on the Moon. That should get me in the ball park.

 

PS. I don't think an IR filter alone will cut it, pun intended. I believe you will need UV cut as well to get a natural color balance out of the 183MC.

Thanks, I should clarify - I'm using a Baader UV/IR cut filter.



#4 Tulloch

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Posted 22 April 2021 - 06:45 PM

Hi Con, I don't think you are going to find what you are looking for online, at least to the accuracy you might want. As you know, I have little bit of experience with this lol.gif, my advice would be to either start imaging some colour charts (like these), or compare your results to a "known" system and adjust your Wred and Wblue values to match. I tried this for an image of Jupiter that Darryl took with the new ASI462MC and came up with the values 69 & 86, but I've never got a chance to test these values for myself.

https://www.cloudyni...etc/?p=10376048

 

Others who also have the ASI462MC who have tried these values report that they are happy with the result, but there may still be a little adjustments to make.

 

Andrew


Edited by Tulloch, 22 April 2021 - 06:46 PM.

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#5 maxsid

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Posted 22 April 2021 - 06:47 PM

wr and wb should be 50-50



#6 Ittaku

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Posted 22 April 2021 - 06:47 PM

Hi Con, I don't think you are going to find what you are looking for online, at least to the accuracy you might want. As you know, I have little bit of experience with this lol.gif, my advice would be to either start imaging some colour charts (like these), or compare your results to a "known" system and adjust your Wred and Wblue values to match. I tried this for an image of Jupiter that Darryl took with the new ASI462MC and came up with the values 69 & 86, but I've never got a chance to test these values for myself.

https://www.cloudyni...etc/?p=10376048

 

Others who also have the ASI462MC who have tried these values report that they are happy with the result, but there may still be a little adjustments to make.

 

Andrew

Thanks Andrew, that's great, but the camera I'm asking about lol.gif



#7 Tulloch

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Posted 22 April 2021 - 08:48 PM

Thanks Andrew, that's great, but the camera I'm asking about lol.gif

Yes, but my point was if you have a camera you know the "correct" settings for, you can adjust your Wred and Wblue to make the 183 look like them.


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#8 Ittaku

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Posted 22 April 2021 - 08:58 PM

Yes, but my point was if you have a camera you know the "correct" settings for, you can adjust your Wred and Wblue to make the 183 look like them.

Ah my bad. I don't have that 462 camera any more.



#9 Borodog

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Posted 22 April 2021 - 10:37 PM

Ittaku,

 

I got 64 and 99 tonight. I'll let you know if I would adjust that once I've post-processed the data.


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#10 Ittaku

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Posted 22 April 2021 - 10:38 PM

I got 64 and 99 tonight. I'll let you know if I would adjust that once I've post-processed the data.

Thanks very much. A rough estimate on Jupiter I was at 70 and 99.


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#11 Borodog

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Posted 22 April 2021 - 11:01 PM

Seems like we are in the ball park.


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#12 Borodog

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Posted 23 April 2021 - 10:33 AM

Ok. Looking at the post-processing, the raw histogram looks a little bit out of whack. The blue channel looks like it should be somewhere around 105-106, and the red channel looks like it could be reduced maybe 1 tick to 63.

 

 

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#13 Ittaku

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Posted 23 April 2021 - 04:39 PM

Ok. Looking at the post-processing, the raw histogram looks a little bit out of whack. The blue channel looks like it should be somewhere around 105-106, and the red channel looks like it could be reduced maybe 1 tick to 63.

Thanks, it's sounding very similar to the 224 colours then.


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#14 Ittaku

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Posted 27 April 2021 - 10:49 PM

Weirdly, I tried mine with those values this morning and found them quite a way off when balancing colours afterwards. It seems mine is more about Red 70, Blue 95. I wonder if it's the different UV/IR filters or slightly different cameras, or both?



#15 Borodog

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Posted 27 April 2021 - 10:54 PM

It may well be. Also I realized the camera won't go as high as 105. So every image I shoot of the Moon has to be color corrected for the blue channel.


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#16 Ittaku

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Posted 27 April 2021 - 10:56 PM

It may well be. Also I realized the camera won't go as high as 105. So every image I shoot of the Moon has to be color corrected for the blue channel.

That's what Andrew keeps complaining about with his 224, that he always needs 10% more blue than the maximum possible.
 


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#17 Ittaku

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Posted 29 April 2021 - 01:13 AM

Did some more imaging and measurements here. My conclusion is that with my Baader UV/IR cut filter, I need Wred at 72, and Wblue at 101 (which is of course impossible so 99 it is.)


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#18 matt_astro_tx

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Posted 30 April 2021 - 04:32 AM

I have the same camera. My colors were completely wrong until, through another forum I was advised to 

1. set wr and wb to 50

2. Get a uv/ir cut filter

 

Now everything is looking great. 
 

Here is that thread. https://www.cloudyni...asi-mc-cameras/


Edited by matt_astro_tx, 30 April 2021 - 04:34 AM.


#19 Ittaku

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Posted 30 April 2021 - 04:55 AM

I have the same camera. My colors were completely wrong until, through another forum I was advised to
1. set wr and wb to 50
2. Get a uv/ir cut filter

Now everything is looking great.

Here is that thread. https://www.cloudyni...asi-mc-cameras/

You'll see I have a UV/IR filter already if you read my posts. Colours are now perfect without needing to do any colour adjustment at processing time, but thanks anyway.
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#20 matt_astro_tx

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Posted 30 April 2021 - 06:38 AM

You'll see I have a UV/IR filter already if you read my posts. Colours are now perfect without needing to do any colour adjustment at processing time, but thanks anyway.

Good deal my friend.  Glad it's working.



#21 Borodog

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Posted 01 May 2021 - 08:41 PM

My red and green channel look great but I definitely need 5% more blue that I can get. Oh well. Easy enough to fix in post.


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#22 Ittaku

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Posted 01 May 2021 - 08:48 PM

My red and green channel look great but I definitely need 5% more blue that I can get. Oh well. Easy enough to fix in post.

I only calculated I needed 2% more for mine yet I don't bother since it's so close. My last two Jupiter and Saturn pics were done with just the cam's colour settings and look spot on to me.


Edited by Ittaku, 01 May 2021 - 08:56 PM.

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