title_body: Downscaled screenshots of HTML tables look blurry. Why? My EPUB contained many HTML tables, many of which would break on small screens. I therefore took screenshots of the tables and inserted the images into the EPUB in place of the HTML tables.
  
  I just viewed my EPUB on Adobe Digital Editions (ADE) for PC. The table images look terrible! The text in the images is illegible.
  
  The images become blurry only when ADE downscales them. If I expand the window and force ADE to upscale the images, they look better. At full size, they look crisp.
  
  I have been looking for an answer to this problem ALL day. The best one so far is to create new images of the tables, this time using very bold text and thick lines. This works quite well. Most of the images become legible; however, they look very ugly, and some still look quite terrible.
  
  Does anyone know how I can fix this issue?
upvoted_answer: I don't think that you can really "fix" this; representing text with a raster image and downscaling it means that it will be displayed with far less pixels that are required to provide a clean and readable image.  
  
  You can try by using an image format that is better suited for this task; I would suggest .png (avoid .jpg like the plague in these circumstances!), it can help but honestly I won't expect miracles if the text is going to be downscaled a lot.
  
  Long story short: don't use images to display text.