Xerox Travel Scanner 150 User Guide

							Xerox Travel Scanner 150
User’s Guide151 Color image brightness examples
The examples below show the original image at the default setting of 50% brightness level, 25% brightness and 
75% brightness. Adjusting the brightness level does not make the image completely black nor completely white.
Technical note:
Most monitors have a brightness setting that is user adjustable. When viewing scanned images on-screen, versus 
printing the image, the brightness setting of the monitor may affect how light or dark the scanned image looks 
when compared to the original. If the scanned image is too different from the original image, or if adjusting the 
scanned brightness level does not modify the image how you want, try adjusting the monitor's brightness level. 
Refer to the monitor's user guide for adjusting the brightness level and see if the manufacturer has any 
recommended settings.
Black background scanners:
Some scanners have a black background plate. A black background results in more precise cropping results and skew 
detection. However, when scanning thin paper, such as multipart color forms or ruled writing paper, which are less 
than 18lb paper weight, the background may “bleed” through into the final image and make the image darker than 
it should be. In that case, try adjusting the brightness level between 60% and 80%.
Contrast
Contrast refers to the differences between the light and dark portions in the image. Move the slider left or right to 
decrease or increase the contrast levels. Increasing the contrast level emphasizes the difference between the lighter 
and darker portions of the image, decreasing the contrast de-emphasizes that difference.
Choosing contrast values
While Brightness adds the same amount of gray or white to all pixels in the image, Contrast adjusts the pixels 
based on the pixel color level. For instance, increasing the contrast level will add white to light colored pixels and gray 
to dark pixels to make the difference between color levels in the image crisper. Decreasing the contrast level will 
have the opposite affect, where light colored pixels are modified with gray and dark pixels are modified with white 
to make the transition of colors in the image appear smoother.
Adjusting the contrast level is based on how you want the image to appear and there is no standard to adhere to. 
Contrast works in conjunction with brightness for image enhancement, when decreasing the brightness level, the 
overall image becomes darker, in which case you may want to increase the contrast level so that the differences 
between the lighter and darker portions of the image are clearer.
Below are some recommended options for contrast image correction based on the original document quality.
•Original documents of good quality - 50%
Brightness: 25%Brightness: 50%Brightness: 75% 
						

							Xerox Travel Scanner 150
User’s Guide 152 • Pencil written letters, forms, or drawings - 55% to 65%
• Faded pictures or old documents with faded text - 60% to 70%
• Light colored carbon copy paper, such as yellow or pale pink or pale green, with light text - 45% to 55%
•Newspaper or magazine pages - 55% to 70%
• Book pages - 60% to 75%
• Pictures taken inside or in the shade - 40% to 60%
Color image contrast examples
The examples below show the original image at the default setting of 50% contrast level, 25% contrast and 75% 
contrast.
Technical note:
Most monitors have a contrast setting that is user adjustable. When viewing scanned images on-screen, versus 
printing the image, the contrast setting of the monitor may affect how clear a scanned image looks when compared 
to the original. If the scanned image is too different from the original image, or if adjusting the scanned contrast 
level does not modify the image how you want, try adjusting the monitor's contrast level. Refer to the monitor's user 
guide for adjusting the contrast level and see if the manufacturer has any recommended settings.
Black background scanners:
Some scanners have a black background plate. A black background results in more precise cropping results and skew 
detection. However, when scanning thin paper, such as carbon copy paper or ruled writing paper, which are less than 
18lb paper weight, the background may “bleed” through into the final image and make the image darker than it 
should be. In that case, try adjusting the brightness level between 40% and 60%, then adjust the contrast level 
between 60% and 80%. 
Gamma
Gamma is the tone curve and starting point for image enhancement. Move the slider left or right to darken or 
lighten the image. As you raise or lower the Gamma value, the values at which Brightness and Contrast affect the 
image are changed. It is recommended that you keep the default gamma value, or adjust this setting before 
adjusting the other options. 
Choosing gamma values
As the gamma value is adjusted lower, the tone curve begins to straighten and the shadows of the image are 
expanded, darkening the shadows without overall darkening the image with gray as seen with lowering the 
brightness level. This way, the highlights and shadows in the image are maintained by saturating the pixels with 
darker levels of the same color rather than adding gray to all colors.
Contrast: 25%Contrast: 50%Contrast: 75% 
						

							Xerox Travel Scanner 150
User’s Guide153 As the gamma value is adjusted higher, the tone curve bends and the highlights of the image are expanded, 
lightening the highlights without overall lightening the image with white as seen with raising the brightness level. 
This way, the highlights and shadows in the image are maintained by saturating the pixels with lighter levels of the 
same color rather than just adding white.
Adjusting the gamma level is based on how you want the image to appear and there is no standard to adhere to.
Color image gamma examples
The examples below show the original image at the default setting of 1.8 gamma level, then 1.0 gamma and 2.6 
gamma. Adjusting the gamma level does not make the image completely black nor completely white.
Technical note:
Most monitors have a gamma setting that is user adjustable. When viewing scanned images on-screen, versus 
printing the image, the gamma setting of the monitor may affect how light or dark the scanned image looks when 
compared to the original. If the scanned image is too different from the original image, or if adjusting the scanned 
gamma level does not modify the image how you want, try adjusting the monitor's gamma level. Refer to the 
monitor's user guide for adjusting the gamma level and see if the manufacturer has any recommended settings.
Invert Image
The Invert image option reverses the color of each pixel in the scanned image. 
When scanning in black and white, each pixel is reversed from black to white and white to black. When scanning in 
grayscale each pixel is reversed to the opposite level of gray. When scanning in color each pixel is reversed to the 
opposite color in the color wheel.
For example, you might choose this option if you are scanning pages that have been printed from newspaper 
microfilm. Newspaper microfilm reverses black and white so that when viewed on a monitor, the text is white and 
the paper is black.
Gamma: 1.0Gamma: 1.8Gamma: 2.6 
						

							Xerox Travel Scanner 150
User’s Guide 154 The following example shows the original grayscale image and the inverted image.
The following example shows the original color image and the inverted image. 
Mirror Image
The Mirror image option flips the image left-to-right.
Bit Depth Reduction
The Bit depth reduction options are only available when scanning in black and white. Click the drop down menu 
and select an option from the list. 
						

							Xerox Travel Scanner 150
User’s Guide155 Threshold and Dynamic threshold
Threshold enables you to set what level of light or dark to look for on a page. When scanning in black and white, 
everything on the page is set to either white pixels or black pixels in the final image. If the text on the page is a light 
color, then the text may be gone in the final image as the scanner will change those light colors to white pixels. The 
threshold slider lets you set the level of darkness or lightness of the text on the page. Dynamic threshold attempts 
to evaluate the image and dynamically adjust the threshold level. These options work best for documents that 
contain only text such as business letters, spreadsheets, reports, etc...
•Threshold—move the slider to the left or right to set the level of lightness or darkness for the scanner to 
leverage from. 
For example, if you are scanning a document with gray text, such as hand written pencil notes, move the slider 
to the right. This tells the scanner that the level to look for is light, and gray pixels are converted to black pixels 
instead of white. If the overall tone of the original document is dark, such as a colored background that may 
interfere with detecting black, move the slider left. This tells the scanner that the level to look for is dark, only 
very dark areas such as text are converted to black pixels.
If you are scanning documents that are in good condition, with black text on a white background, the default 
threshold option will properly scan the item. This level only needs to be adjusted if the scanned image does not 
have image clarity similar to the original.
•Sensitivity—move the slider left or right to adjust the sensitivity level for dynamic thresholding. This slider is 
only enabled when Dynamic threshold is selected in the list.
Error diffusion, Bayer, and Halftone pattern
Error diffusion, Bayer, and Halftone patterns are the intentional application of noise (dithering) in the image to 
help alleviate banding when scanning in binary (black and white) mode. For example, if you scan a color photo in 
black and white, the image file will have large blocks of black and white and the image barely recognizable. 
Dithering the image creates a black and white image that is recognizable. 
Below is an example of a color scan, a black and white scan without dithering, and a black and white scan with 
dithering. When the image is scaled down, it may look like a grayscale scan. When the image is at normal size or 
enlarged you will be able to clearly see the dithering pattern, as shown in the close-up image.
Color scanBlack and White scan Bayer dither scan 
						

							Xerox Travel Scanner 150
User’s Guide 156 Bayer dither scan - Close up
Advanced Panel Options
The options in this panel may also appear in the Main panel, but with additional settings for you to fine-tune the 
feature you've selected.
Despeckle
This option removes speckles from the background. Speckles are small spots on an image that the scanner 
interpreted as a valid part of the document. For example, an irregularity in the paper, a small wrinkle, or holes where 
a staple was removed may show up as speckles in the scanned image. The Despeckle option identifies these spots 
and removes them. This option is only available when scanning in black and white. 
Radius—this is the size of the area that is evaluated for stray dots. 
Number—this is the maximum number of dots within the radius that should be considered a speckle. If this number 
of dots are in the circle, the dots will not be considered a speckle and remain in the image. If there are less than this 
number of dots in the circle, the dots are considered a speckle and removed from the image. 
						

							Xerox Travel Scanner 150
User’s Guide157 For example, if the radius is 3 and the number is 5, then the document is evaluated in sections of 3x3 pixels and if 
there are more than 5 stray dots within a 3x3 area, they are not considered a speckle.
Filter
Use the Filter option to increase or decrease the sharpness in the scanned image. Click the drop down menu and 
select an option from the list. Use the Mask slider to adjust the tolerance level of the filter.
Color Management
Select this option to use the scanner’s default Gamma table which has been calibrated to produce the best quality 
results for your scanner. When this option is not selected, you may need to manually adjust the Gamma, Brightness 
and Contrast settings. Please refer to the sections describing Gamma, Brightness and Contrast fo r  m o re  in fo r m a t i o n  
about the features and how to adjust the settings.
Moiré Reduction
Moiré patterns are wavy or rippled lines that may appear in the scanned images of newspapers and magazines, and 
sometimes scanned images of photos, line drawings, and color scans of textured paper. Select the Moiré reduction 
option to have the driver attempt to find and remove moiré patterns from the image. Please note that when Moiré 
reduction is enabled the scanner may scan slower as the image is checked for moiré patterns. This option is only 
available when scanning in Color or Gray.
Moiré radius—you can set the size of the area to be evaluated in the Moiré radius field. Adjusting the radius will 
produce different results for the various types of items that can be scanned. With this feature, you may have to test 
scan a few times, adjusting the Moiré radius as needed, until you obtain the best results for the type of paper in 
your scan job. Note that the higher the number is in the Moiré radius field, the longer it will take the driver to 
evaluate the image.
Color Dropout
Color dropout tells the scanner and software to remove a specific color from the image. You can choose either Red, 
Green, or Blue, or define a custom color, to be dropped out of an image. Image with moiré patterns Image with moiré patterns 
removed 
						

							Xerox Travel Scanner 150
User’s Guide 158 To input a custom color using its RGB value, select Custom in this list and then input the values for R, G, and B in 
their appropriate boxes, where R, G, and B are numbers from 0 to 255. 
To l e r a n c e—use the slider to adjust the precision of the color dropout. 
•More precise—this option removes a range of colors closest to the pure color selected or defined in the 
custom fields. For example, pure red has an R/G/B value of 255/0/0. Selecting Red indicates that the scanner 
should look for a range of RGB reds close to pure red and remove them from the image. 
•More approximate—this option removes a wider range of colors based on the pure color selected in the list or 
defined in the custom fields.
This option is only available when scanning in grayscale or black and white. The example below shows the original 
text with a red watermark and the resulting image with the color removed. 
						

							Xerox Travel Scanner 150
User’s Guide159
Driver Configuration
Use the Driver configuration section to configure the add-on modules, select interface options, and view the 
scanner hardware properties. When the Advanced configuration mode is selected, a scanner panel option will be 
available for you to change any hardware settings that may be available for your scanner.
Disabled Options in this Section
Some options in the interface may be grayed out and cannot be selected. Grayed out options are either not 
appropriate for the current scanner, the software needed to enable the feature is not installed, or the feature is 
dependent on another setting in the scanner's interface. Hover the mouse cursor over a grayed out feature to see 
information about why the feature is unavailable.
Module Configuration
When image processing modules are installed they will appear in the list on the Configure tab. Use this tab to 
enable the modules you want to use when scanning.  
						

							Xerox Travel Scanner 150
User’s Guide 160 There are some features in the scanner interface that are disabled until a module is installed that contains those 
options. When the module is installed, the features will enable in the scanner interface for you to use them. 
Reordering the Modules
Select a module in the list and click the up or down arrow to change the order of the module in the list. Changing the 
order of the modules changes the order in which the image processing options are used. For example, if there are 
two modules installed and both modules include an automatic image rotation option, the first module's rotate 
option is used and the rotate setting in the second module is ignored so that the image is not rotated twice.
Hardware Settings
The scanner configuration tab shows the hardware information for your scanner.
Paper Pickup Options
The Paper pickup options allow you to choose how the scanner responds when a page is inserted into the scanner.
•Delay—this is the amount of time between when the paper sensor is engaged and the rollers start to feed the 
page into the scanner. When the TWAIN interface is open, or when automatic scanning is disabled, the page is 
pre-fed and then the scanner waits until you click Scan in the interface before it will continue to feed and scan 
the page. When automatic scanning is enabled and the TWAIN interface is closed, the scanner will 
automatically feed and scan the page using the settings in OneTouch. 
Increasing the delay time allows you to make sure the page is in straight before the scanner starts to feed it 
through.  If the delay time is 0 ms (milliseconds), the scanner starts as soon as the paper sensor detects that a 
page has been inserted. You can set the delay time between 0 milliseconds (no delay) and 1250 milliseconds 
(1.25 seconds).
Note that automatic scanning is only available when OneTouch is installed. Please refer to the Application 
Settings section for instructions to enable or disable automatic scanning.
•Insertion depth—this is how far into the scanner the page is pre-fed after the paper sensor has been 
engaged.
Skew Detection
By default, the scanner is set to detect when the item being scanned is at an angle, also called skewed. It will stop 
scanning and back the item out of the scanner. Click on Enable the detection of excessive document skew. Back 
out the document if this occurs.