thecoalman - 10:12 pm on Apr 11, 2013 (gmt 0)
Everything has to rasterize (bitmap) to 72 DPI for browser rendering anyway (unless you plan in using some vector rendering which requires a plug in.)
Am I missing something here? An image in a web browser is displayed at it's pixel dimensions unless otherwise specified such as a percentage of the parent element, e.g. by default one image pixel occupies one pixel of monitor space. To the best of my knowledge DPI is irrelevant where the rendering of a web page is concerned.
A 200px*200px image that is 72DPI is going to take up the same exact amount of space as 200px*200px image that is 300dpi. In fact these files will be exactly identical other than the DPI setting that is only going to be effective on a canvas that supports it like a Word document.