Question regarding image format

[Andreas Heinlein]

Hello,

I am currently trying to create my own plymouth theme, using 
plymouth-script. I have created a background wallpaper which displays 
fine when using plymouth-x11 for testing. But when actually used on 
boot, all I can see is colored vertical stripes. I suspect there is 
something wrong with the image format.

It is a PNG with a resolution of 1920x1080 (will be scaled by the 
plymouth script). No transparency is used. I tried using indexed colors 
too, but it seems to make no difference.

The progress meter on top of the image shows fine in any case.

Thank you for your help,

Anreas

P.S.: The relevant script snippet:
screen_ratio = Window.GetHeight() / Window.GetWidth();
wallpaper_image = Image("wallpaper.png");
wallpaper_image_ratio = wallpaper_image.GetHeight() / 
wallpaper_image.GetWidth();
if (screen_ratio > wallpaper_image_ratio)
   {
     scale_factor = Window.GetHeight() / wallpaper_image.GetHeight();
   }
else
   {
     scale_factor = Window.GetWidth() / wallpaper_imager.GetWidth();
   }
scaled_wallpaper_image = 
wallpaper_image.Scale(wallpaper_image.GetWidth() * scale_factor,
wallpaper_image.GetHeight() * scale_factor);
wallpaper_sprite = Sprite(scaled_wallpaper_image);
wallpaper_sprite.SetX(Window.GetWidth() / 2 - 
scaled_wallpaper_image.GetWidth() / 2);
wallpaper_sprite.SetY(Window.GetHeight() / 2 - 
scaled_wallpaper_image.GetHeight() / 2);

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