Switching to PS for High Pass Filter

Alan Karty

Adam,

A colleague suggested that applying a High Pass Filter in PS, once for bright areas and once for dark areas, with appropriate masks, could enhance my PI image.  Any thoughts?  Good idea, or PI can do better and I haven't exploited it?

Should I export to PS, I would return to PI as a FITS file for the rest of the way, disconnected from the previous History Explorer?

Thank you for your time.

Alan

BlockHead

The high pass filter enhancement (typically with Overlay blending mode) is applied to stretched images- not linear ones. So you would not be saving a FIT file- but rather a TIF file.

That being said, you can use the blending modes of Photoshop within PixInsight. So there isn't a need to switch programs. The PixInsight analog to the high pass filter effect is adjusting the bias on the layers of MMT. 

LocalHistrogramAdjustment is very much like blending with soft light.

You can also download a script called Blend... it has all of the Photoshop blending modes. You interact with it as if you have two layers.

Using masks for the bright and dark areas is obviously easily done in PixInsight. Just make the appropriate mask (and object mask... see my tutorial on it).

-the Blockhead

Alan Karty

Thank you.  TIF is what I meant.