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BlockHead
About
- Username
- BlockHead
- Joined
- Visits
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- Last Active
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- Member, Administrator
Comments
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Yeah..that is a thing. PI is a platform that allows third party scripts or any kind. It is a difficult concept. -the Blockhead
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Weird! I see that too...
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IH Bruce, This might be too detailed for me to follow the logic without the data. A series of screenshots might help.However @JohnMurphy might also be able to "see" what is going on just from your description. -the Blockhead
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Since narrowband images tend to have fewer stars- you may want to use the manual PSF.Just find the FWHM of PSFs in your image (use Dynamic PSF to discover). I can tell just by looking though- you don't need to be super precise. Another thing to unde…
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I fear you might need to go the official forum for this question. I have not seen it- and it is not obvious to me what is wrong. I would suggest that you should (if you have not done this)- start the WBPP from scratch. Literally reset WBPP, set the …
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This certainly looks like a normal filter-caused halo to me (especially for NB when you are looking a small number of wavelengths- artifacts will indeed be more crisp). As for techniques... for this kind of halo- not so much. People usually get diff…
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Well... I think the way to think if it is to get the best sampling of the light to begin with and processing of any sort proceeds from there. But if you are *always* going to take data binned- use BXT and THEN upsample the image or a larger view- th…
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I am not certain.. but I do wonder about the path length.Did you adjust this on your machine (do you have the warning with diagnostics)? -the Blockhead
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David, The issue in the last frame shown here is not the same as what you started with. The last frame has walking noise because you did not dither your exposures. I would put money on it. :) Also, your point concerning not seeing the issue when *no…
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Hi Michael, Hmm...not quite? (It isn't what I tried to communicate in my videos.)Dark frames for flats are necessary for some cameras where there is an extra electronic signature or behavior that is in addition to a linear response (like dark curren…
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Roger, In general I leave the astrometry option of WBPP check as interactive. It can't fail and proceed by doing so.. you will have an opportunity to give it the information it needs. If you miss WBPP assigning it..that is OK. As you correctly said,…
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Excellent.-the Blockhead
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Yeah... replacing cables and moving them. If not cables.. you start to think about the sensor. you should check if it shows up in your master biases... (or darks) -the Blockhead
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Yes, that is a good observation and you are absolutely correct. People should look closely at the difference... more exposures usually means better S/N .. .not increased faint limits in a visual way. Faint stars (and nebula) will have better S/N... …
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I guess I need to remove the Old version.I just worked so hard on it! -the Blockhead
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I had forgotten to address this with you in our off-line conversation.... I am not certain what is the fix.-the Blockhead
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Hi Roger, Thanks for all of the commentary. -the Blockhead
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Nice job on all of thinking.Just a quick point- the issue of where emission lines fall in terms of a channel assignment is a tricky one. This is especially true for scientific filters (like Sloan) where the Ha line is actually in a "green" filter! -…
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Jeff, All WBPP is doing is reading the FITs header. Please examine the FITs header and see what is written there. (It should say BayerPat: RGGB or something like this)-the Blockhead
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Paul, There are a couple of issues. The point with NB filters is that you can obtain the proper ratio of flux (brightness) between them. If you put an NB filter in front RGB filters... this double filtering is kinda crazy. Since your H-alpha and SII…