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The Scan Manager presents you with a selection of filters that affect the quality of the scanned page. These filters can make a significant difference in how well your scanned page looks.
The filter selection stays the same until you change it.
The default filter (a good balance between speed and quality) is Linear.
The filter options are:
Details about the image filters are:
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Nearest - The fastest filter, but the quality of the stretched image is only fair
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Linear - Several times slower than Linear, but it produces more decent results in most cases.
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Spline - An approximation of spline interpolation, for some applications its result may be too smooth and blurry, but when using with large magnification factors, it usually produces good results.
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Lanczos - Generally produces the sharpest image, however sometimes can produce excessive "ringing" effect - this is the slowest filter
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Mitchell - Is often considered as one of the best filters for enlarging images; generally not as sharp as Lanczos.
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Draft - A complex resampler, meaning that it uses several different methods. For downsampling it uses row-column zoneshifting to preserve more details than Nearest, however the quality is not as good as Linear. For upsampling it uses a linear interpolation method that may compromise details - this happens if both downsampling and upsampling is needed. Draft is ideal for preview fields and thumbnails.
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Cosine - Almost equally fast as Linear, but it uses cosine interpolation, which produces a sharper image.
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