I have looked for this as well… great question.
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We always advice to use web quality and don´t upload any HDR, RAW or 50MB jpgs.
- Best to use png
- 200x 150 for the profile picture
- 1000 x 750 for the secondary photos
- Banners: 2000 x 150
- Group avatar: 300 x 300
this is by far not complete but usually this works just fine
In addition to Peter's suggestion. As many of the image elements in a Jive instance are dynamically sized based on browser width, the most accurate way to check a specific image's size for a particular instance is to use your browser's built in developer tools to pull up the images dimensions. For example in Chrome r-click >> inspect