Dear antonio19812,
If you need to export S2 image at full resolution (10m/pixel) you should visualize the RGB on your screen and set up the histogram as you wish, once opened you should right click on the window and select ‘Export View As Image’
In the export pop-up window you can select:
- format (TIFF is recommended)
- Image Region (View or Full Region)
- Image Resolution (Full resolution)
For TIFF format, by definition, please be informed that the maximum size is about 20000 x 20000 px.