Xerox DocuMate 152i Scanning Manual

Also see for DocuMate 3120: User guide

Xerox DocuMate 152i Scanning Manual Manual pdf 41 page image

Image Enhancements TWAIN Scanning GuideUser’s Guide 37ContrastContrast refers to the differences between the light and dark portions in the image. Move theslider left or right to decrease or increase the contrast levels. Increasing the contrast levelemphasizes the difference between the lighter and darker portions of the image, decreasing thecontrast de-emphasizes that difference.Choosing contrast valuesWhile Brightness adds the same amount of gray or white to all pixels in the image, Contrastadjusts the pixels based on the pixel color level. For instance, increasing the contrast level will addwhite to light colored pixels and gray to dark pixels to make the difference between color levels inthe image crisper. Decreasing the contrast level will have the opposite effect, where light coloredpixels are modified with gray and dark pixels are modified with white to make the transition ofcolors in the image appear smoother.Adjusting the contrast level is based on how you want the image to appear and there is nostandard 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 maywant to increase the contrast level so that the differences between the lighter and darker portionsof the image are clearer.Below are some recommended options for contrast image correction based on the originaldocument quality.• Original documents of good quality - 50%• 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 examplesThe examples below show the original image at the default setting of 50% contrast level, 25%contrast and 75% contrast.Contrast: 25% Contrast: 50% Contrast: 75%