QGIS: raster image georeference and overlay

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I've created a grid and points in QGIS which I used to survey. Using a test image at the moment and I'm trying to fit this image as an overlay within a boundary. When I insert the image it has a white background which I can't remove in QGIS.

Image 1 is what the area looks like, I want to get the survey results inside the red line. Image 2 is what happens when I insert the image, the inserted image of the geophysical results is a .BMP file, the same happens with .TIFF files.

The image is moved into place by georeferencing corners of the boundary area or points on the grid.

Image 1:



Image 2:





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