PhotoshopElements
Control dither in web images
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Open
an image and choose File > Save For Web.
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Choose your optimization settings.
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Enter a value in the Dither text box, or click the Dither
menu arrow and drag the slider that appears.
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The Dither percentage controls the amount of dithering
that is applied to the image. A higher dithering percentage creates
the appearance of more colors and more detail in an image but can
also increase the file size. For optimal compression and display
quality, use the lowest percentage of application dither that provides
the color detail you require.