4K and HDR are two very different things.
4K refers to the resolution, or number of pixels on the screen. If you're watching 4K HDR or just 4K, it's still 4K resolution. You'll only be watching 1080p if the TV channel is airing content originally recorded in 1080p. 4K content is not yet nearly as widely available as 1080p is.
HDR or High Dynamic Range refers to the color and contrast of the image.
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- HD is not an exact term. It can refer to 720p, 1080i or 1080p.
- Your 4k TV always shows a 4K image because it upscales every source to 4K to fill the screen. So a HD source will be upscaled to 4K.
- Upscaling interpolates the missing data from a lower resolution signal and creates a 4K image.
The answer to your question is that you will see the HD signal upscaled to 4K. It will not have the image quality of a true 4K source but you are seeing a 4K image because you have a 4K TV.
the movie "bundle" offers a 4K HDR version and an HD version. if you don't have an HDR TV - even if you have a 4K SDR TV - you will not the 4K HDR version. You will be shown the HD version. Here's a link that talks about this: https://www.telus.com/en/bc/support/article/hdr-high-dynamic-range-explained?INTCMP=VAN_hdr-support#...
Also, if your TV is younger than 4 yrs. old many brands do offer 4K with HDR - double check your TV? https://www.telus.com/en/bc/support/article/hdr-high-dynamic-range-explained?INTCMP=VAN_hdr-support#...