Adobe 29180155 - Photoshop Elements 4.0 Tutorial page 396

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.
Optimize as JPEG
JPEG is the standard format for compressing photographs.
1. Open an image and choose File > Save For Web.
2. Choose JPEG from the optimization format menu.
3. To optimize to a specific file size, click the arrow to the right of the Preset menu, and then click Optimize To File Size. Enter a
number in the Desired File Size text box, and select either Current Settings, which optimizes for the current settings, or Auto
Select GIF/JPEG, which automatically determines whether JPEG or GIF is the better format.
4. Do one of the following to specify the compression level:
Choose a quality option (Low, Medium, High, and so on) from the pop-up menu under the optimization format menu.
Click the arrow in the Quality menu and drag the Quality pop-up slider.
Enter a value between 0 and 100 in the Quality box.
The higher the Quality setting, the more detail is preserved in the optimized image, but the larger the file size. View the
optimized image at several quality settings to determine the best balance between quality and file size.
5. Select Progressive to display the image progressively in a web browser; that is, to display it first at a low resolution, and then
at progressively higher resolutions as downloading proceeds.
Note: Some browsers do not support progressive JPEGs.
6. To preserve the ICC profile of the original image in the optimized file, select ICC Profile.
Some browsers use ICC profiles for color correction. The ICC profile of the image depends on your current color setting.
7. If the original image contains transparency, select a Matte color that matches the background of your web page. Transparent
areas in your original image are filled with the Matte color.
8. To save your optimized image, click OK. In the Save Optimized As dialog box, type a filename, and click Save.
Optimize as GIF or PNG-8 format
GIF is the standard format for compressing images with large areas of solid colors and crisp details like those in line art, logos, or type. Like the
GIF format, PNG-8 supports transparency and efficiently compresses areas of solid color while preserving sharp detail; however, not all web
browsers can display PNG-8 files.
1. Open an image and choose File > Save For Web.
2. Choose GIF or PNG-8 from the optimization format menu.
3. To display an image at low resolution while the full-resolution image is downloading, select Interlaced. Interlacing can make
downloading time seem shorter and gives viewers feedback that downloading is in progress.
4. Under the optimization format menu, choose a color-reduction algorithm for generating the color lookup table:
Perceptual Creates a custom color table by giving priority to colors for which the human eye has greater sensitivity.
Selective Creates a color table similar to the Perceptual color table, but favoring broad areas of color and the preservation of
web colors. This color table usually produces images with the greatest color integrity. (Selective is the default choice.)
Adaptive Creates a custom color table by sampling colors from the spectrum appearing most commonly in the image. For
example, an image with only shades of green and blue produces a color table made primarily of greens and blues. Most
images concentrate colors in particular areas of the spectrum.
Restrictive (Web) Uses the standard, 216-color, web-safe color table common to the 8-bit (256-color) panels of Windows and
Mac OS. This option ensures that no browser dither is applied to colors when the image is displayed using 8-bit color. If your
image has fewer than 216 colors, unused colors are removed from the table.
5. To specify the maximum number of colors in the color panel, select a number from the Colors menu, enter a value in the text
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