Adding Noise To An Image - MACROMEDIA FIREWORKS MX 2004-USING FIREWORKS Use Manual

Drag the Threshold slider to select a threshold of 0 to 255.
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Values between 2 and 25 are most commonly used. An increase in threshold sharpens only
those pixels of a higher contrast in the image. A decrease in threshold includes pixels of lower
contrast. A threshold of 0 sharpens all pixels in the image.
Click OK.
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Adding noise to an image

When viewed at high magnification levels, most images obtained from digital cameras and
scanners do not have perfectly uniform colors. Instead, the colors you see consist of pixels of
many different colors. In image editing, "noise" refers to these random color variations in the
pixels that make up an image.
Sometimes, such as when you are pasting part of one image into another, the difference in the
amount of random color variation in the two images can stand out, preventing the images from
blending together smoothly. In such a case, you can add noise to one or both images to create the
illusion that both images come from the same source. You can also add noise to an image for
artistic reasons, for instance, to simulate an old photograph or static on a television screen.
Original photograph; after adding noise
Adding noise to an image 53