a good control of the resolution results a satisfactory detail of an image that scans. the resolution is measured by dots per inch(dpi). normally, the greater the dpi number, the higher the resolution and the image file size. be aware that the greater resolution takes more time, memory and disk space, therefore, up to a certain degree of dpi, the resolution will not visually be improved, on the contrary, it makes your files more unmanageable.

   

    figure 4-5 resolution control

    scaling: you can lock the x-y scaling factor to keep the ratio of the axis. or you can use a different scaling factor for each axis.

    unit: a reminder of the measure system in use. by clicking on the abbreviation you can change the measure system.