xp startupscreen help

Hello

I've used ResHacker to try and add my own startup screen, which works. The problem is that when the screen comes up after restarting it is all pixelated and there are blotches (or pixels I suppose) or random colour. What is going on. I've reduced the image I used to 4bit color.

Follow these directions:
http://www.thetechguide.com/howto/xpbootlogo/

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thanks for your help