What does Image scaling mean?
Image scaling maps one pixel grid into another, enlarging or reducing a picture to fit a display or output mode. It is a normal part of showing sources with different dimensions on a fixed-pixel screen.
Why it matters
A scaler estimates output samples from the available source information. Its choices can influence edge smoothness, texture and ringing, but cannot recover original detail absent from the source. Scaling can happen in the player, television or both. A fixed 4K output and a native-resolution output may therefore place the main scaling job in different devices.
A practical example
An HD channel filling a 4K panel needs enlargement somewhere in the chain. Compare the same scene with supported output modes if you want to judge the scaler, keeping sharpness and other picture processing stable so the test isolates the actual difference.
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