I was wondering why the splash screen is not visible anymore after using Gimp 2.8 to create the *.bmp file. It’s the color profile option that needs to be deactivated. Here’s the workflow:
Create a splash design with Inkscape:
Width: 455 px
Height: 295 px
Export the design to *.png format (90 dpi).
Then open the *.png file with Gimp and export it to *.bmp format.
Use the options:
> Don’t write color information
> R8 G8 B8
That’s it :-).