ScanShell ScanShell 800N Manuel d'utilisateur télécharger pdf (Page 35)

Program Configuration – Image Tab 35

256 shades of gray: 8-bit gray image

Black and white: 1-bit image

As mentioned above, more colors mean larger image file size. The relation between color

scheme and file size can be defined approximated as follows:

File size = 2

number of bits

Accordingly, if a certain document scanned in black and white format produces a file of

50KB, the same document produces an image file of 400KB when scanned in 256 colors

(or gray scale), and 1.2 MB for true color.

Resolution: The resolution parameter defines how vividly the image will be displayed. In

general, an image that is scanned in higher resolution shows more details of the original

document image. However, as with the color scheme – higher resolution means larger

image file size. idScan supports scanning resolutions in the range of 50 dpi to 600 dpi, in

increments of 10 dpi.

idScan calculates the approximate file size for bitmap format based on the current

document size, color scheme and resolution. The result is displayed under ‘Image

dimensions and size’.

JPEG Quality: Sets the image quality when saving in JPEG format. This value range can

be between 11 and 100. 100 represents the best image quality, but would also result in the

biggest file size.

TEXT STAMP

The text stamp window allows you to add an automatic text stamp to the scanned image.

This window lets you insert a text string and control various text parameters.

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ScanShell ScanShell 800N Manuel d'utilisateur Page 35