Hi @roma.avp,
You make interesting remarks. I suppose your remarks relate to the digital tuner programmes. I believe you should be able (this might be locked, depends on different factors) to tune manually two subsequent channels to the same programme frequency on your TV. Then retry your test. So as an example you tune ITV1 both to channel 001 and 002 manually then zap between them to look for the bug you mention.
Generally speaking these kind of tests would require an SMPTE test signal generator and a professional colourimeter to measure the offset. Yes, all programmes from different broadcasters comply with the same REC.709 colour space standard for SDR signals, but every single programme (shows, movies, documentaries, news, etc.) and I even dare to go as far as saying every single scene from the same programme (in more advanced formats even frames of the same scene) are colour corrected differently by the colourist during the post production. This makes it impossible to measure differences if you are zapping from one channel to the other, as the whole colour processing scheme behind both channels is never the same. This despite the colour processing done according to your settings on the TV remains the same during the zapping.
Cheers,
Dutchice
