Xerox Documate 4700 User Guide
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Xerox® DocuMate® 4700 User’s Guide151 Main Panel Options Some of the options in this panel may have advanced adjustment options on a different panel in this section. When the Advanced configuration mode is selected, an icon will appear next to those features which have adjustment options on another tab. Click on one of the icons to go to the area of the interface where the adjustment options are located. Click on a link below to go to the appropriate page in this section for instructions on adjusting the option that is displayed on the Main tab. See Advanced Panel Options on page 159 •Despeckle Brightness Brightness is the overall lightness of the image. Move the slider left or right to darken or lighten the image. Adjusting the brightness level adjusts the tone of the pixels, without changing the true color of the pixels; such as when adjusting hue. Choosing brightness values Adjusting the brightness level is based on how you want the image to appear and there is no standard to adhere to. Below are some recommended options for brightness image correction based on the original document quality. •Original documents of good quality - 50% • Pencil written letters, forms, or drawings - 25% to 40% • Faded pictures or old documents with faded text - 35% to 45% • 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 - 55% to 80% • Pictures taken inside or in the shade - 60% to 85% Brightness works in conjunction with Contrast for image enhancement. When you are adjusting the brightness level to improve the scanned image quality, try adjusting the contrast level as well. The contrast level is the range between the lightest and darkest parts of the image. For example, if you scanned a document with notes written in pencil, you may have to decrease the brightness level to get the handwritten notes to appear in the scanned image. However, when decreasing the brightness, white starts to appear gray in the image. In that case, raise the contrast level to make the differences between the lightest and darkest part of the image more defined.
Xerox® DocuMate® 4700 User’s Guide 152 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® DocuMate® 4700 User’s Guide153 • 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® DocuMate® 4700 User’s Guide 154 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® DocuMate® 4700 User’s Guide155 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® DocuMate® 4700 User’s Guide 156 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® DocuMate® 4700 User’s Guide157 Bayer dither scan - Close up Fill Margin Holes Select this option if you are scanning pages with punched holes in the margins. This option will fill these holes with the detected background color in the final scan. The scanner will detect and fill the holes under the following conditions: • The size of the hole can be between approximately 4 mm and 12 mm • The maximum width of the margin is 25.4 mm from the edge of the paper • The size of the margin is 24.4 mm • The position of the hole cannot be flush to the edge of the margin area and it cannot overlap the edge of the margin area
Xerox® DocuMate® 4700 User’s Guide 158 Color Processing Panel Options The options in this panel are for setting how the scanner should process colors in specific color modes. 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. 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® DocuMate® 4700 User’s Guide159 Perform Color Correction Apply color correction to the image so the displayed colors approximate the original item colors. Select this option to use the scanner’s default Gamma table which has been calibrated to produce the best quality color results for your scanner. When this option is not selected, the resulting scans will be dark and the brightness, contrast, and gamma options will require a greater amount of adjustment to affect the overall lightness of the image. 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. 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.
Xerox® DocuMate® 4700 User’s Guide 160 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. 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. White Level With this option you can set what the scanner should interpret as “white” in the final image, even though the page being scanned may have a shaded or off-white background. You may want to adjust this option to have the image automatically corrected when you are scanning irregular paper, such as thick or thin paper, that may cause the white page in the final image to appear shaded with a pale grey. This option is only available when scanning in Color or Gray. For the best automatic results you can simply select the type of paper you are scanning from the list. Alternatively, you can input a number in the Custom value field. The value you set in this field can be from 128 to 255. If you set the custom value to 128 you are telling the scanner that all pixels that are grey level 128 or higher (lighter) should be changed to white in the final image. If you set the custom value to 255, you are telling the scanner that only pure white is white and anything lower than 255 should remain unchanged in the final image. Image with moiré patterns Image with moiré patterns removed