Author Topic: Comet Lovejoy Processing Problems Newbie  (Read 1944 times)

Offline gunny

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Comet Lovejoy Processing Problems Newbie
« on: 2015 January 14 20:26:44 »
  I'm relatively new to PI  and am rather frustrated at my attempts to process my images of comet Lovejoy with both Pi and Maxim dl6.  PI does a great job of dynamic cropping and linear fit along with other features that maxim doesn't offer.  Maxim is easier for calibration and stacking to get my masters.

  I generate my master darks and bias'  for calibration with Maxim, along with master l, r,g,and b frames.  Screen stretch in maxim shows 0 to 65400 as you would expect for the l,r,g,and b.  Once I bring those into PI and perform the linear fit after dynamic cropping, the screen stretch drops to extremely low numbers in maxim.  In performing all the steps to get an rgb color image that looks great in PI, if I move  that same image to maxim, nebulosity, or ccdstack, the screen stretch functions are in the range of 008 to 100 or less.  Not the typical 0-65k range I would expect .  Trying to apply photoshop curves to the rgb image will not work either after converting to tiff format.

   I maxim I'm using 32 bit IEEE format to save the images of l, r,g,b and wonder if that may have something to do with a proper transfer to PI for further processing.  I've worked on this for three days now and I'm stumped..........HELLLLLP!

   Again, thanks for any assistance that you can provide..................Gunny

Offline astroedo

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Re: Comet Lovejoy Processing Problems Newbie
« Reply #1 on: 2015 January 15 07:44:10 »
Hi Gunny it's perfectly normal that you find tiny values in PI:
It works on normalized images so all your values lay between 0 and 1 (where 1 means the maximum value allowed by your dynamic range, 65536 in your 16 bit images).

Less normal is that you find different aspect opening the image with different software.

Which is your work flow in PI?
Which processes are you using?
Could you share an image on dropbox just to understand better the problem?

Bye
Edoardo Luca Radice
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Offline gunny

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Re: Comet Lovejoy Processing Problems Newbie
« Reply #2 on: 2015 January 16 14:17:13 »
Hello Astroedo,

   After experimenting, I found that I had to convert the images to 16 bit format in either fits or tiff to get the images to xfer to other software.  The 32 bit IEEE format would not work.  If you think that this is wrong, please let me know........Thanks for your help and the information...............Gunny   

Offline astroedo

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Re: Comet Lovejoy Processing Problems Newbie
« Reply #3 on: 2015 January 18 10:43:39 »
I suppose it's completely correct.

I always export TIFF in 16 bit format.

Very Strange the behavior with FIT in 32bit, maybe the software you are using does not supports this format  ???
Edoardo Luca Radice
L'arciere celeste
My Gallery on Astrobin
10Micron GM2000 QCI V.2
Celestron C 9.25
Modded MTO 1000 f/7.28
Canon 350D Baader
Magzero MZ-5M
Lumenera SkyNyx 2-1C