Define the width and height of both member and group Buddypress avatars.
Creating your own custom avatars could be useful as well, should you want a higher resolution image for retina displays – but at the same time retain the original sizes for regular Buddypress thumbnails and full-size avatars.
These custom sized avatars could be linked in conjunction with custom buddypress group avatars.
bp-custom.php
define('BP_AVATAR_THUMB_WIDTH', 100); // marked in px
define('BP_AVATAR_THUMB_HEIGHT', 100); // marked in px
define('BP_AVATAR_FULL_WIDTH', 250); // marked in px
define('BP_AVATAR_FULL_HEIGHT', 250); // marked in px
// create your own avatar sizes
define('BP_AVATAR_CUSTOM_WIDTH', 450); // marked in px
define('BP_AVATAR_CUSTOM_HEIGHT', 450); // marked in px
