Often times, you are left with black boarder around an image you manipulated in QGIS as seen below. This is often cause because there is no data to display around data part of the image.
Here is how to get ride of the black background in QGIS 3.
Open the raster image layer property window and select the 'Transparency' tab. Then enter '0' under No data value >> Additional no data value.
Click 'Ok' to apply the changes. Your raster image should now have no black background color surrounding it as seen below.
That is it.
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