Hardware Options EPSON

Every scanner offers some hardware features, which can be accessed via this panel. Of course this panel may be different with different scanners. But this one is which we use for all EPSON scanners. Depending on the selected color depth some of the features may be disabled.
Brightness
Brightness indeed acts like a brightness adjustment. Positive values result in a brighter image, negative values lead to a darker image.
 
Sharpness
Adjusts the sharpness of scanned. Positive values result in a sharper image, negative values lead to a more defocused image.
 
Gamma
The gamma correction refers to the gamma correction table stored in the scanners internal memory, and adjusts the conversion ratio between the input intensity of the original image and the output image data values. The various predefined settings have the following characteristics :

Bi-level display
This setting is suitable for CRT display types that are incapable of displaying different tones of gray or colors. For example, this setting is suitable for displays that can produce only 8 or 16 colors.

Multilevel display
This setting is suitable for high performance CRT display types that can display different tones of gray or colors. For example, this setting is suitable for displays that can show more than16 colors.

High density printers
This setting is appropriate for printing on high density printers, such as 24-dot printers and laser printers. Since high density printing increases the darker components of the image, this setting compensates by producing data that is lighter than that used by a CRT display.

Low density printers
This mode is suitable for low density printing on 8 dot (9 pin) printers. This mode is similar to the Printer Output A mode, but the conversion curve is slightly different to compensate for the different printer characteristics. This mode is also suitable for printing on printers that produce finer dots, such as high-resolution laser printers and ink jet printers.

High contrast printers
This setting is suitable for images that require more clarity and distinction, such as mixtures of text and graphics. It is also suitable for printing on laser printers that can produce more distinct images than impact dot matrix printers.

 
Halftoning mode
Sets the halftoning process modes for bi-level dither data. Each halftoning mode has the following characteristics :

Halftoning hard tone
The image is processed to produce hard tones, to express distinction. This mode is suitable for most purposes.

Halftoning soft tone
The image is processed to give soft tones. This mode is suitable for images that contain large areas of similar tones.

Halftoning net-screen
The image is processed so that it is represented similar to the net screen used in newspaper printing. The gradations of the tones are represented by clusters of different numbers of dots.

Dither modes
Different named dither modes. This modes are only available for newer scanner models.

 
Color Correction
Sets the color correction to suit the selected type of color output device. You may only use this option when selecting the 'one pass scan' - switch. This option is only enabled in connection with the Color mode.
 
Transparency Adapter
This option is only available, when a supported transparency adapter was found. Switching between those modes resets the selection rectangle. Be aware that also the rulers and object positions may change.
Normal
Transparency
Turns backlight off.
Turns backlight on.

Note: These features enhance or manipulate image data before they are transferred into the computer system. Therefore there is no way to revert this conversions, than to repeat the scan with different values. This may be faster than a software operation on images.


See also