I’m coming from Feedly and I’ve noticed that some feeds in NewsBlur (reddit for example) have very small images in the feed: 128x128 pixels. While an example reddit image from Feedly has this:
Feedly: 1,200px × 800px (scaled to 580px × 387px)
It doesn’t look like Feedly is upscaling the image. They must be pulling it from the linked article.