CaK coloration issue using Infranview

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Jordan Konisky
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CaK coloration issue using Infranview

Post by Jordan Konisky »

Hello Everyone,
I am posting one of my images from a set of captures on my very first day of imaging in CaK using my SW ED100 (masked down to 50mm), Lunt CaK B1800 diagonal and ZWO1600. I first want to thank those many folks on SCF who helped me get this far. I look forward to quality improvements, but that is not the issue here which rather has to do with coloration using Infranview.
The first image was captured with SharpCap, stacked in AS3 and sharpened with Imppg. I next used Infranview for coloration which yielded the second image. You can clearly see that in addition to the disc, the background is purplish shaded.
My next goal was to make the background black by clicking on the purplish background and replacing it with black. This yielded image 3. I got the black background that I wanted, but as you can see in image 3, and as expected, any pixel of that original purplish background color was converted to black on my disc. Clearly not what I want.
I know that some of you are using Infranview. How do I color the disc while maintaining a black background?
ImageImage 1 by Jordan Konisky, on Flickr
ImageImage 2 by Jordan Konisky, on Flickr
ImageImage 3 by Jordan Konisky, on Flickr


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Re: CaK coloration issue using Infranview

Post by Merlin66 »

Jordan,
I find it comes down to selecting a background colour - try different points around the disk, and the tolerance selection. I usually use around 20 but I have been known to drop to 5-8 when similar problems occur.
Hope that helps.


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Re: CaK coloration issue using Infranview

Post by Montana »

Jordan,

I know nothing about Infraview but have you adjusted the histogram first? You need to bring the slider on the left hand side up towards the main histogram so the blacks aren't washed out. This will remove some of the glow and make the histogram more balanced. I'm not explaining myself well but I think your histogram is too squashed in a peak.

Alexandra


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Re: CaK coloration issue using Infranview

Post by Jordan Konisky »

Alexandra,

Thank you for you comment. Which histogram are you referring to? The one in Imppg? Or way back to the SharpCap capture histogram? Or something else?

Jordan


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Re: CaK coloration issue using Infranview

Post by Montana »

I don't use the one in ImPPG, I prefer to use Photoshop. In photoshop open Curves or Ctrl M

Make sure the histogram is spread from left to right, not all bunched in the middle.

Alexandra
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Re: CaK coloration issue using Infranview

Post by Jordan Konisky »

Alexandra,

So is the shape of the histogram that you sent me the goal that one shoots for?

J.


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Re: CaK coloration issue using Infranview

Post by marktownley »

Hi Jordan.

I convert the image to RGB and then use a hue value of 275 for CaK, that's all to colour it. Your method seems longer than necessary.

Is this a new CaK filter you have?

Mark


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Re: CaK coloration issue using Infranview

Post by Jordan Konisky »

Mark,

Yes, a new CaK filter. Why are you asking? I am not wedded to Infranview or anything else, but rather just searching for a method. What software are you using for your CaK image coloration? Can you give me with an example of your steps in that process?

Jordan


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Re: CaK coloration issue using Infranview

Post by marktownley »

Hi Jordan.

Reason I asked if it was new (and in this case is a good thing!) - look carefully at the disk image or the closeup - can you see there is like what looks like short lines running at angle 10 oclock to 4 oclock (as if on a clock face). This is astigmatism, it will be caused by the 2 blocking filters in the nosepiece of the CaK filter not lined up properly - i've seen this a number of times.

My advice would be to contact your vendor, send the black and white pictures and ask for a replacement sample.

Given that you are running the 100/900 at 50mm rules out the scope.

Sorry if this isn't what you were expecting to hear, but believe me the difference between a good sample of a CaK filter and a bad one (this one!) is night and day.

I use ImPPG for all my processing and then just add colour in photoshop for all my images.

Mark


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Re: CaK coloration issue using Infranview

Post by Jordan Konisky »

Mark,

Sent a photo to Lunt. Here is there response.

"Production has had a chance to take a look at your photo and have requested to see if you might be able to try something for us.
If you are perhaps able to take a photo, and then rotate your camera 90 degrees- and take another photo- our production team would be interested to see if this is camera orientation based potentially. We are able to see the lines you have noted and production would like to see if you are able to accommodate for the additional photos.
I hope to hear from you soon, thank you sir!"

Does this seem reasonable to you. I will, of course, send additional photos as soon as the weather clears.

Jordan


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Re: CaK coloration issue using Infranview

Post by marktownley »

That's a positive response from them. They smell the same thing as me.

Roll with their punches and send them the pictures. ;)


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Re: CaK coloration issue using Infranview

Post by Jordan Konisky »

Mark,

Much thanks for identifying this issue.

Jordan


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Re: CaK coloration issue using Infranview

Post by Jordan Konisky »

Mark et al
I have attached new images captured on July 3 through the Lunt CaK 1800 diagonal that was suspected to have misaligned filters leading to astigmatism. The new images were taken in two orientations of my ZWO 1600. As far as I can tell these images, when enlarged, do not show the pattern of wavy lines seen in the images that I previously posted. What has changed in the meantime? Only that I noticed significant smudges on the Lunt CaK diagonal nose face which I carefully removed. Were these smudges the likely culprit?

I would greatly appreciate it if you could examine these newer images and render your trained judgement as to whether the issue that you, Mark, noticed in my former images has been resolved. Would also appreciate a critique as to whether my imppg sharpening was overcooked or not.
I welcome comments and critique from all of you who have contributed to this post.
Jordan

Image15_31_07Z_l4 imppg by Jordan Konisky, on Flickr
Image15_23_49Z_l4 imppg by Jordan Konisky, on Flickr
Image15_21_55Z_l4 imppg by Jordan Konisky, on Flickr
Image15_20_09Z_l4 imppg by Jordan Konisky, on Flickr


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Re: CaK coloration issue using Infranview

Post by GreatAttractor »

Jordan Konisky wrote: Tue Jun 22, 2021 5:51 pm "Production has had a chance to take a look at your photo and have requested to see if you might be able to try something for us.
If you are perhaps able to take a photo, and then rotate your camera 90 degrees- and take another photo- our production team would be interested to see if this is camera orientation based potentially.
Interesting, this also helped in my case (I showed some pictures in this thread); I wonder what exactly is happening here. Sorry for an off-topic ;)


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Re: CaK coloration issue using Infranview

Post by Jordan Konisky »

Filip

I had a look at your related thread. Did you ever determine what was going on? No longer an issue?

Jordan


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Re: CaK coloration issue using Infranview

Post by marktownley »

Hi Jordan,

Look full size at the images, images 2 and 4 you can see the same issue running vertically, not as bad as previous but still there. The camera was rotated about 180 degrees and the lines remain the same orientation, that shouts filter to me.

You could try posting some stacked but unprocessed images, just in case this is a post processing artefact, but I don't think so.

Other thing to try; keeping the camera orientation fixed, rotate the CaK filter relative to scope and camera and see if the orientation changes, I think you will find it will. Rotate 45, 90, 135 and 180 degree increments, you will see the lines follow this pattern. That says it is the filter causing the issue.

If there were smudges on the elements (nose piece end?), my money is there is something on the internal face. Don't void the warranty by cracking the unit open send it back for replacement is my advice.

Mark


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Re: CaK coloration issue using Infranview

Post by GreatAttractor »

Jordan Konisky wrote: Tue Jul 06, 2021 1:10 am Did you ever determine what was going on? No longer an issue?
I didn't, if the image looks funny I just rotate the CaK module-camera-Barlow together in small increments until it's gone. But haven't seen it lately anyway.

EDIT I meant: rotate just the CaK module


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Re: CaK coloration issue using Infranview

Post by Jordan Konisky »

Mark et al
I have attached new images captured on July 3 through the Lunt CaK 1800 diagonal that was suspected to have misaligned filters leading to astigmatism. The new images were taken in two orientations of my ZWO 1600. As far as I can tell these images, when enlarged, do not show the pattern of wavy lines seen in the images that I previously posted. What has changed in the meantime? Only that I noticed significant smudges on the Lunt CaK diagonal nose face which I carefully removed. Were these smudges the likely culprit?

I would greatly appreciate it if you could examine these newer images and render your trained judgement as to whether the issue that you, Mark, noticed in my former images has been resolved. Would also appreciate a critique as to whether my imppg sharpening was overcooked or not.
I welcome comments and critique from all of you who have contributed to this post.
Jordan

Image15_31_07Z_l4 imppg by Jordan Konisky, on Flickr
Image15_23_49Z_l4 imppg by Jordan Konisky, on Flickr
Image15_21_55Z_l4 imppg by Jordan Konisky, on Flickr
Image15_20_09Z_l4 imppg by Jordan Konisky, on Flickr


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Re: CaK coloration issue using Infranview

Post by Jordan Konisky »

Mark,
Of the four images that I posted earlier; I could see some evidence of lines only on image 2. The first image below is a reprocessing of that image, which a least to my 80yr old eyes, lacks such lines.
Images 2-5 are the stacked images of the four previous posted images with no processing. Again, to my eye, I do not see lines.
Would greatly appreciate your assessable of these images.
Jordan
https://flic.kr/p/2m9BtEV
https://flic.kr/p/2m9Bzbz
https://flic.kr/p/2m9BwKc
https://flic.kr/p/2m9GgMH
https://flic.kr/p/2m9K2Hf


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Re: CaK coloration issue using Infranview

Post by Jordan Konisky »

Mark,

Now with the correct image codes.

Of the four images that I posted earlier; I could see some evidence of lines only on image 2. The first image below is a reprocessing of that image, which a least to my 80yr old eyes, lacks such lines.
Images 2-5 are the stacked images of the four previous posted images with no processing. Again, to my eye, I do not see lines.
Would greatly appreciate your assessable of these images.
Jordan
Image15_23_49Z_l4_ap4160imppg2.2 2x by Jordan Konisky, on Flickr

Image15_23_49Z_l4_ap4452_limit000001-000125 by Jordan Konisky, on Flickr

Image15_31_07Z_l4_ap2876 by Jordan Konisky, on Flickr

Image15_21_55Z_l4_ap3853_limit000001-000125 by Jordan Konisky, on Flickr

Image15_20_09Z_l4_ap4126 by Jordan Konisky, on Flickr


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Re: CaK coloration issue using Infranview

Post by Jordan Konisky »

Mark,

BTW, thank you so much for explaining how you do your coloring in PS. It worked beautifully for me.

Jordan


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