Resolution and Size

Resolution and Image Size

Resolution
Resolution determines the level of details recorded by a scanner.
Image quality will be improved with higher resolution. However, beyond a certain point called "optical resolution", you will see no visible improvement in the image even increasing the resolution greatly.

The difference of optical resolution from maximum resolution:

Optical resolution is the intrinsic resolution of a scanner, determined by the optics of the scanner hardware (e.g., a scanner with 300 x 600 dpi, 300 dpi is the x-coordination resolution determined by the CCD (charge-coupled device), and 600 dpi is the y-coordination resolution determined by the motor's steps per second).
Maximum resolution is the resolution enhanced through an interpolation algorithm. Interpolated resolution is useful in scanning line art or enlarging small originals. However, maximum resolution is inferior to optical resolution in some image quality and crispness aspects.

Image Size
A large image size will lower the system performance of your computer dramatically. The file size is affected by the selected area, file format, scaling ratio, resolution and the image type. The following table presents the detail information(file compression is excluded):

Image Type	Description	Image Size (Bytes)
1-bit images	Black and White Line Art	(Height x Width x Height resolution x Width resolution) x (Scaling percentages) 2 /8
8-bits images	Black and White or Color Image, 256 gray levels or 256 colors	(Height x Width x Height resolution x Width resolution) x (Scaling Percentages) 2 x 8 ) /8
24-bits images	Color Image, Millions of Colors	((Height x Width x Height resolution x Width resolution) x (Scaling Percentages) 2 x 24 ) /8
36-bits images	Color Image, Billions of Colors	((Height x Width x Height resolution x Width resolution) x (Scaling Percentages) 2 x 36 ) /8