Resolution
Pixel count in an image or video frame (e.g. 1920×1080 = Full HD). Higher resolution = more detail but larger file. Downscaling (4K → 1080p) loses detail permanently.
Pixel count in an image or video frame (e.g. 1920×1080 = Full HD). Higher resolution = more detail but larger file. Downscaling (4K → 1080p) loses detail permanently.