... saving your disk space which is something that we are gearing towards as well by reducing some different variant of the profile pictures, cover and photos in EasySocial 2.0
Moving forward, we will aim at only having at max 2 files for a particular image.
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https://stackideas.com/forums/uploaded-photo-sizing#reply-303210
Currently when you create a new profile picture, it generates 4 cropped thumbnails. One of the variations is a duplicate (the large one). You can see this by comparing the two:
https://peakfun.com/avatar/users/107/c30975e3b321d15e0e31773ae3c01892_square.jpg
https://peakfun.com/avatar/users/107/99ec27ab14e9494504a597b041fe1d6f_large.jpg
If it helps, download the "/avatar/users/107" directory to see the 4 variations.
The square one is used for the profile, hence making the large the image to remove. The file size is exactly the same as the square one. Due to the large not being used in any capacity, I only see it as a negative due to it consuming more space.
Regarding the number of images. 2 is ideal (32 x 32 and 180 x 180). However I wouldn't be opposed to 3 due to it displaying a nicer image in the article comments.