24-Bit Color; Selecting The Proper Resolution - Konica Minolta PagePro 1390 MF User Manual

With 8 bits of color information per pixel, the file size of an image is eight
times larger than that of a black-and-white image and 1/3 the size of a 24-bit
color image.

24-Bit Color

A 24-bit color image consists of three 8-bit color channels. The red, green,
and blue channels are mixed together to create a combination of one billion
colors, which give a more true-to-life quality to the image. Choose "24-Bit
Color" for scanning color photos.

Selecting the Proper Resolution

Good control of the resolution results in satisfactory details in the scanned
image. The resolution is measured in dots per inch (dpi). Typically, the greater
the dpi, the higher the resolution and image file size.
Be aware that a greater resolution requires more time, memory, and disk
space. Note that above a certain dpi, the resolution does not visually improve
the image, but only makes your file larger.
For your information, an A4-or Letter-sized color image scanned at
300 dpi in True Color mode consumes approximately 25 MB of disk
space. A higher resolution (over 600 dpi) is recommended only when
you need to scan a small area in True Color mode.
Refer to the following table to choose the proper resolution for your
image, depending on the application.
Scanner Setting Applica-
tion
Filing, faxing, e-mailing
a document
Viewing, copying, editing
a color picture
OCRing* a document
* Optical Character Recognition: the process of converting an image to text
40
Image Type
Black and White
24-Bit Color
Black and White
Resolution (dpi)
200
150
300
TWAIN Driver Settings