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The percentage slider is a simple way to quickly decimate render resolution for faster concepting, so you don’t have to input numerical values each time to test different resolutions.
If you set a render resolution of 4K and percentage to 50%, the output will be 2K. No up/down scaling is involved.
The resolution settings only apply to the F12 render. Preview render, aka. viewport render will always override rendering dimensions.
Tip: You can go past 100%.
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