PixInsight Forum (historical)

PixInsight => General => Topic started by: eds on 2018 July 04 12:39:27

Title: PPC failed due to drizzled data
Post by: eds on 2018 July 04 12:39:27

My data is undersampled so I use drizzling in my process. When I tried using PPC it failed to plate solve because could not find minimum 6 stars. Tried every server still failed to plate solve. So, I thought maybe the process of drizzling changed the stars so they were not recognized or changed the plate scale.
Created a new RGB image without the drizzling process and PPC works perfectly. I know I can do background neutralization and color calibration but am curious as to why PPC failed with drizzled data.
Thanks,
Ed Stuckey

Title: Re: PPC failed due to drizzled data
Post by: pfile on 2018 July 04 12:49:26

it changes the plate scale, set it to 1/2 whatever it was in the original image.

rob

Title: Re: PPC failed due to drizzled data
Post by: eds on 2018 July 04 12:53:33

Thanks. I am relatively new to pixinsight, how do I changed the plate scale. I am using RGB subframes, do I change plate scale in each RGB channel before combining them?
Ed

Title: Re: PPC failed due to drizzled data
Post by: eds on 2018 July 04 13:27:43

Found the answer. Thanks
Ed