Deconvolution and Hot Pixels

Alan Karty

Hello Adam.

I was previewing various Deconvolution settings and I noticed that some hot pixels had not been eliminated in  my image.  They really create artifacts in decon.  Any suggestions?

Alan

BlockHead

Yeah, deconvolution requires some really good data. As it happens I will be releasing the latest deconvolution information later today with respect to my update of NGC 3486 in the Fundamentals Workflow section.

You can't fix this from the decon settings side of things. (That would be unfair really, Deconvolution expects to sharpen real signal...and you gave it that with those hot pixels.)

So, you do need to make certain that you have clean images and understand why there are still hot pixels left behind. That is the area of concentration. The combination of Cosmetic Correction and Rejection really do the heavy lifting. But each of these has different methods and parameters. CC comes with Auto, its settings- or you can use the Master Dark method (which almost always works to kill *all* hot pixels if your dark truly characterizes the data). The Rejection comes with a wide variety of algorithms and parameters depending on the number of frames, thresholds (sigma in some cases) and noise.

All of the above doesn't really answer your question- but I hope it points you away from Decon settings and towards earlier processing subtilties. 

If you want to pursue this further, you will need expand in great detail on the the data with screenshots, the methods you used...etc.

-the Blockhead