There have been many discussions about the dpi. Once you reduce the image to show it on the web I always wondered how much difference it made, since it's not like printing where DPI matters. The scanner does make a difference but more because it can have a better color depth and the native resolution of the scanner also matters. A 300 dpi scanner making 1200 dpi images, isn't going to look like this.

Once you make an image 500 pixels wide, which many are for this website and eBay, or even if you go large, it's not really that different.

The 300 dpi image started out roughly 700 x 700, while the 2400 dpi image was 5600 x 5600. Making both of those 500 wide they look pretty much identical, and so do the two sizes in between. No color correction or enhancement because I didn't want to alter the actual scans in any way other than size. Each image is still saved at the same dpi as it was originally scanned.

Each chip image was scanned on the same scanner at 300, 600, 1200 and 2400 dpi, then all the images were reduced to 500 pixels wide and pasted into one image so they could all be close to each other for comparison.

Can you tell which was 300 dpi and which was 2400 dpi? Can you tell any of them from each other?

If you are posting images that are the same size or smaller than the original, they will all appear the same on the web.

What I'm getting at, is the model and make of the scanner makes more difference than the dpi.

These were done with an Epson V200, now V300 under $100 scanner.