Hi @manunes,
Welcome to the Pix4D community .
To remove the transparency and have 0,0,0 values, please follow these steps:
- Go to Processing Options
- Select 3. DSM, Orthomosaic and Index
- Open the DSM and Orthomosaic tab
- Go to Orthomosaic
- Make sure that GeoTIFF without transparency is selected
Cheers