Question on Image display

Hello,

We will be leveraging the Community API to pull in content that will be displayed on an external website. We will be displaying the most recent forum posts within a specific category. Each post will display the following:

1. Avatar Image

2. Post title

3. Post date

4. Post Author.

If you look at the attachment the Avatar images are of different sizes. Is there a way to get the images in a standard size ( 1:1 aspect ratio)?Here is the link to the Avatar section of the API. 

Also what is the purpose of media_display_size ( see https://community.lithium.com/t5/Community-API/bd-p/developers-rest-api?page=apicall)

Thanks in advance for your help.

Manasa