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BlockHead
About
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- BlockHead
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Comments
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Ok... now we are getting somewhere.I can't speak to the degree of contrast/sharpness/saturation that you find pleasing. For me, this image looks pretty close to complete and self-consistent. I perhaps would have tried (if you did not do it) the colo…
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Hmmm... I think the approach is to put the question into the language of image processing. "Pull Out" is sufficiently ambiguous and you will not find a "pull out" process in PI. So your choices are make brighter, make darker, increase contrast (both…
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In the linear state you can add images together using PixelMath and maintain the true signal strengths and relationships between the data. If you permanently stretch the data...all of that information is lost. This isn't about NB vs broadband- it is…
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You know...I was about to answer...but I think I should let @JohnMurphy really speak to this. My gut says you will not want to mix-and-match the normalization and weighting aspects of what will be image integration. I think you are going to have to …
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There are an infinite number of workspaces... 4 is just the initial number. You can add more. :)-the Blockhead
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Hmm... I am not certain.You could certainly do as you suggest.You would also use the same project file (if it isn't too big) and just start anew in a new workspace. In this way you will have everything in a single project and can easily compare what…
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Yes, in the workflow sections I demonstrate in extraordinary detail the processing steps and you can follow along with the same data. Regarding Narrowband... Fundamentals explains how the use the stuff you need to understand in order to do the NB wo…
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Thanks Phil. You point about the WBPP updates is valid and well taken.(It really was a moving target in 2020/2021) Your comment about flat darks is not quite right.The problem is there exist really lame cameras that many people that are jumping into…
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This is really excellent! I am glad the technique helped you out...Congrats!!!-the Blockhead
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Hmmm... there are many videos that deal with this. Everything from selective rejection to the substitution of pixel values from another image... so use of the GAME script to minimize this issue.So... I will need a little more information on what the…
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Yes, Wade is correct concerning the CMOS cameras. I forgot to add this point. This is what I mentioned the only benefit in terms of actual signal improvement is through on-chip binning... AND you cannot take advantage of this with CMOS sensors. Sorr…
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Hi Bruce, It gets a little complicated... because you can't just bin (or resample) calibration data willy-nilly. I have a couple of comments.... 1. Hardware binning is the only way to *benefit* from the reduction of read-noise. This is a real effec…
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Hmm...I do not think there is anything to do. However, when you operate on color images the time should be multiplied by 3. It is effectively doing its thing on each channel- and then there might be additional stuff. However, my experience is that e…
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The WBPP videos on the site are identical to those on YouTube (I believe). I would still recommend going through them in order. The changes are incremental- and as you see it evolve in the videos... you will better understand what is point of things…
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Currently NSG requires registered images. Thus, it is not in the drizzle path/algorithm. It may be possible in the future to incorporate NSG with drizzle... @JohnMurphy can speak to that. -the Blockhead
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Hi John, Yes. The readnoise and gain are properties of the sensor. It doesn't matter what color of light is hitting the sensor to make the gain measurement. So once you know the readnoise and gain for your sensor/camera... that is it. You can use th…
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HI Jim, I wish for the same thing! It would be great, for example, to be able to access FITs headers using methods like those found in Astropy to do cool things (as well as matplotlib to graph stuff).. I am not knowledgeable in this area. It is unli…
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Hi Mark, Yeah, I basically made Fundamentals a way to show the important elements of processing in some depth on a number of topics. This "gets in the way" of simply showing work "flows" as such. (But I argue, showing the "flow" without the understa…
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SFS measures images attributes that can be described as affecting the quality of data including things like FWHM, eccentricity...etc. Some of the measures are also related to signal strength and noise (star count). NSG on the other hand measures one…
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OK. That aspect is not possible in Photoshop.-the Blockhead