Operation Manual

355
USING DREAMWEAVER
Working with other applications
Last updated 3/28/2012
Matte Allows you to set the background of the image. You can maintain the transparency of a 32-bpc (bits per
channel) PNG by clicking the transparency icon in the Matte dialog box. You can also use Matte to anti-alias soft-
edged objects that lie directly above the canvas by matching the matte color to the target background.
Remove Unused Colors Reduces file size by removing colors not used in the image.
Optimize to Size Specifies the image size, in kilobytes. For 8-bpc images, the wizard attempts to achieve the requested
file size by adjusting the number of colors or dithering.
GIF and PNG image options
In the Options tab, you can set a transparency value for individual colors in GIF and 8-bpc PNG images so that the
background of the web page is visible through areas with those colors. Do this by adjusting the color palette on the left
of the Options tab. PNG images that have 32-bpc format automatically contain transparency, though you won’t see a
transparency option for 32-bpc PNGs in the Optimize panel.
Palette Set to Adaptive by default. Select one of the saved color palette settings from the pop-up menu if you want to
use a preset set of options
Loss Set to 0 by default. Not applicable to PNG images.
Dither Approximates colors not in the current palette by alternating similar-colored pixels so that they appear to blend
to the missing color. Dithering is especially helpful when exporting images with complex blends or gradients, or when
exporting photographic images to an 8-bpc graphic format such as GIF. Not selected by default.
Note: Dithering can greatly increase file size.
Number Of Colors List Set to 256 by default. The number of colors is dependent on the current behavior of the palette.
For example, the "Web 216" palette only displays 216 colors.
Color palette The display of colors varies depending on the selected palette behavior and maximum number of colors.
Palette Tools Click any pixel in the palette and then click these icons to change, add, or delete color, or to make a color
transparent, web safe, or locked.
Select Transparency Color Icons These buttons allow you to select, add, or remove a palette color. For example, if you
choose the Select Transparency Color option, you can click any pixel in the palette or on a point of color in the preview
panel to render it transparent.
Transparency Pop-Up Menu Allows you to set index, alpha, or no transparency. A gray-and-white checkerboard on
document previews denotes transparent areas. To see how your choices affect the image, choose 2-up or 4-up in the
image preview and click an image other than the original.
• Index Use index transparency when exporting GIF images that contain transparent areas. With index
transparency, you set specific colors to be transparent upon export. Index transparency turns on or turns off pixels
with specific color values.
• Alpha Use alpha transparency when exporting 8-bpc PNG images that contain transparent areas. Alpha
transparency allows gradient transparency and semi-opaque pixels.
Matte Lets you set the background of the image. You can maintain the transparency of a 32-bpc PNG by clicking the
transparency icon in the Matte dialog box. You can also use Matte to anti-alias soft-edged objects that lie directly above
the canvas by matching the matte color to the target background.
Remove Unused Colors Reduces file size by removing colors not used in the image.
Interlaced Browser Display Displays an interlaced image initially at low resolution and progressively increases to full
resolution during download. Not selected by default.