Originally Posted by Paulie85
Not really sure what do you mean, my TV is not the best on the market, but still really cappable of what you said (you can see reviews, in our country it is KS7000 = KS8000 in the USA).
My question was about different quality of picture with HDR ON from youtube and downloaded samples versus physical UHD BDs.
1- The bandwidth used by streaming sources is much lower than the bandwidth used by a signal from a UHD disc. Netflix recommend a 25Mbps connection for streaming 4K with HDR but the signal coming of a UHD disc can be over 100 Mbps at times and mostly more than 80 ir so Mbps. There's a lot more data coming off the disc. You will see a difference between streaming and disc playback.
2- HDR content uses the BT2020 colour space and has 10 bit colour depth in each channel. When you use the "HDR Off" setting (not the "Strip Metadata" setting), you convert the image to the BT709 colour space which is smaller and does not capture as many colours, and you reduce the colour bit depth to 8 bits which also has an impact. Normal BDs use the BT709 colour space and 8 bit colour depth but normal BDs are mastered for 1080p displays which have lower peak brighhtness capability than a UHD TV. Turning HDR Off may convert a 4K HDR image to the same specifications as a normal BD image but because of the differences in the way UHD and BD versions are mastered, the UHD version with HDR Off is not going to look the same as the BD.
So yes, there are differences and they should be visible.
When it comes to how you see those differences and which one looks better to you, a lot of that is down to your eyesight (not everyone has equally good eyesight or equally good colour perception), your screen and how accurately it renders the image (your settings can make a big difference, as can having your display professionally calibrated), and personal preferences. You see what you see with your TV, other people with different TVs may see something different, and different people viewing the same thing on the same TV at the same time can have different preferences for which version they prefer.
I haven't tried doing comparisons with HDR OFF because I like the way things look with HDR ON on my LG OLED.