Our systems receive your full-size images and store them exactly as received.
In the labeling/sorting page and the confirmation page, we show only low-res thumbnail images. We do this because we want to confirm that you uploaded the images you intended, and to let you label your work with the relevant information (title, year, etc). And it's a lot faster.
The open call curators can view your full-size images in their full resolution.
Check out this brief video that explains how to sign up.