DVDs are not lossless, since MPEG-2 video encoding is not lossless.
If the test pattern is 720x480 or 704x480 or 720x576 or 704x576 then at least it can go onto a DVD without resizing. If it is a still image, there should be little loss at high bitrate, but it's not lossless.
Cheers,
David.
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