PixInsight: Galaxy NGC474 CHI-1-CMOS one click and dull colors - trying PCC and APASS catalog first time -

[Tryggve Dyrvik]

Hi, I am inside in rainy weather processing NGC474 galaxy and friends - NGC474region- (some one-click's), I use stack in Astro Pixel Processor and FITS channel comb in PixInsight, but get dull colors. (I also tried comb RGB i APP with approx. same resault). I then follow Adam Block on his youtube PCC tutorial. I downloaded the APASS DR9 XPSD catalog on my computer, put it in OS Disk C user, but PCC couldn't find the catalog. Removed it to PI folder, but PCC couldn't find it. Automatic- no, same. First time I am trying any of those star catalogs. 

Edited September 28 by Tryggve Dyrvik

[Tryggve Dyrvik]

21 minutes ago, Tryggve Dyrvik said:

Script-Render-CatalogStarGenerator and APASS, but same outcome.

 

Edited September 28 by Tryggve Dyrvik

[Astro Newbie]

Hi Tryggve, 

Part of the messages shown implies that the image has no Astrometric Solution, hence it cannot match the image to its database. This often happens during the processing of an image when the existing data is lost. Cropping and/or rotating an image are examples where this happens. 

Select the SCRIPT tab in pixinsight, then, Image Analysis and finally ImageSolver. With Active Window selected, the coordinates and Image scale need to be provided. What is shown may be from a previous image hence will fail. The coordinates can be found in many ways and the Image scale, in this example, is 0.389. Entering the focal length of the CDK24 plus the binned pixel size, 3962 and 7.52 respectively will give the same result. The observation data does not need to be very accurate if it is not available. Having carried that out successfully PCC or SPCC should complete. Hope this works. 

Cheers and CS, Ray 

 

[Alexander Curry]

Hi Tryggve,

I believe the "best" method has shifted to spectrophotometry-based color calibration. This uses the DR3/SP catalogue instead; installing this can be done by following the pixinsight documentation: https://pixinsight.com/doc/docs/SPCC/SPCC.html

There is also a good discussion on the PI forum around the two and their best practices: https://pixinsight.com/forum/index.php?threads/pcc-vs-spcc.22544/