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1 - 10 Document Reader Imaging Guide
IS - Unsharp/Brighten Filter
The Unsharp/Brighten Filter automatically sharpens the text and brightens the contrast of the image, making text more
readable. This is similar to the Image Adaptive Text Filter, however it brightens the image as well. You should test both
image processing techniques to determine which filter works best for your environment.
Note: The Unsharp/Brighten Filter should not be used concurrently with the IU - Image Adaptive Text Filter.
0is Unsharp/Brighten Filter off (default)
1is Unsharp/Brighten Filter on
J - JPEG Image Quality
Sets the desired quality when the JPEG image format is selected. Higher numbers result in higher quality, but larger files.
Smaller numbers result in greater amounts of lossy compression, faster transmission times, lower quality, but smaller files.
(Default = 50)
nJ Image is compressed as much as possible while preserving quality factor of n (n = 0 - 100)
0J worst quality (smallest file)
100J best quality (largest file)
K - Gamma Correction
Gamma measures the brightness of midtone values produced by the image. You can brighten or darken an image using
gamma correction. A higher gamma correction yields an overall brighter image. The lower the setting, the darker the image.
The optimal setting for text images is 50K.
0K Gamma correction off (default)
50K Apply gamma correction for brightening typical document image
nK Apply gamma correction factor n (n = 0-1,000)
Example of Unsharp/Brighten Filter Off (0
is
): Example of Unsharp/Brighten Filter On (1
is
):
Example of Gamma Correction
set to 50K:
Example of Gamma Correction
set to 0K:
Example of Gamma Correction
set to 255K: