Many thanks for the new features.
I tested new functions - everything works.

Two minor problems:
- There is a problem when you use the selection
preview (strange shift) - but the result is correct.
- In case of using alpha channel (transparency) it has to be added to the image before using any plugin.

Are You going to add the last missing ones (PF_BRUSH, PF_CHANNEL, PF_DIRNAME, PF_FILE, PF_FILENAME, PF_VECTORS)?

Hello,
Thanks, MareroQ, for your very valuable feedback.

I have not even thought about the possibility of making a selection before using a filter.
This problem seems more complex to fix.
I don't understand.
I hope so. But, I would want to present a "GEGL graph" tutorial firstly.