The best resolution at which to capture your images will be dependent on the size of the image you are capturing. Image (or spatial) resolution relates to the number of pixels displayed per unit length of a digital image and is often measured in dpi (dots per inch) or in microns (the size of the area each pixel represents). Images with a higher spatial resolution have a greater number of pixels and have more image detail than that those of lower spatial resolution.
Try to scan at the best resolution for your images. In most situations, 300 dpi or 100 microns will provide an image that is large enough for accurate analysis and small enough for efficient processing.
For more information, download our image capture guide: http://totallab.com/cms/pdf/imagecaptureebook.pdf