One option that you could do is change the element that was white with a black background that shows black when you change the background to white from 0 to 253, which is a black color. Another option would be to set the color mode to monochrome on your output image rather than RGB. You can create your output file as a GeoTIFF or an Internet TIFF or a TIF image with a sister file and it will save the location where the output image is attached.
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