Corel PaintShop Pro Help : Creating images for the Web : Working with PNG files

Working with PNG files

Corel PaintShop Pro lets you optimize PNG files to maximize quality and minimize file size.

The PNG Optimizer dialog box contains three tabbed areas where you can configure the color, transparency, and format options of the file. The fourth page displays estimated download times of the image at various modem speeds.

PNG Optimizer Colors

You can choose the color depth for the PNG file — the greater the color depth, the longer it takes to download the image. The controls under the Colors tab of the PNG Optimizer dialog box let you select a color depth for your PNG image. For paletted images, you can select the method of color reduction, number of colors, and amount of dithering.

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 Back to Top

Edit workspace 

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You can click the Download Times tab to preview the file size of the compressed file and an estimate of the download time at four modem speeds.

To use the PNG wizard Back to Top

Edit workspace 

 

To
Do the following
Choose a color within the image
On page 2 or 3 of the wizard, move the cursor over the image, and click a color. The color swatch displays the color you clicked.
Choose a color using the Color dialog box.
On page 2 or 3 of the wizard, click the color swatch to open the Color dialog box.
Change a setting
On page 6 of the wizard, click Back to return to the previous pages. Then, change the settings you want, and return to page 6 to view the results.
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