Author Topic: Blink, Again  (Read 208 times)

Offline sreilly

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Blink, Again
« on: 2019 April 08 06:16:09 »
So this is a feature I haven't used much but playing around with it I see it as very useful. Loading images and blinking through them gives you a very good first idea of what's usable. But what I'm seeing is not a great AutoSTF for anything but the first image and that being applied to the rest. Is it possible to apply an appropriate STF to each instead of one for all? The other possibility I see is just loading images all used by one filter and run those separately. Say load all luminance images and run those then the load say red, then green, and finally blue. Or the NB filter selections by group. Point is I guess there's no good way to blink all unless they've been stretched already (nonlinear). Am I wrong about this or missing a feature?

I guess maybe blinking the raw data isn't the best use where blinking say the calibrated and stretched images may give a better representation of the data itself. Case in point is loading of all data from a single image for a nights imaging session looking for any outliers that may be asteroids or other unexpected objects. Loading out of sequence may not be as easy to see these events especially if you acquire data sets as I do by rotating through the filter stack by a set timed period. If I'm taking say 15 minute images I'll do a set of 1 hour exposures for the filter and it may do multiples or a single before moving to another filter or even possibly another object depending on the priorities set. Anyway thought I'd ask.
Steve
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Offline bulrichl

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Re: Blink, Again
« Reply #1 on: 2019 April 08 07:00:11 »
Hi Steve,

in the Blink window (above) you see two big icons that control Blink's behavior regarding the STF stretch: the lower icon (Compute AutoSTF for the current image, then apply the computed STF to all images) is selected by default. However, when you select the upper icon (Apply an automatic histogram transformation to all images) the AutoSTF is computed for each of the images and they are then displayed accordingly. I hope this helps.

A second feature of Blink that I use often is "Series analysis report", activated by a click on the little bar chart icon at the bottom. You can initiate an output of the statistical data of all checked images as a CSV file by checking 'Write text file'. You can choose an output directory, the data range (0.0 to 1.0 or 0 to 65535) and the number of decimal places of the statistical data. CSV files can be imported in spreadsheet software like LibreOffice or OpenOffice where you can calculate with or plot these values.

Bernd

Offline sreilly

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Re: Blink, Again
« Reply #2 on: 2019 April 08 11:27:04 »
Thanks Bernd, I guess I didn't think this through far enough as I was thinking it was applying a permanent stretch. Maybe still too tired from the NEAIC conference this past weekend......
Steve
www.astral-imaging.com
AP1200
OGS 12.5" RC
Tak FSQ-106ED
ST10XME/CFW8/AO8
STL-11000M/FW8/AO-L
Pyxis 3" Rotator
Baader LRGBHa Filters
PixInsight/MaxIm/ACP/Registar/Mira AP/PS CS5

Offline STEVE333

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Re: Blink, Again
« Reply #3 on: 2019 April 11 08:28:01 »
One additional thought.

You probably already know this, but, if you uncheck the Link icon (looks like two links of a chain) the displayed colors in the image will be much more "natural".

Steve
Telescopes:  WO Star71 ii, ES ED102 CF
Camera:  Canon T3 (modified)
Filters:  IDAS LPS-D1, Triad Tri-Band, STC Duo-Narrowband
Mount:  CEM40 EC
Software:  BYEOS, PHD2, PixInsight
http://www.SteveKing.Pictures/