I have a raster (TIFF file) and I would like to draw a mask on it. So, I basically create a shapefile and draw polygons on the area I wanted to mask. Then, I would like to rasterize this shapefile by creating a raster with the same extent than the raster file. This new raster must have only 0 and 1 values (1 for accepting value, 0 for not accepting).
The problem is that with the common Vector to Raster on the default plugin of QGIS, if I select the raster to get the extent (on the options), it's creating a TIFF with the initial raster value and change only the value on the polygon.
I can't draw these kind of mask on PhotoShop because the TIFF is on int16 and so, if I open it on PhotoShop I have a black image.
At this stage, the image isn't referenced. I just want to overlay a mask of 0-1 value upside the initial raster.
Is there a simple way to do tha? I can't find anything on the web... Plugin "Mask" don't do what I want.