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You could use GRUB_BACKGROUND and set an image in your /etc/default/grub. e.g.

GRUB_BACKGROUND="/boot/grub-splash.tga"

You'll have to place an image that can be used by grub2 at the specified (available at boot) path.

jpg, png, tga are acceptable formats.

You may use the file command to check the resolution. Check that your image is RGB.

You may use ImageMagick's convert or GIMP to properly forge your background image. Don't forget to update your grub.cfg running grub2-mkconfig after your modifications in /etc/default/grub.

You could use GRUB_BACKGROUND and set an image in your /etc/default/grub. e.g.

GRUB_BACKGROUND="/boot/grub-splash.tga"

You'll have to place an image that can be used by grub2 at the specified (available at boot) path.

jpg, png, tga are acceptable formats.

You may use the file command to check the resolution. Check that your image is RGB.RGB and that's at a sane resolution.

You may use ImageMagick's convert or GIMP to properly forge your background image. Don't forget to update your grub.cfg running grub2-mkconfig after your modifications in /etc/default/grub.

You could use GRUB_BACKGROUND and set an image in your /etc/default/grub. e.g.

GRUB_BACKGROUND="/boot/grub-splash.tga"

You'll have to place an image that can be used by grub2 at the specified (available at boot) path.

jpg, png, tga are acceptable formats.

Check that your image is RGB and that's that it's at a sane resolution.

You may use ImageMagick's convert or GIMP to properly forge your background image. Don't forget to update your grub.cfg running grub2-mkconfig after your modifications in /etc/default/grub.