ORIS PDF Tuner Version 4.4.8 User Manual - image2output - Support

Image Filter Functions
Adding and Removing Noise
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Adding and Removing Noise
ORIS PDF Tuner allows you to add noise and to smoothen noisy images.
The latter is achieved by replacing individual pixels which differ enormously
from their neighboring pixels by neighboring pixels.
Removing Noise
1. Open the image (see page 20-6).
Filters can only be applied if all pixels are loaded (see also
page 20-8).
2. If you only want to remove noise from a particular image area, create
or select a restricting mask (see page 22-13).
3. Select IMAGE | FILTERS.
4. Select DE-NOISE in the MENU window.
The smoothening process starts. It may take some time to finish as it
involves complex calculations. When finished, the function is grayed
out in the MENU window.
5. You can compare the modified image with the original. To do so, use
the toggle function SHOW BEFORE or press F4.
Annotation
It is usually advisable to perform first the DE-NOISE and then the SHARP-
NESS function.
To understand the principle of the DE-NOISE function, you should open
an image, sharpen it several times and then select the DE-NOISE function.
Now apply the DE-NOISE function to an image which has not been
sharpened and compare the two results.
Adding Noise
1. Open the image (see page 20-6).
Filters can only be applied if all pixels are loaded (see also
page 20-8).
2. If you only want to add noise to a particular image area, create or select
a restricting mask (see page 22-13).
3. Select IMAGE | FILTERS.
4. You can vary the noise level between 0% (no noise) and 100% (maximum
noise).
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