High Pass filtering 2.8 vs. 2.10

[Espermaschine]

(10-15-2019, 05:09 PM)rich2005 Wrote: I did not really recognise that RobA Gimp 2.8 procedure.

He describes the procedure on his web-blog:
http://www.silent9.com/blog/archives/152...lugin.html

Quote:They are all straightforward, using the basic "duplicate, blur, invert, 50% opacity, merge down" process

You can easily test it yourself in 2.8:
duplicate image
desaturate
invert

the image does not turn gray unless you reduce the opacity to 50%. And the details will come out after you applied the Gaussian Blur.

I guess there are several ways to skin a cat. In the end what matters is to filter out all of the low frequencies so you are left with the details.