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One thing to note when comparing a book on a high-pixel-density device with the same book on a PC, is that the PC viewing window is likely to be lower resolution. E.g. when I open a book in Calibre the viewer window is 800x600.
The fundemental problem with the way many publishers display images in their ebooks is that they are sized for a low-resolution device, usually 800x600. They might look fine in Calibre, or in the Kobo app on a PC, or on an old Kobo Touch, but the images will be too small for a high-dpi device like a H2O or GloHD.
There are ways to make the images resize automatically, but it is never going to look good on a H2O or GloHD if the resolution of the underlying bitmap was created to suit an 800x600 device. The only real solution is for publishers to either use much much higher resolution bitmaps, or to create proper scalable vector graphics images (or simply to embed fonts if the images are of text). There is just nothing the device or firmware can do to make the images both look clear and display at the right size if the publisher has only provided low-resolution bitmaps.
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