Graphics Programs Reference
In-Depth Information
3
Select the Hand tool ( ) and click and drag directly on the image in either window to
reposition the image so you can see the four slices containing text.
The Save For Web window is broken into three main areas:
Toolbox
: the Toolbox provides you with tools for panning and zooming in your
image, selecting slices, and sampling color.
Preview window
: in addition to having the ability to view both the original and
optimized images individually, you can preview the original and optimized images
side-by-side in 2-up view or with up to three variations in the 4-up view.
Optimization settings
: the Optimization settings allow you to specify the format
and settings of your optimized i le.
How to choose web image formats
When you want to optimize an image for the Web, what format should you choose? Choose
the format best suited to the type of image you are using.
GIF
: an acronym for Graphic Interchange File, the GIF format is
usually used on the Web to display simple colored logos, motifs, and
other limited-tone imagery. The GIF format supports a maximum of
256 colors, as well as transparency. GIF is the only one of the four
formats here that supports built-in animation.
JPEG
: an acronym for Joint Photographic Experts Group, the JPEG
file format has found wide acceptance on the Web as the main format
for displaying photographs and other continuous-tone imagery. The
JPEG format supports a range of millions of colors, allowing for the
accurate display of a wide range of artwork.
PNG
: an acronym for Portable Network Graphics. PNG was intended
to blend the best of both the GIF and JPEG formats. PNG files come
in two different varieties: like GIF, PNG-8 can support up to 256
colors, while PNG-24 can support millions of colors, similar to the
JPEG format. Both PNG varieties support transparency and, as an
improvement on GIF's all-or-nothing transparency function, a PNG file supports varying
amounts of transparency so you can actually see through an image to your web page
contents. Older browsers, in particular IE6, do not support PNG transparency, but this is
seldom a problem, unless you specifically need to support the older browsers.
WBMP
: a standard format for optimizing images for mobile devices,
WBMP files are 1-bit, meaning they contain only black and white pixels.
