Adobe Photoshop CS6, User Manual

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Pattern Applies a halftone-like square pattern to simulate any colors not in the color table.
Noise Applies a random pattern similar to the Diffusion dither method, but without diffusing the pattern across adjacent pixels. No seams
appear with the Noise dither method.
Transparency and Matte Determines how transparent pixels in the image are optimized.
To make fully transparent pixels transparent and blend partially transparent pixels with a color, select Transparency and select a matte color.
To fill fully transparent pixels with a color and blend partially transparent pixels with the same color, select a matte color and deselect
Transparency.
To select a matte color, click the Matte color swatch and select a color in the color picker. Alternatively, select an option from the Matte
menu: Eyedropper Color (to use the color in the eyedropper sample box), Foreground Color, Background Color, White, Black, or Other (to
use the color picker).
Note: The Foreground Color andBackground Color options are only available in Photoshop.
Examples of transparency and matting
A. Original image B. Transparency selected with a matte color C. Transparency selected with no matting D. Transparency
deselected with a matte color
Transparency Dithering When the Transparency option is selected, you can choose a method for dithering partially transparent pixels:
No Transparency Dither applies no dither to partially transparent pixels in the image.
DiffusionTransparency Dither applies a random pattern that is usually less noticeable than Pattern dither. The dither effects are diffused
across adjacent pixels. If you select this algorithm, specify a Dither percentage to control the amount of dithering that is applied to the image.
Pattern Transparency Dither applies a halftone-like square pattern to partially transparent pixels.
Noise Transparency Dither applies a random pattern similar to the Diffusion algorithm, but without diffusing the pattern across adjacent pixels.
No seams appear with the Noise algorithm.