All sizes as seen already inside my answer for this posting. Here again 
(copied from my previous answer here):

Hi Stefan,

usually, the traditional TV standards (NTSC, SECAM and PAL) feature low
screen resolutions between 720H480V to 720H576V (horizontal/vertical)
pixels. That means, your pictures don't need to be much bigger, unless they
want to have a full-detailed camera move above it. If it is a plain display
of your image, these screen resolutions should be okay.

But in any case, I suggest that you start a brief communication with them,
as well. Whatever rules do exist in theory, the praxis of life can look
quite different.

Here are some useful links:
http://www.mtxindia.com/An1.htm
http://kropla.com/tv.htm
http://www.digitalfernsehen.de/specials/df_12735.html (don't care for the
language, just take the numbers of pixels, very easy)

Greetings,

Sven

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