The issue was resolved by substituting UTF-8 with UTF-16：

(set-default-coding-systems 'utf-16)

​

https://preview.redd.it/aego1de5zbzb1.png?width=730&format=png&auto=webp&s=838c4970dfcbc6e3025d9932794796e68157f02b

The issue of setting a light-colored background for SVG images in org-babel can be resolved using gnuplot’s own settings.

` set terminal svg background “#ffffff” `

​

https://preview.redd.it/a5o9vtozfnxb1.png?width=575&format=png&auto=webp&s=b96967b2a9c85d4c454e9ec899f2be33e4dadabd

Thank you for the information provided. This confirms that it is indeed not a new feature of version 29.

Yes, I understand it better now.

agreed, this OS is amazing.

PGTK

thank you, I will try it.

Yes, it not support Windows temporarily:

This feature is supported only on X Windows, Haiku, and Nextstep (macOS or GNUstep

That does not matter at all, I rarely have such a requirement to move file out from emacs, since it could easily move around within Emacs.

One could run gnuplot in mind to draw a graph with very limited lines, but impossible to get such a job done with large amount of matplotlib’s code.

great book ,thank you.

Sure, see the org file: https://github.com/AbstProcDo/Master-Emacs-From-Scratch-with-Solid-Procedures/blob/master/Casting-spells-in-plantUML.org