Konstantin reminded in topic http://gimpchat.com/viewtopic.php?f=8&t=17344&sid=cf0b6885c0839c683d9c268342fe83c8#p238197
script-fu scale_pattern.scm (from 2009-04-13) by Rob Antonishen.

Description:
"Scales the selected pattern and puts it in the clipboard to allow it to be used as a pattern.
If larger than 512x512 will save it, refresh patterns, and set the active pattern to be the saved file."

Since I've been having a lot of fun with patterns lately, I've changed this script a bit:

- adaptation to Gimp 2.10,
- added Rotate (angle): 90°, 180°, 270° (attention: not all patterns on the 90° or 270° degree rotation will remain seamless),
- added Transform-flip (ORIENTATION HORIZONTAL/VERTICAL),
- add choosing your own criterion for writing to disk in: gimp-directory/patterns/scaledpat.pat (attention: next time you use it - pattern "scaledpat.pat" will be overwritten)

Thanks MareroQ!

The script creates a blurred pattern outside the selected area.
Then I reverse the selection and remove the shadow.

I didn't understand why this effect blurred.

Sorry, I take what I said about the script create a blur outside the selected area. I was wrong.

Thx MareroQ

I should do it right away : add a name field for save.
Now you can also quickly save the Clipboard Image (active layer in image and Ctr + C) as a pattern.

Thank you so much for the conversion to 2.10 and the script improvements!

MareroQ,

Thank you so much for the update! The 'old' script, by RobA, stopped working when I moved from Windows 7 to Windows 10. Though I still use GIMP 2.8, your update works fine, though I have not tried the new features.

Since I've been having a lot of fun with patterns lately, I've changed this script a bit:

- adaptation to Gimp 2.10,
- added Rotate (angle): 90°, 180°, 270° (attention: not all patterns on the 90° or 270° degree rotation will remain seamless),
- added Transform-flip (ORIENTATION HORIZONTAL/VERTICAL),
- add choosing your own criterion for writing to disk in: gimp-directory/patterns/scaledpat.pat (attention: next time you use it - pattern "scaledpat.pat" will be overwritten)[/quote]

Does this require GIMP 2.10 for the new features to work? I am using
2.8 and the scale part works, but I see no options come up for rotation.
The dialogue box only has the slider for scaling. But, on right clicking the pattern, the initial dialogue box says "Scale-Rotate Pattern".

I have been holding off switching to 2.10 as I heard (Usenet NG) about issues with 2.10.

thanks for any pointers/advice

Hi Tictocroc.

The modified script should work for Gimp from 2.8 to 2.10.
The reason for the problems (the most common) is the simultaneous use of the older version with the newer one
(they have the same registration procedure in the so-called PDB - but sometimes a different name/location in the Gimpa menu and different names of the scm file itself).

This is an opportunity to remind two perfect script:

Test for duplicate scripts by Kevin Payne "paynekj"
http://gimpchat.com/viewtopic.php?f=9&t=3057

JGimpOS - managing scripts by Onkel Hatti
http://gimpchat.com/viewtopic.php?f=4&t=6028

I use both when I install (lazy) many scripts at once or when there is a script error message.
Try to search and let know what the result is...

[quote="MareroQ"]Hi Tictocroc.

The modified script should work for Gimp from 2.8 to 2.10.
The reason for the problems (the most common) is the simultaneous use of the older version with the newer one
(they have the same registration procedure in the so-called PDB - but sometimes a different name/location in the Gimpa menu and different names of the scm file itself).

Thanks!!!! And, right you are.

I normally keep these "enhancements" in my personal "user"/.gimp-2.8 directory.
That one did have the new script. But, the GIMP installation directory (in ProgramFiles)
had the old one. I deleted that and now things work just as advertised.

Thanks for pointing this out. In the future, I will check to see that there is no "duplication" going on. I did try using the plugin directory search under "Help", but I may not have been paying close attention to what it picked up.

Thanks again.