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Corel PaintShop Pro X8 User Guide
Web page around the logo. In this case, you can choose not to display
one color. Most Web browsers support this option, effectively making
that color transparent.
The GIF Optimizer dialog box contains four tabbed areas in which to
configure the transparency, color, and format options of the file. The
fifth tabbed area displays estimated download times of the image at
various modem speeds.
GIF Optimizer Transparency
You can choose to base transparency on existing image or layer
transparency, or you can sample a color in the image that you want to
make transparent. If you have a selection in your image, you can base
the transparency on the selection.
GIF Optimizer Partial Transparency
A GIF file cannot contain partially transparent pixels. All pixels must be
either transparent or opaque (visible). Original images may contain
partially transparent pixels if the image does not have a background
layer, and you have reduced the opacity of a layer, added a mask,
feathered a selection, or used a brush at a reduced opacity setting. You
can determine whether the partially transparent pixels become
transparent or opaque, and whether they are blended with another
color.
Important! If you mark the
None
option under the Transparency
tab, the options in this area are unavailable.
GIF Optimizer Colors
GIF images have an 8-bit color depth, which means they can display up
to 256 colors. Because these colors are stored in a palette, an image
containing 256 or fewer colors is called a paletted image. To reduce file
size, you can have fewer than 256 colors. You can use the options
