Konica Minolta pagepro 1390MF pagepro 1390MF User Manual English - Page 52

-Bit Gray, 24-Bit Color, Selecting the Proper Resolution

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* A combination of the words "picture" and "element," a pixel is a single dot on a computer display or in a digital image. 8-Bit Gray A single-channel image consists of at least 256 shades of gray. An 8-bit scanner produces a grayscale image with 1,024 shades of gray between pure black and pure white. Choose this option for scanning black-and-white photographs. 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. 40 TWAIN Driver Settings

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TWAIN Driver Settings
40
* A combination of the words “picture” and “element,” a pixel is a single dot on
a computer display or in a digital image.
8-Bit Gray
A single-channel image consists of at least 256 shades of gray. An 8-bit scan-
ner produces a grayscale image with 1,024 shades of gray between pure
black and pure white. Choose this option for scanning black-and-white photo-
graphs.
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.