When the orthophoto is created, Pix4Dmapper assigns the values 0,0,0 to the pixels outside the orthophoto, which are used to fill the rectangular format of the file. This leads to confusion when the orthophoto is analysed for mapping purposes, as there are also pixels in the orthophoto which have the value 0,0,0 but which represent real data. Is it possible to replace the value 0,0,0 for fill pixels outside the orthophoto perimeter with the value “no data”, to avoid confusion with data pixels inside the orthophoto?
Unfortunately, there is no method for setting the pixels to NoData. You might need to use a GIS software or a photoprocessing software to make the changes. Sorry for the inconvenience.