1. Here's how

The largest render resolution in Lumion is Poster resolution (7680x4320 pixels).

1.1:  Render the Lumion image in an uncompressed file format (e.g. .PNG or .BMP) so that there are no compression artifacts as can occur with JPG.

1.2:  If you chose to render using the Print or Poster resolution then make sure to include the Print Poster Enhancer Effect.

1.3:  Consider using a dedicated image re-scaling tool such as SmillaEnlarger or BenVista PhotoZoom Pro to re-scale the Poster image to the desired resolution:

Free online AI upscaler:

• External Link:  Bigjpg
• External Link:  Waifu2x

or:

• External Link (free): SmillaEnlarger
• External Link: BenVista PhotoZoom Pro
• External Link (AI upscaler): Topaz: A.I. Gigapixel

See also:

• Knowledge Base: How do you adjust the DPI (or PPI) for your renderings?