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Chapter 19: Sharing and Creating Images for the Web
468
PNG Optimizer Transparency Tab
The option you choose in this tab determines which area of the
image becomes transparent. To create a transparency from a
selection, make the selection before opening the PNG Optimizer
dialog.
1 For the type of transparency, choose from these options:
No transparency Saves the image without transparency.
Single color transparency Makes one color transparent. If the
image contains transparency, then you can then select the
Existing Image or Layer Transparency option (described
below). If the image does not contain a transparency, then
select the Areas that Match this Color option. The Single
Color Transparency option usually creates a smaller file than
the Alpha Channel Transparency option, but selecting it
causes the image to lose existing alpha channel transparency.
Alpha channel transparency Uses the image’s alpha channel
transparency. Because paletted images cannot contain alpha
channels, this option is available only when you select
Greyscale or 16 million color option on the Colors tab.
2 For the areas of the image to be transparent, choose from these
options:
Existing image or layer transparency Uses the current
transparency information. For paletted transparency and alpha
transparency images, the alpha channel is used to create
transparency
Inside the current selection For images with a selection, this
option makes transparent everything within the selection.
Outside the current selection For images with a selection, this
option makes transparent everything outside the selection.
Areas that match this color Click the color box to select any
color. Or, to choose a color from the image, move the cursor
over the image, and click the color. In the Tolerance edit box,
set a tolerance factor that indicates how closely colors must
match the selected color before they become transparent.
478


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