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I'm sure DaleDe was using "pixels" in reference to the width and height of the finished image, which is more important for spacing in epubs than dpi.
Such as a small logo often found in the published dates page can be as small as 40x40 pixels. I recently scanned an old book with 2 signatures included, one just an initial, and one the entire name, and they were 54x40 pixels and 253x40 pixels. A larger logo for the book was 150x110.
There's a never a set size you can predetermine while scanning to know what size will look best once you get the words around it in the ebook. Which is why I always scan in the highest res or dpi possible. That way I have a good clean image to play around with while I determine the proper size for the image and I never have to go back and rescan it again. And the only way to determine that is to try a size, put it in the ebook, load it in your reader and check it. What might look great on your PC in Calibre's viewer might look way too big on your reader. There's a lot of resizing usually to get it right.
It's all about the spacing, which is the number of pixels for width and height, once it gets into the ebook itself. Dpi doesn't matter at all in the end result.
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