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Image Analysis (ie plate solving) on a drizzled (2x) image

Brent Jaffa
in PixInsight


So I know when an image uses drizzle integration the resolution & pixel size? is changed. 
Is there a way to account for it in the parameters so image analysis will find the stars and complete sucessfully?
I can run image integration on the non-drizzled image integration but not of the drizzled implementation.

Any help would be appreciated.

Thanks  Brent

Comments

  • BlockHeadBlockHead
    Well.. .first it is possible to Drizzle at 1x so there would not be a change of scale in this case.
    You are correct that Drizzle at 2x will change the plate scale. It effectively doubles your focal length or halves your pixel size (which halves the arcseconds per pixel).

    So if you originally had a 500mm focal length for your telescope and 6 micron pixels... (or a platescale of 2.8 arcseconds per pixel) you would change ONE of these values when you do 2x Drizzle... then the math will be correct.

    So with the above I could double the 500mm to 1000mm (and leave the other two alone)- or I could halve the 6 microns and make it 3 ...etc. 

    Now when you do drizzle 2x the error that Pixinsight will accept is smaller! So you may have to adjust the number a bit to get it to succeed if there is a problem. Instead of 1,000 ... you make it 950 ..That kind of thing.

    Let me know if you are able to do it.

    -the Blockhead
  • Brent Jaffa

    Yes,  THANK YOU  ADAM    

    I double the focal distance and it worked!!  

    Again Thank you !   

    I have enjoy my subscription to adamblockstudios  for the last 3 years. it has been a tremendous help.
  • BlockHeadBlockHead
    Ah... this is good news.
    Lately I have been striking out quite a bit! lol
    -the Blockhead
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