I queried with Samsung the meaning of 'Colour space auto' and this is their reply:
Colour Space - Auto, would take a portion of the source's pixels and
adjust it automatically by determining what colours are displayed and
adjusting them to be as natural as possible. The benefit of this is some
programs may be broadcast dull or too light and the TV can attempt to
change this for a better viewing image.Oh dear - so a programme like '20,000 Streets Under the Sky', which was made to look 'sepia' for artistic reasons, would find the colour wound up. I don't think so.
I now have the colour space set to Native and the colour control back to the nominal 50.
Samsung have also promised to feed back my comments regarding overscan and widescreen switching to the appropriate department although there is no guarantee of action.
I have also been checking the delay through the TV so that I can set the compensating audio delay on the scaler correctly. I don't have the means to check video delay directly, so on the assumption that Samsung have got their own audio delay right, I decided to check that instead. I used the sound from the BBC A/V Sync Test as the source. I fed the video from the scaler into the HDMI/DVI input to keep the TV on 1080p. I fed the audio into 'DVI Audio In' and took the output from the headphone jack. I used an oscilloscope to check the delay.
The result is that the delay is 120ms which is exactly 3 frames (PAL). Therefore for NTSC the delay will be 100ms (I didn't test this but it certainly looks right on programmes).
So assuming Samsung have got the audio delay right I have set my scaler accordingly and it definitely looks right. In the worst case (PAL interlaced source) where a lot of the scaler audio delay is used up correcting for its own deinterlacer, I can only just get enough delay but at 112ms it's near enough.
