Corel PaintShop Pro X7, DE User's Guide Page 773

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Creating images for the Web 769
PNG Optimizer Gamma
PNG images contain a gAMA chunk, which controls gamma levels of
an image. The gamma setting helps the image appear consistent
across multiple display devices. If in doubt, you should use the default
PC value.
PNG Optimizer Transparency
You can choose to base transparency on existing image or layer
transparency, or you can sample the 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. You can also base transparency
on the alpha channel.
PNG Optimizer Format
PNG images can be interlaced or non-interlaced, which affects how the
image is displayed on a computer with a slow Internet connection.
PNG Optimizer Download Times
The size of the compressed file and an estimate of the download time
at four modem speeds are displayed under the Download Times tab of
the PNG Optimizer dialog box.
Using the PNG wizard
You can open the PNG wizard from the PNG Optimizer dialog box. The
wizard guides you through the steps of optimizing a PNG file.
To optimize and save a PNG file
Edit workspace
1 Choose File Export PNG Optimizer.
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