ADOBE PHOTOSHOP ELEMENTS 9

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USING PHOTOSHOP ELEMENTS 9 Optimizing for the web 284 More Help topics “Adding layers” on page 59 “Optimized file formats for the web” on page 276 Preserve background transparency in a GIF or PNG image GIF and PNG-8 formats support one level of transparency—pixels can be fully transparent or fully opaque, but not partially transparent. (By contrast, PNG-24 format supports multilevel transparency; that is, you can have up to 256 degrees of transparency in an image, ranging from opaque to completely transparent.) 1 In the Edit workspace, open or create an image that contains transparency, and choose File > Save For Web. 2 In the Save For Web dialog box, select GIF, PNG-8, or PNG-24 as the optimization format. 3 Select Transparency. 4 For the GIF and PNG-8 formats, specify how to treat partially transparent pixels in the original image. You can blend these pixels with a matte color, or you can create hard-edged transparency. More Help topics “About the GIF format” on page 278 “About the PNG-8 format” on page 278 “About the PNG-24 format” on page 279 Create a matted GIF or PNG image When you know the background color of the web page on which an image will be displayed, you can use the matting feature to fill or blend transparent pixels with a matte color that matches the web page background. 1 In the Edit workspace, open or create an image that contains transparency, and choose File > Save For Web. 2 In the Save For Web dialog box, select GIF, PNG-8, or PNG-24 as the optimization format. 3 For GIF and PNG-8 format, do one of the following: • To keep fully transparent pixels transparent, and blend partially transparent pixels with the matte color, select Transparency. This option prevents the halo effect you see when you place an anti-aliased image on a web page background that differs from the image background. This option also prevents the jagged edges of hard-edged transparency. • To fill transparent pixels with the matte color and blend partially transparent pixels with the matte color, deselect Transparency. 4 Select a color from the Matte menu: • Eyedropper Color (to use the color in the eyedropper sample box) • White, Black, or Other (to select a color using the Color Picker) More Help topics “About the GIF format” on page 278 “About the PNG-8 format” on page 278 “About the PNG-24 format” on page 279 Last updated 1/27/2011
USING PHOTOSHOP ELEMENTS 9 Optimizing for the web 285 Create hard-edged transparency in a GIF or PNG-8 file Use hard-edged transparency when you don’t know the background color of a web page, or when the web page background contains a texture or pattern. However, keep in mind that hard-edged transparency can cause jagged edges in the image. 1 In the Edit workspace, open or create an image that contains transparency, and choose File > Save For Web. 2 In the Save For Web dialog box, select GIF or PNG-8 as the optimization format. 3 Select Transparency. 4 Select None from the Matte menu. More Help topics “About the GIF format” on page 278 “About the PNG-8 format” on page 278 Create a matted JPEG image Although the JPEG format does not support transparency, you can specify a matte color to simulate the appearance of transparency in the original image. The matte color fills fully transparent pixels and blends with partially transparent pixels. When you place the JPEG on a web page with a background that matches the matte color, the image appears to blend with the background. 1 In the Edit workspace, open or create an image that contains transparency, and choose File > Save For Web. 2 In the Save For Web dialog box, select JPEG as the optimization format. 3 Select a color from the Matte menu: None, Eyedropper Color (to use the color in the eyedropper sample box), White, Black, or Other (to select a color using the Color Picker). When you select None, white is used as the matte color. More Help topics “About the JPEG format” on page 277 Dithering in web images About dithering Most web images are created by designers using 24-bit color displays (which display over 16 million colors), although some users view web pages on computers with 8-bit color displays (which display only 256 colors). As a result, web images often contain colors not available on some computers. Computers use a technique called dithering to simulate colors they can’t display. Dithering uses adjacent pixels of different colors to give the appearance of a third color. For example, a red color and a yellow color may dither in a mosaic pattern to produce the illusion of an orange color that the 8-bit color panel doesn’t contain. Last updated 1/27/2011
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ADOBE PHOTOSHOP ELEMENTS 9

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