Notice: This is just a rough guide to give you an idea of how to operate the software.
I might have made some mistakes, also some essential steps might be missing.
A nasty centripetal gradient (hot spot at center and fall-off to the corners) can be removed with DBE method in PixIS.
We have to mark many points in which the background looks nice and appealing by clicking the left mouse button
Lots of "x"es show up and represent the areas we refer to as good. Make sure not to mark any bright regions like
stars or the object itself as it would affect the resulting flat seriously! Depending on the size of the image place some 100s of points.
This is how the arteficial flat looks like. This has to be subtracted from the orginal.
(Due to reduced resolution and jpg-compression this demo might look inferior - please try it out yourself and you will see!)
Open up Pixel Math and activate the flat to be subtracted from the original file by clicking "new" and then select the
original file (Image01_background) as the operand.
The final result can be stored as 16 bit tiff file for further processing in PS.
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My gratitude goes to Rocky Hess, who has perfectly helped me comprehend this software.
Any comments on this tut? Please contact me.