American Audio DCD-PRO240 User Manual Page 100

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Freeway Reference: Working with Graphics
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It is best to experiment and view your output in different browsers and on different platforms, taking into account both image quality
and file size. Note that in general, graphics may appear darker on a Windows PC than on a Mac.
For more information about creating and using color in Freeway, see Working with color on page 144.
Export settings for GIF graphics
Size
The Size area shows the byte size of your GIF graphic files. This value
depends on the dimensions, colors, and other attributes of your
graphic. Size information is only displayed when you have the Preview
Graphics option turned on (via the View menu) or if this graphic has
been published in your site. You can also get feedback on the overall
size of your page after you have previewed or published the site by
turning on Show File Sizes in the Site panel menu.
Colors
GIF images can have a maximum of 256 colors defined within them,
but you can affect how those colors are selected (see GIF color palettes
below and web-safe color on page 100). Freeway allows you to alter the
number of colors defined within the exported GIF image using a slider
or by editing the number of colors directly. Reducing the number of
colors can reduce the size of the resulting file.
GIF color palettes
The range of actual color values used in a GIF file is called the color palette. Freeway allows you to choose from three different color
palettes for your GIF images:
• Adaptive: Color values are chosen from the original color values in the source graphic. The palette will consist of color values which
are closest to those in the original image.
• Web 216: The colors are mapped to the nearest colors in the web-safe palette.
• Mac 256: The colors are mapped to the nearest colors in the Macintosh system palette.
The default color palette for your Freeway document can be set in the Document Setup dialog. To set the default color palette for all
subsequent documents, close all open Freeway documents and choose Document Setup… from the File menu. Any settings made in
the dialog will be applied to all new Freeway documents. Existing documents will retain the previous settings.
Bilinear
The Bilinear option causes graphics to be scaled more smoothly. You might want to turn this option off for some types of line art.
Dither
Dithering tries to match colors in your graphic using only those available in the browser. For example, a full color image uses thousands
of colors but GIF graphics are limited to a maximum of 256 colors. Dithering provides a way of making your graphic look as though it is
using a wider range of colors. On the other hand, dithering will generally increase the file size of your exported graphics. Dithering is off
by default for GIF graphics. Select the Dither checkbox to turn this effect on. The default for this option may be changed in Document
Setup.
Interlaced
Interlaced GIF graphics are displayed gradually as the file is downloaded by the browser. Your viewers
see the image forming as they wait for the full file to download. This setting is on by default. Interlaced
graphics may have slightly larger file sizes. To disable interlacing, deselect the Interlaced checkbox. The
default for this option may be changed using Document Setup.
Anti-alias
The Anti-alias option allows you to soften the outlines of GIF text and box shapes when the browser
displays them. Anti-aliased text can be difficult to read at small sizes, since the outline of letters is
blurred, so you may want to test this effect. The Anti-alias option is set to Auto by default, so Freeway
will automatically select an appropriate color with which to blend text into a background image or color
(see the screenshot, right). Select Off in the Anti-alias popup menu to disable this effect. You can also
choose a different color against which the text or shape will be blended.
When an image is anti-aliased, its color blends with the fill color of the box that contains it. If an image
or graphic text is in a GIF box that doesn’t have a background color, it is exported as transparent, which,
if anti-aliased, can produce an unwanted halo. When you’re using Freeway to export a GIF and you
don’t want it to be transparent, make sure its box has a fill color.
Although Freeway will anti-alias your graphic text by default, you can determine the minimum font size
to which this will apply. Choose Preferences… from the Freeway application menu, and select the Text
panel. The Minimum Anti-alias Size defaults to 0px. A larger minimum means that by default, smaller
fonts will not be anti-aliased. You can still choose to anti-alias desired text items in the Item Output
panel of the Inspector palette.
For more information on anti-aliasing, see Anti-aliasing on page 132.
Freeway Pro Freeway Express
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