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BlockHead
About
- Username
- BlockHead
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Comments
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Hi Frederic, I am not certain I entirely agree (although I am accused of it often!). For example the NGC 6946 and NGC 6888 are both short data sets and the latter in particular is data from a gentleman that took the data from Detroit. The combinati…
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Alan, Well... one do the things I had *hoped* to have happen is for this group to start "self-helping" with knowledgeable members chiming in. That hasn't happened organically... *laugh* But it is worth a shot. My suggestion is to make the image avai…
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Hi Tony, NGC 6888 is part of the Horizon's collection of materials. Members of Horizons subscriptions (access) can see it. If you have reviewed all of my Fundamental material... and you *like* the content and style, you might also like Horizons. :) …
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Did you see this post? https://pixinsight.com/forum/index.php?topic=14307.0 -the Blockhead
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Alan, Arrows would be helpful! http://www.caelumobservatory.com/mlsc/temp.jpg Are you talking about the darkness (slight color difference) surrounding the embedded stars?This is due to the mismatch between luminance and color (other due to a blend …
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Hmmm... think an example image (from you) would be helpful here. Typically certain kinds of processing will create artifacts for stars embedded in nebulosity- and color is one of the things that can be affected especially at the star "edges" where i…
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Sounds promising. Thanks Ed.At the moment...I think I might have the flu... so I am a bit out of commission... but as soon as I feel better..I will get on it.
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Yeah...I will need to do this. I am not thrilled actually... since I am still not convinced in the overall S/N weighting scheme works as well as advertised. So I am a slow adopter. I think I need to do the SubFrameSelector section first... Unfortun…
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Yes, I see the effect in your image (bright star to the right side for example). I have not found a satisfactory solution really. There are some ways to lessen the appearance of the pattern by separating the channels and smoothing out the most offen…
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This is how HDRComposition works. It is performing that linear fit on your images and making masks to cover up the bits that are saturated in the longer exposures. So LF before HDRC wouldn't help anything as far as I know. Never hurts to experiment …
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Hi Giuseppe, You are absolutely right. Section 11 had an initial segment I did not include when I created the video!I fixed it and uploaded the new version of section 11. I think it will make more sense now.Thank you so much for catching this!-the B…
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Oh... section 07 did have an issue. I fixed it.Thank you for letting me know! -the Blockhead
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Hi Rex: Lesson:https://www.adamblockstudios.com/articles/ngc-6250-section-06 Appears OK and available as far as I can tell. I haven't uploaded the next section yet... but will soon.I will also make the data available soon too. Can you please verify…
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I assume you binarized your mask? Also, if stars have dark core... it means the star images in the mask are simply not large enough. There isn't anything special about 6 layers. You might need to go up a bit more. Again, without seeing any images...…
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HI Alan, These kinds of questions are tough to answer without seeing the data and masks. In short...I don't know. Likely it is a question of generating the right kind of mask. LHE is also a fairly aggressive operation- which raises the difficulty of…
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Hi Bob, I fear not. Usually it is not buffering though. Typically it is just the beginning and if you slide forward in time and then back... everything is OK. The issue is that the videos are maintained on Amazon Edge servers- and apparently if ther…
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DBE works on a per channel basis. So there should not be a difference between me creating a set of samples (with of all of the parameters initially set the same) and applying this to each grayscale (stacked) image compared with applying to the color…
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Local Normalization is fairly restrictive spatially... so the calculation and effects of its application occur on "small" scales with respect to the entire image. In another words... how LN is calculated and applied to something in the center of you…
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Hi Alan, It is probably more important to remove it from the luminance- since the donut is likely in the sky, which are dark pixel values. Any color that is dark will be hard to see... and if you neutralized your background color... this will furthe…
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Flats are particularly sensitive to both hardware (acquisition) and software troubles.You may have a perfect flat- but if the bias you subtract from it is not good...then the flat will not do its job. All kinds of things can happen. Flats need to c…