Xerox XEScan Solution User Guide

 

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You have the option to set the black and white points for each single color. To do this, click on each color in the 
color selection menu separately and drag the white point with the right mouse button to the value where the peak 
of the respective color in the histogram is most pronounced. The activated color is displayed in the color field (box 
above the RGB menu fields). This way you can set the white point for all three primary colors as well as for mixed 
colors. The black point for contrast enhancement can also be determined individually for each color. However, we 
recommend setting the black point to the same value for each color. 
 
Color Pickers for Black and White Points 

You may also adjust the contrast with the color pickers for the black (left to the histogram) and the white points 
(right to the histogram). Click on the color picker for the black point and select a black area in the image by 
drawing a box around the area you want to define as the black or white point, keeping the mouse button pressed. 
The averaged color value of the selected area will be assigned to the black point, and automatically corrected.  
 
Proceed likewise for the white point choosing a white area in the image. 

 

 

 
Under Method you can choose between Color preservation and Contrast enhancement. The background 
correction is strongly dependent on the black and white points and the sort of the original that has been scanned. 

Contrast enhancement is suited for printed originals, photos and imported graphic files (RIP) with low black and 
white point corrections. 

Color preservation is recommended for technical drawings, maps or mixed originals with strong black and white 
point corrections. 
 
 

 
When performing a gamma correction, both the white and black points remain constant. Only the brightness, or 
color intensity, of the values between the points will be enhanced or lowered. When setting the gamma values 
you can choose between the color models RGB (red, green, blue) or CMY (cyan, magenta, yellow). 
 
Usually, all three color values are changed simultaneously. If you want to change each color value separately, 
deactivate the check box to the right of the RGB or CMY values. The gamma value is set to a standard of 1.000 
for all colors. With the Reset button all changes that have been done are cancelled and the values are set back to 
their original values. 
 

 

 
 

 
With difficult originals we recommend working with special filters in order to achieve an optimal print quality. You 
may choose from Soften, Sharpen and Descreen. If you do not want to use a special filter, choose None from the 
combo box. 
 
Descreen 

Descreen combines the advantages of the two filters Soften and Sharpen. Therefore, these filters are best suited 
for rastered originals. Depending on the raster of the original either the special filter Descreen 1 or Descreen 2 
can be more effective. 
 
Soften 

With the help of this filter the image sharpness is reduced by smoothing the color transitions of clearly defined 
image lines and shaded areas. The functions Soften and Soften More are excellent for photos and only differ in 
the intensity of their effect.