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WherobotsDB offers some APIs to aid in easy visualization of raster results.

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Visualize raster images

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Base64 String

The RS_AsBase64 encodes the raster data as a Base64 string and can be visualized using online decoder. 
SELECT RS_AsBase64(rast) FROM rasterDf

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HTML Image

The RS_AsImage returns an HTML image tag, that can be visualized using an HTML viewer or in Jupyter Notebook. For more information please click on the link. 
SELECT RS_AsImage(rast, 500) FROM rasterDf
The output looks like this:
Output

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2-D Matrix

WherobotsDB offers an API to visualize raster data that is not sufficient for the other APIs mentioned above. 
SELECT RS_AsMatrix(rast) FROM rasterDf
Output will be as follows: 
| 1   3   4   0|
| 2   9  10  11|
| 3   4   5   6|
Please refer to Raster visualizer docs to learn how to make the most of the visualizing APIs.