BigTable is a key-value-based storage system, and I am not sure if it can store images. I think blob storage will have the images stored and the metadata could be stored in bigTable or similar.
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“The primary use-case, as explained in the BigTable whitepaper, was storing full websites (that can be large). This means that we can easily store thumbnails (few KBs on average in case of YouTube) in the wide-columns of BigTable. If data is way too large (like tera-bytes onwards), we can put it in blob and put the link to that blob location in BigTable.”
Hope this answers your query.
Happy learning! 