I second what Jim is saying. But then, I'm not positive that I understand your query. You might want to make sure that we are understanding your question.
Tan is really not good for serious viewing.
- What DVD player are you using? What is your Hidef source? How are these sources connected to the X1?
- What firmware are you using (i.e.: 3.6, 4.1, 4.3?)?
- Have you changed the settings of Brightness, Contrast, etc.? What are your numbers in these settings?
If you haven't done so before you may also want to check out Technut's unofficial X1 FAQ here
for lots more information. It is excellent.