Invert colors of a ScreenShot

[Ingo Klöcker]

On Mittwoch, 2. April 2025 08:45:30 Mitteleuropäische Sommerzeit bnacht wrote:
> HI,
> 
> for documentation purpose I do ScreenShots with Spectacle. I want to
> invert the colours of the ScreenShots and use 'convert <infile> -channel
> RGB -negate <outfile>' at the CLI afterwards.
> 
> I think this could be simpler ...
> How to create a entry in a context menu (e.g. from Dolphin) to call a
> little bash-Script to do this?

Neither Spectacle nor Dolphin are KDE PIM apps. You'd better use the general 
kde at kde.org mailing list or the forum.

Anyway, you'll have to add a desktop file for a suitable bash-script to 
~/.local/share/kio/servicemenus/

Something like this:
```
[Desktop Entry]
Actions=invertcolors
Type=Service
MimeType=application/png;

[Desktop Action invertcolors]
Name=Invert colors
Icon=image-png
Exec=convert %f -channel RGB -negate %f.inverted.png
```

If you do it right then you'll get a context menu entry "Invert colors" in 
Dolphin in the Actions submenu.

Regards,
Ingo
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