Canon CanoScan D646U User Manual

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Canon CanoScan D646U User Manual Manual pdf 19 page image

19S T E P 1Setting the Resolution and MagnificationThe magnification of an image can be changed before scanning to accommodatereproductions that are larger or smaller than the original. The settings can bechanged in increments of 1%.Changing the magnification setting causes the resolution display on the controlpanel to change correspondingly. This resolution setting is referred to as the“scanning resolution.”Output Device Resolution= 720 dpi, Magnification= 100%Scanning at 200%Scanning at 50%12"/30cm3"/7.5cm2"/5cm6"/15cm4"/10cm8"/20cmScanning with horizontal/vertical 2x magnificationScanning with horizontal/vertical 0.5x magnificationThe scanning resolution changesaccordingly.Magnificationchanged to50%MagnificationScanning Resolution➟➟Magnification50% Scanned at360 dpiImage size = 5"x5"(12.7 x 12.7cm)Image size = 2.5"x2.5"(6.35 x 6.35cm)Output devicecorrects to720 dpiHintMagnification and ResolutionWhy does the image size change with the magnification? Let us answer thiswith an example using a “BJ (720 dpi)” output device. If you were to scanan image with this device setting and set the magnification factor to 50%,the scanning resolution will automatically change to 360 dpi. At thissetting, the image will be scanned at a resolution of 360 dpi and the outputdevice will convert this to 720 dpi, shrinking the size of the output in theprocess because it will only have half the data with which to fill the space.