Dual Band eXtractThe script allows you to extract the SII, HA and OIII signal from dual band filters to compose a SHO image  Download script:https://dbxtract.astrocitas.com/Youtube video (spanish version): https://youtu.be/hREbb3tIztw?si=4iwh79why6RylUu3In color cameras, it's increasingly popular to use dual-band filters like the well-known Optolong L-Ultimate and Askar ColorMagic. However, extracting the specific signal from each emission band can be challenging. This script enables the extraction of the emission bands of Ha, SII, and OIII, taking into account the contributions of each band in the RGB channels. This is done by considering the quantum efficiency (QE) parameters of different Sony sensors (IMX). Inspired in Dark Sky Geek youtube channel (thanks)For example, the following graph represents the QE of the IMX 571 sensor. By drawing a line for each of the emission bands captured by the most common dual-band filters, we obtain that each RGB channel is represented by a percentage of transmission. Therefore, it is not correct to assign the Ha or SII signal natively to the R channel, nor the OIII to the G or B channels. From these formulas, it's possible to isolate each of the Ha, SII, and OIII signals as part of an RGB combination. For example, HA = (R - 0,03*O3) / 0,80 or S2 = (R - 0,03*O3) / 0,73 to IMX 533 sensor.  Finally, the OIII signal should be calculated after isolating Ha and SII in their respective B and R channels using this formulas:  An example of Askar ColorMagic C1 and C2, ZWO ASI 533mc-pro of NGC 7635NGC 7635, Bubble Nebula by Fran MasipFigure 1. HO and SO images  Figure 2. SII, OIII and Ha extracted signal  Figure 3. SHO combination  Figure 4. Final image  Download script:https://dbxtract.astrocitas.com/Youtube video (spanish version): https://youtu.be/hREbb3tIztw?si=4iwh79why6RylUu3 |
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is it meant to be used linearly only?
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is it meant to be used linearly only? No, you can use it both linearly and non-linearly. In addition, even in stars directly and then compose the color of these from SHO
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Report that we have discovered a problem in OIII composition in some sensors. We are working on solving it
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[pre]Hi Raúl, in which sensors?
Congrats for this usefull script.[/pre]
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Carmelo Garcia de Rich:
Hi Raúl, in which sensors?
Congrats for this usefull script. Thanks a lot Carmelo. All sensors except IMX 571. The problem appears on some objects where the green channel is not very high and is overridden by the red. Dark Sky Geek was targeting the same problem and got a manual fix. I try to generalize it
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Hi Raúl, I got this error message when I try to install your script. Do you know if there is something wrong with the script or if the issue is on my side? Ben  |
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I see one problem, but this problem is inevitable using an OSC.
Any time you add or substract the splitted RGB channels to get the narrowband compositions, you are mixing the bands, because one channel didn't have only one band. May be a despreciable amount, but testing with bright objects as M27, and comparing a real OIII image with a syntetic one (generated doing the inverse of the Youtube formulas and then the script) you can see some differences.
But like I said at the beginning, this is inevitable using an OSC with multi band filters (with single band filters you simply extract luminance).
This aproach (the script) gives better results than using only single extracted channels.
Greetings.
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Ben Altmann-Vacqué:
Hi Raúl,
I got this error message when I try to install your script.
Do you know if there is something wrong with the script or if the issue is on my side?
Ben
Hi Ben. You must have an updated version of Pixinisght to have my signature as a developer. Pixinsight includes valid developers in updates and im too new
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Enol Matilla:
I see one problem, but this problem is inevitable using an OSC.
Any time you add or substract the splitted RGB channels to get the narrowband compositions, you are mixing the bands, because one channel didn't have only one band. May be a despreciable amount, but testing with bright objects as M27, and comparing a real OIII image with a syntetic one (generated doing the inverse of the Youtube formulas and then the script) you can see some differences.
But like I said at the beginning, this is inevitable using an OSC with multi band filters (with single band filters you simply extract luminance).
This aproach (the script) gives better results than using only single extracted channels.
Greetings. Thanks a lot Enol. It is true and in some objects the difference is more evident. But it is a better approach than assigning channels directly. I'm still working on improving the initial approach and comparing with mono
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Raúl Hussein:
Ben Altmann-Vacqué:
Hi Raúl,
I got this error message when I try to install your script.
Do you know if there is something wrong with the script or if the issue is on my side?
Ben
Hi Ben. You must have an updated version of Pixinisght to have my signature as a developer. Pixinsight includes valid developers in updates and im too new OMG... I´m ashamed. Now it worked perfect. Thank you Raúl :-)
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This is a much needed solution! Thank you very much for your time and effort producing this. I am certain it will continue to improve as you say! I have tried very basic single channel extraction which has not worked very well at all as you have explained so I have been limiting my usage of dual band filters. But now that you have provided this resource I can revisit this!
Thanks again!
Best regards,
Dave
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Thanks a lot very nice script! I did in the the pixelmath but this is very quick and easy.
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Wow, this is great.
Would this work with a tri or quadband filter? I have a Radian Ultra quadband that gets very little use these days.
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Hi,
Really nice tool! Does this also work with just a HOO with a dual band filter (no Sii-Oiii filter)?
Daniele
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Gran trabajo como siempre Raúl.
Ya lo estuve probando y es evidente la mejora.
Un abrazo
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Raúl Hussein:
Dual Band eXtract
The script allows you to extract the SII, HA and OIII signal from dual band filters to compose a SHO image
Download script:https://dbxtract.astrocitas.com/
Youtube video (spanish version): https://youtu.be/hREbb3tIztw?si=4iwh79why6RylUu3
In color cameras, it's increasingly popular to use dual-band filters like the well-known Optolong L-Ultimate and Askar ColorMagic. However, extracting the specific signal from each emission band can be challenging.
This script enables the extraction of the emission bands of Ha, SII, and OIII, taking into account the contributions of each band in the RGB channels. This is done by considering the quantum efficiency (QE) parameters of different Sony sensors (IMX). Inspired in Dark Sky Geek youtube channel (thanks)
For example, the following graph represents the QE of the IMX 571 sensor. By drawing a line for each of the emission bands captured by the most common dual-band filters, we obtain that each RGB channel is represented by a percentage of transmission. Therefore, it is not correct to assign the Ha or SII signal natively to the R channel, nor the OIII to the G or B channels.
From these formulas, it's possible to isolate each of the Ha, SII, and OIII signals as part of an RGB combination. For example, HA = (R - 0,03*O3) / 0,80 or S2 = (R - 0,03*O3) / 0,73 to IMX 533 sensor.
Finally, the OIII signal should be calculated after isolating Ha and SII in their respective B and R channels using this formulas:
An example of Askar ColorMagic C1 and C2, ZWO ASI 533mc-pro of NGC 7635NGC 7635, Bubble Nebula by Fran Masip
Figure 1. HO and SO images
Figure 2. SII, OIII and Ha extracted signal
Figure 3. SHO combination
Figure 4. Final image
Download script:https://dbxtract.astrocitas.com/
Youtube video (spanish version): https://youtu.be/hREbb3tIztw?si=4iwh79why6RylUu3 A great script, it makes our work much easier and with spectacular results
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Dave & Telescope:
This is a much needed solution! Thank you very much for your time and effort producing this. I am certain it will continue to improve as you say! I have tried very basic single channel extraction which has not worked very well at all as you have explained so I have been limiting my usage of dual band filters. But now that you have provided this resource I can revisit this!
Thanks again!
Best regards,
Dave Thanks Dave, im glad you found it useful
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Alejandro Navarro:
Gran trabajo como siempre Raúl.
Ya lo estuve probando y es evidente la mejora.
Un abrazo Wow, this is great.
Would this work with a tri or quadband filter? I have a Radian Ultra quadband that gets very little use these days. No, sorry. It is only designed for dualband but nothing stops you from trying it. In such wide band filters it is difficult to discriminate the emission bands in any case.
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Daniele Borsari:
Hi,
Really nice tool! Does this also work with just a HOO with a dual band filter (no Sii-Oiii filter)?
Daniele Thanks Daniele! Yes, you can use it with Ha+OII filters only to compose a HOO palette. The script will create said palette with a synthetic green (30% Ha and 70% OIII), but you can later compose the palette as you consider best.
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Great work Raúl! Three parameters and three equations, linear algebra at its best  Would you consider adding an option to manually enter the coefficients? In that way, I think people can find their best coefficients from the ones that automatically comes with the sensor info.
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Hi Raúl, I generate a different error attempting two download the script. While PI recognizes the URL and you as developer, when it attempts to download I generate the following error:  |
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Kay Ogetay:
Great work Raúl! Three parameters and three equations, linear algebra at its best  Would you consider adding an option to manually enter the coefficients? In that way, I think people can find their best coefficients from the ones that automatically comes with the sensor info. Hahaha that's right. Yes, it is an option that has been previously requested of me. You will have it in future versions. Thanks Kay
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Tom Boyd:
Hi Raúl,
I generate a different error attempting two download the script. While PI recognizes the URL and you as developer, when it attempts to download I generate the following error:
Are you using MAC? A friend had the same problem and the solution was to check the URL. Needs a / at the end https://dbxtract.astrocitas.com/ |
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