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Topics - CRWPhoto

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Bug Reports / Program not responding constantly
« on: 2016 August 13 04:02:09 »
I recently updated to the newest version of PI.  Everything works perfectly (and some things better) but I am always getting the "not responding" when the program computes something memory intensive.  Such as creating a star mask or saving a project.  By not responding I mean the entire screen goes opaque and the mouse pointer spins the blue circle.  Eventually it will work itself out and get back on track and I have not had the program actually crash or stay in that state of not responding... but it does  happen every single time I ask it to do something intensive. 

BTW- I'm running this on a machine with Intel i7-3840QM CPU and 32G of RAM and never had this problem with the previous version of PI.  Just wondering if this is a potential bug or is there a setting I can change somewhere that effects how resources are utilized. 

Thank you!

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General / PixInsight- Dark Border on Two Sides (Whats going on?)
« on: 2016 August 08 11:27:15 »
Hi all.  I've been digging into manual integration and realized that I have a strange border that is on two sides of my frame.  When I open a file (Light, Flat, Bias, Dark, ) it displays this very strange artifact.  See attached:

These are Canon CR2, from Canon 750D.  I'm using PI v 1.8.

Any ideas what is going on here?


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General / Multiple Masks
« on: 2016 July 05 05:35:41 »
I'm not sure if there is a way to already do this...

I found myself editing the veil nebula and really wanted to be able to apply two masks to an image to isolate the nebula.  A really simple way to do this would be to create a Lum mask and clip in HT.  Apply to image, then create a star mask and apply that to the image to further mask off the areas you dont wan to touch. 

I'm guessing that this could be achieved with pixel math, but that is beyond me at this time.  It would be so simple (UI) to drag and drop the first mask, have that tab visible, then drag and drop the second mask.  You could then independently remove and invert those masks depending on what you want to do for edits.  I find myself wanting to do this more and more frequently.  It sounds simple to do, but maybe it is not that simple when executing this in the program. 

I'm not a programmer, and only an amateur user of PI so simple execution of a concept like this would really be helpful.  Does this already exist?  Kudos to the programmers on this program... it is just awesome!  Thank you!

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I just picked up a Canon T6i/750D.  It's cloudy so I set out to start building master calibration frames.

I shot and integrated bias frames and ended up with a pink frame that had no banding noise or anything.  I thought this was very peculiar, so I re-checked my parameters... all looked right, and then decided to open up a RAW file to see what it looked like.

A single RAW image also looks the same... its just a pink file without any noise.  Next I opened a debayered version of the file to see what that would look like... still the same.  A pink file.

These should all look black and upon stretching should show the noise.

When I open the RAW file in LR or PS it displays as a black image, and upon stretching starts to show the banding noise as expected....

Any ideas about this?

Attached is a screen shot of a RAW file.  Bias image.  Shot in the dark with lens cap on.  ISO 1600.  1/4000 second.  No STF or HT applied.

What am I missing here???

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I've had my share of cloudy rainy nights recently and have been thinking about calibration frames.  I can't seem to find a thread on this topic, although I am sure it has been discussed before.   I primarily use BatchPreProcessing however it's no problem for me to create master frames independently, therefore processing time and power usage is not a primary consideration.  These rainy nights give me plenty of time to waste on making the best calibration frames possible. Let's imagine for this thread that we live in a perfect world.  What's best for PI processing?

1) Dark frames.  I've been reading about dark frames and the concept of dark scaling and have come to the conclusion that rather than shoot a quantity of dark frames at the same exposure length as light frames that it is better and more efficient to create a master library of dark frames at various ambient temperatures with LONG exposures (longer than the longest light frames captured)... Then through the implementation of dark scaling, IP will scale the dark frames using noise evaluation to best calibrate with the lights.  For example:  If I plan on only shooting 2 minute subs, create a master dark library of 4 minute dark frames and simply dark scale. Regardless of whether I shoot 2 minute subs or 30 second subs, I can use dark scaling with the 4 minute darks for calibration.  (Any opinion AGAINST using this practice?  Also, how many should be captured?  I understand the math on diminishing returns, but as we will be making a master dark library, and only making each master once, what is the best qty to shoot for?  30 darks?  60 darks? 100 darks?

2) Flat Frames.  This one is pretty straight forward.  A master flat can be re-used over and over as long as the orientation of the optical train and the sensor are kept constant.  Of course, this will not help with dust bunnies or other variable anomalies, AND flats are so easy to take that it is not really a big deal to take them every time.  Either method is likely acceptable.  The big question:  How many? What is the perfect number for PI?  30? 100?

3) Bias frames.  I have read that for an excellent quality master bias frame to have the greatest impact when calibrating darks, flats and lights, that having MANY bias frames is ideal.  With 180 bias frames an excellent master bias can be created and that with 360, an almost perfect master bias can be created.  Is it worth taking 360 bias frames for PI to play with?

Thanks and fingers crossed for some clear skies!

-Chris

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Been using Pixinsight for a few days now.  Absolutely LOVE it and will be purchasing after my trial is over. 

Sorry if this is obvious, but I cannot seem to fingure out how many of my light frames were actually used for a given integration. 

I'm using the BatchPreprocessing Script for Image Integration/Calibration of DSLR Raw Files.  Is this information held within the FITS file that is compiled and/or how can I figure this out. 

I'm trying to find out how much integration time I have for a specific target, but I only know how many files are loaded into the script.... not how many are actually used.

Thanks for your help!

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