Portable Network Graphics (PNG)
The Portable Network Graphics (PNG) file format is an excellent file format for lossless, portable, and well-compressed storage of bitmaps. It takes up a minimum amount of disk space and can be easily read and exchanged between computers. The Portable Network Graphics format provides a replacement for the GIF format and can also replace many common uses of the TIFF format.
The Portable Network Graphics format is designed to work well in online viewing, such as on the Web, and it’s fully streamable with a progressive display option. Some Web browsers do not support all formatting and features. You can export images to the Portable Network Graphics file format if you want to use transparent backgrounds, image interlacing, image maps, or animation in your Web pages.
Exporting graphics to the Portable Network Graphics format converts them to bitmaps that can be used in desktop publishing programs and Microsoft Office applications. You can also edit Portable Network Graphics in image-editing programs such as Corel PHOTO-PAINT and Adobe Photoshop.
You can also save images to the GIF and JPEG formats to use on the Internet. If you want to publish an image to the Web but are not sure which format to use, see “Optimizing bitmaps for the Web.”
To import a Portable Network Graphics file |  |
Import.|
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(Windows Vista) Choose PNG – Portable Network Graphics (*.png) from the list box next to the File name box.
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Click the drawing page.
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You can also
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Resample a graphic while importing
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For more information, see “To resample a bitmap while importing.”
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Crop a graphic while importing
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For more information, see “To crop a bitmap while importing.”
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To export a Portable Network Graphics file | |
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In the Convert to bitmap dialog box, adjust the width, height, resolution, color mode, or any of the other settings, and click OK.
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Image color — makes the color you click on the Color Palette transparent
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To display the image in the Web browser gradually, so that you can see portions of the image before it finishes loading, enable the Interlace image check box.
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You can specify the transparent color by using the Eyedropper tool to click a color in the Original window or by moving the Index slider.
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You can zoom in to get a closer look at the image by clicking in the Original window. You can zoom out by right-clicking in the Original window.
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Portable Network Graphics (PNG) technical notes | |
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You can import Portable Networks Graphics (PNG) files from 1-bit black and white to 24-bit color; 48-bit color is not supported.
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Masks and indexed-color, grayscale, and true color images are supported. Masks, however, are not saved in 1-bit black-and-white or 8-bit paletted files.
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LZ77 compression is supported, and the maximum image size is 30,000 × 30,000 pixels. Sample depths range from 1 to 16 bits.
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