Corel PaintShop Pro X7, DE User's Guide Page 774

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770 Corel PaintShop Pro X7 User Guide
The PNG Optimizer dialog box appears. The preview areas show
the current image on the left and the resulting PNG file on the
right.
2 Click the Colors tab, and choose one of the following image type
options:
Palette-Based — for images with 256 colors or less
• Grayscale (8-bit)
• 16.7 million color (24-bit)
If you choose the Palette-Based method, you can choose the
number of colors in the image and the amount of dithering
applied.
3 Click the Transparency tab, and choose one of the following
transparency types:
No transparency — saves the image without transparency
Single color transparency — lets you make one color
transparent by clicking a color swatch or clicking a color in the
image, and entering a value in the Tolerance control.
Alpha channel transparency — uses the current selection or
alpha channel transparency of the image. You can choose which
part of the image will be transparent by choosing Existing image
or layer transparency, Existing alpha channel transparency,
Inside the current selection, or Outside the current selection
option.
4 Click the Gamma tab, and set or type a value in the Gamma
control if you want to change the default value.
5 Click the Format tab, choose one of the following options:
Non-interlaced — the image downloads one line at a time,
starting from the top
Interlaced — the image is displayed incrementally in several
passes; detail is added with each pass. Use this option with
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