I have a multi-row table view where an image represent the people who are associated with the row. Each row can have n number of people. How may I show a single thumbnail when members are more than one person?
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A stacked group with the face of the last submitter is what I would consider. With the ability to expand the stack and see all involved.
You can also create smaller thumbnails depending on the number of members. For instance if there are 2 people, you can generate two smaller thumbnails. Like this, you can generate a maximum of 4 thumbnails. If the number of people is greater than 4, you can show 3 image thumbnails and the 4th one can contain a number e.g +1, +2 to represent the additional members.
If a (possibly sliding) image-row is not an option and you need to show all users you could consider a single morphing thumbnail showing all of them.
(Better without causing people epileptic seizures)