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BlockHead
About
- Username
- BlockHead
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Comments
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You are correct that when the redshift is great enough the Ha emission line would be shifted out of the bandpass for your "local reference" wavelength. It is for this reason that astronomers use filters that accommodate this shift (different bandpas…
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Well... the possible issue in this case is hardware. (Memory)The numbers are the same..and algorithms are the same and most important is that computers are deterministic machines. -the Blockhead
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Hmmm... I have no idea. I have not seen an unsolicited abort before. I can't even guess why this would happen- never seen anyone with this issue.It is curious the logfile ends *exactly* after debayering. -the Blockhead
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Just to be clear.. SPCC will not make colors "appear" or brighter. It will only make certain your data is calibrated and not having a bias in color because of the sensor/telescope itself. That is the point. You are right though, if you have not dete…
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Hi Matt, Can you provide some screenshots and describe the issue? Just so we are on the same page, you are using the data provided correct? I don't want to guess until there is a bit more information.Thanks,-the Blockhead
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I think there are many approaches for working with dual band images...and I am not expert in any.(I am not fan of this method of imagery... it is double filtering and seems problematic to me). I think there are transformations that attempt to extra…
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No... it doesn't quite answer my question.With your Optolong filters.. you are getting three NB images extracted from the OSC data right? So lets talk about the Ha emission. At some point you extract/create an Ha linear image right? If you do this f…
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Ok... so lets start with the wavelength. What is the difference between the two filters? (Pick only ONE wavelength). If these are basically the same wavelengths... then you can combine and let the weighting do its job. If the wavelengths are signif…
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I have the RTX 4090 on my machine.-the Blockhead
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I would certainly color calibrate my RGB data before adding anything to it... it would be weird to add Ha and then run SPCC. With the GAIA database as the reference... it would decrease the Ha contribution because SPCC would return values that try t…
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Hmm.. nothing per se.It is just that your worse data might be given more weight than better data because of the gain. This means that your stacked result will be noisier (or worse quality)- whereas it would have been better if the gain had been comp…
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Well.. if undesirable is the same as mathematically incorrect... then yes. If you do not compensate for the gains between images (subs or masters) then they will be given disproportionate weights when you stack them. This is a bit of an advanced top…
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Yes.The content on ABS is always the more full and complete content of what "leaks" out as YouTube videos.There are occasions when I make a YouTube video for "the world" (like I did for BXT, SPCC...etc). But then I just include the content at ABS. S…
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Actually noise evaluation is synonymous with PSF SNR. (review my weighting videos!)But yes, PSF SIgnal Weight is fine.-the Blockhead
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I think I may have done it in the old workflow video for NGC 2835.See the 11:30 minute of this video:https://www.adamblockstudios.com/articles/ngc-2835-part-3 -the Blockhead
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Yes, the past me was/is probably correct and I will need to edit that. But... the current me thinks that the normalized subframes (in any particular color) are no different than the final stacked version of the master frame. Yes, the weighting shoul…
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The weighting option probably isn't critical in this case. PSF Signal Weight or PSF SNR are probably both just fine. -the Blockhead
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It is fine to run this early on and in the case of color images before SPCC. However, there can be one issue (probably not for your 8" data) with undersampled images. The stars will become "brighter" in the sense that the PSFs are corrected. This ca…
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No rejection is correct (and no LN normalization).You definitely need to WEIGHT the images! At maximum the RGB channels are only taking in 1/3 of the light! There probably isn't a huge difference between doing the subs and using the masters. By int…
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Yes, this looks correct. Just make certain the name of your keyword that you label your folders (in this case B33) is not already in the file name. You can could call your folders Horsey_20231206 and Horsey_20231207 for example. Then you load the ke…