If your images are too huge for your purpose, then you might be scanning at an excessively high resolution. Try scanning at a lower resolution value, an appropriate value for the goal. You should not scan at 2400 dpi just because your scanner can do it, the same idea as not driving to the grocery store at 120 MPH just because your car can do it. There are rules. Instead just use the basic principles to properly scan to create the size of image that you actually need and want. Or, another choice is that you can resample a too-large existing image to be smaller, to have smaller dimensions in pixels.

If you want to print the image to be 6×4 inches at 300 dpi on paper, then the requirements for the image are:

(6 inches x 300 dpi) x (4 inches x 300 dpi) = 1800×1200 pixels.

This image is larger than most video screens. Printing typically requires a larger image (more pixels) than does the video screen.

A shortcut:    If you want to enlarge the printed copy, the ratio of (scanning resolution / printing resolution) is the enlargement factor.   For example:

-Scan at 600 dpi, print at 300 dpi, for 600/300 = 2X size (double size or 200% size)

-Scan at 300 dpi, print at 300 dpi, for 300/300 = 1X size (original size or 100% size)

-Scan at 150 dpi, print at 300 dpi, for 150/300 = 1/2X size (half size or 50% size)


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