Reply below posted in response to the same question in the DW forum:

Image resolution (or dpi) only matters when printing.

It has no effect on viewing images on screen.

http://www.leannehoad.com.au/temp/dpi_test.htm
http://www.emdpi.com/imagedpi.html

What matters on the web is image dimensions (height x width measured in
pixels) and compression because for a given image you're balancing filesize
vs perceived quality.

>Would it be better to increase the
> size of this? What would the benefits or problems that I would encounter
> if I
> were to make this 100 pixels/inch or higher?

Ignore it. Refer above.

--
Regards

John Waller