A 1920 × 1080 source fits a 2560 × 1600 screen at 2560 × 1440 while preserving its shape. That leaves 160 pixels of unused height: 80 above and 80 below when centred. Filling the whole display instead makes the picture about 2844.4 pixels wide and crops about 142.2 pixels from each side.
The source and screen have different shapes
The source ratio is 1920 ÷ 1080, or 16:9. The display ratio is 2560 ÷ 1600, or 16:10. A larger pixel count does not make those shapes identical. Keeping a circle circular and people in their original proportions means choosing whether to leave space around the picture or crop part of it.
Fit keeps the entire picture
Scaling the source width from 1920 to 2560 multiplies it by 1⅓. Its height becomes 1080 × 1⅓ = 1440. Subtract 1440 from the screen’s 1600-pixel height and divide the remaining 160 by two. Centred playback therefore leaves an 80-pixel band above and below; those bands do not mean the file is missing content.
Fill trades the edges for a full screen
To reach a height of 1600, scale by 1600 ÷ 1080. The resulting width is about 2844.4. Only 2560 pixels fit, so roughly 284.4 are cropped altogether, or 142.2 per side if centred. These are output-display pixels. Scoreboards, captions or faces close to the original edges can be affected.
Choose a reversible display mode
Player labels vary, but fit or original-ratio modes normally aim to preserve the frame, while zoom or fill can crop it. Stretching to the screen’s exact width and height changes the proportions instead. Start with a mode that preserves the picture and inspect the edges before deciding whether a crop suits a particular programme.
A practical sequence
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An example to work through
In this numerical example, an uncropped 2560 × 1440 picture sits inside a 2560 × 1600 display. The alternative fills the panel but loses part of the picture at both sides. Neither calculation changes the source’s real detail or resolution.
Questions about this topic
Do the bars mean the stream is broken?
Not by themselves. They can be the correct result of preserving a different source aspect ratio.
Does filling the screen make it sharper?
It does not create new source detail. It changes scaling and, in this example, crops the edges.
