I know this question has been asked already in this forum, but I couldn't find an easy (for me, a rookie) solution for my problem. I have an RGB 3 band file which, in some pixels, has i.e.
R no data G 147 B 147
This creates problems in the visualization of the raster. I'd like to know how to change those values to 0, enabling the colours to be correctly displayed again. I tried to use an algorithm in the processing tab, but it says SAGA algorithms are not supported by multiband layers. Also I've seen many using GRASS tools, but I really have no clue on how to use GRASS, so I would need a step by step explanation. Consider I am still a newbie with this software so, if possible, I'd like use the easiest method.