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Web graphics

Last updated 9/13/2015

Images in GIF and PNG-8 formats, sometimes called indexed-color images, can display up to 256 colors. To convert an

image to indexed-color format, Photoshop Elements builds a color lookup table. If a color in the original image does

not appear in the color lookup table, the application either chooses the closest color in the table or simulates the color

using a combination of available colors.

JPEG and PNG-24 files support 24-bit color, so they can display up to 16 million colors. Depending on the format, you

can specify image quality, background transparency or matting, color display, and the method a browser should use to

display the image while downloading.

The appearance of an image on the web also depends on the colors displayed by the computer platform, operating

system, monitor, and browser. You may want to preview images in different browsers and on different platforms to see

how they will appear on the web.

Apply a preset optimization setting

You can quickly and easily optimize an image for the web by choosing a predefined optimization setting, called a preset,

from the Preset menu near the upper-right corner of the Save For Web dialog box. Presets are tailored to meet the

optimization needs of different types of images.

The name of each preset reflects its file format and quality level. For example, choose JPEG High to optimize an image

in JPEG format with high image quality and low compression. Choose GIF 32 Dithered to optimize an image in GIF

format, reduce the number of colors to 32, and apply dithering.

1 In the Save For Web dialog box, choose a setting name from the Preset menu, and then click OK.

2 In the Save Optimized As dialog box, type a filename and click Save.

Note: If you change the options in a preset, the Preset menu displays the word “[Unnamed]”. You cannot save a custom

setting; however, the current settings appear in the Save For Web dialog box the next time you display it.

More Help topics

Preview an optimized image in a web browser

Preview variations in color display

View estimated download time

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.

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