On all impression requests, Sharethrough will request two images:
For desktop bid requests, the small mobile thumbnail image (#1) is optional. For mobile web and app bid requests, the large desktop thumbnail image (#2) is optional. In either scenario, we highly recommend providing both images to maximize thumbnail resolution and prevent the image from getting cropped.
Assuming an image is provided in one of the above aspect ratios (1:1, 4:3, or 16:9), the thumbnail will render as follows:
In the 20% of impressions outside of a 2:1 aspect ratio, the thumbnail will be cropped to fit the publisher’s designed integration. In those rare instances, Sharethrough applies image cropping technology to locate the center of the image and crop the image around that center point to the placement’s specified dimensions.
To maximize your campaign’s engagement, follow the below best practices for thumbnail images: