I would like to change file format from TIF to ECW having no data values to be 0 (rgb color unsigned 8bit). I converted output data type from unsigned 16 bit to unsigned 8 bit when I imported the TIF file. The imported image includes a white background and I would like to convert white background pixel value to 0. It is necessary since I would like to use for web mapping.
You can convert the white pixels to black using a simple spatial model. You need to change the pixels with a value of 255 to 0. Please review the discussion topic linked below to view an example of the spatial model used to perform this task and information about handing NoData in the Spatial Modeler.
Hexagon Geospatial Support