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Chapter 19: Sharing and Creating Images for the Web
460
Layers
Because none of the current Web browsers can display layered
images, you need to flatten an image before saving it for the Web.
Flatten it by choosing Layers > Merge > Merge All (Flatten).
Color Depth
Some computers are only capable of displaying up to 256 colors. If
an image on a Web page contains more colors, the Web browser uses
its own dithering method to display the image. This can produce
color distortion. If you reduce the color depth of the image to 8 bits
(256 colors) before placing it on your Web page, its appearance will
be more consistent.
File Size
File size affects the majority of users accessing a Web page. As the
size of an image file increases, it takes more time to download, so
viewers have a longer wait. Use a file format that reduces the image
size most efficiently while keeping the quality as high as possible.
Web File Formats
Choose from the following file formats when saving image for use
on the Web:
GIF Use this format to compress line art and images with areas of
similar colors. It supports 8-bit (256) color. There are two
versions of GIF: 89a, which can save transparency and animation
information, and 87a, which cannot. Both are recognized by most
browsers and use lossless compression.
JPEG Use this format to compress photographic images. It
supports 24-bit (16 million) color, uses lossy compression, and is
recognized by most browsers.
PNG This format compresses most images efficiently. It supports
up to 24-bit (16 million) color and uses lossless compression. It
is recognized by most browsers, however many features of this
format are not available.
Wireless Bitmap (WBMP) This format is used with many wireless
devices. The images are black and white and have lossless
compression.
Lossy vs. Lossless
compression
Lossy compression is a
compression method that
eliminates data to reduce the file
size, while lossless compression
retains all of the original image
data and reduces the file size by
storing patterns of pixels in the
image.
470


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