Adobe 13101332 - Photoshop - Mac User Manual page 422

Adobe Photoshop Help
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To fill fully transparent pixels with the selected color and blend partially transparent
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pixels with the same color, select a matte color and deselect Transparency.
A
C
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
To select a matte color, click the Matte color swatch and select a color in the color picker.
Alternatively, choose an option from the Matte menu. The matte color should match the
background color of the Web page.
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.
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Diffusion Transparency Dither applies a random pattern that is usually less noticeable
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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 trans-
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parent pixels.
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Preparing Graphics for the Web
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