The Noise Filters
Add Noise
The Add
Noise Filter has two options: Gaussian or
Uniform. The best way to use the Add Noise is when you want to disguise or cover up portions of an image that
you have added or modified. Also, the Add Noise Filter is also very useful when your image is too bright and
"clean". There are two kinds of Add Noise Filters, Uniform and Gaussian.Uniform
The Uniform Add
Noise Filter is useful when used on plain black and white or grayscale graphics. It gives a diffused look to
the picture. Since noise produces grainy images, noisy images are usually best printed on laser printers with
a lower resolution. This way, the noise will not ruin the picture because it will not be printed out at a
high enough resolution to matter.Gaussian
The Gaussian Add Noise Filter is not to be confused with
the Gaussian Blur Filter. You'll be really surprised if you do; it will produce a totally different,
hard-grained effect for the image.
This filter is best used for making textured images or simulating that effect.
Despeckle Noise
Filter
This Filter is useful when you want to clear up and soften sharp contrast areas within the image.
It is similar to some of the blur filters in this respect. The only difference is that the Despeckle Noise
Filter does not destroy the contents of an image.Dust and Scratches
This filter gets rid of (or tries to
get rid of) flaws in an image. Don't expect this to get rid of major flaws in an image, though.
Median Noise
This filter reduces the amount of random noise in an image. It
achieves this by taking the median brightness values of the surrounding pixels. The area of brightness is
determined by the user, with values 1 to 16 being the radius of the area. It is best not to use this
filter much, however, because it can seriously alter an image's appearance.
The
Sharpen Filters