Bounding boxes drawn on images sometimes result in unreadable text in .explore()

[znation]

Repro steps:

1. Load some large (4k+) images, with bounding box annotations, into an SFrame
2. Draw bounding boxes on the images using object_detector.util.draw_bounding_boxes
3. Call .explore on the SFrame with images with drawn bounding boxes

Expected: the bounding boxes look crisp, and the text (label and confidence) is readable
Actual: the bounding boxes look fuzzy, and the text is unreadable, due to image scaling to produce the thumbnail and resized hover image in the explore view.