Increase all image sizes in epub for Glowlight 4?

[bwaslo]

Hope this isn't a dumb question. When I look at epub files on the Glowight 4 ebook, inline images are often extremely small, almost flyspecks. For instance, math equations show very small. Viewed in the Calibre viewer, they look fine, but on the Glowlight 4 they are virtually unreadable and unviewable. I was wondering if there is some way in Calibre to make them all like maybe 4x or 8x larger?

They also tend to be less bold than the text (though at first on the page, they are darker, then go dim). I'm guessing this might be because the Glowlight is detected as a Nook Color, so it's doing a greyscale (?).

I'd really like to be able to read some technical books with math formulae on the Nook, but it's very tedious (and enlarging the images by double-tapping is very slow and very hit-and-miss).

Thanks

[Karellen]

You would have to open the epub in the Calibre Editor. Then check the images themselves.
You might find they are extremely small, not really suited for purpose.
If they seem ok, then the CSS code for images needs to be tweaked.