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Chapter 4. Creating Web Images > Creating PNG Files

Creating PNG Files

Although GIF is the most popular image format on the Web today, the W3C hopes that tomorrow everyone will be inserting PNG images on their pages. PNG (pronounced ping) has many advantages over GIF, not least among them the fact that its compression scheme is not patented and thus software developers can implement it for free. It also compresses more effectively than GIF, is not lossy, and allows partial transparency. Its major disadvantage is that it is relatively unknown and the major browsers have taken a while to support it. In fact, while current versions of both Explorer and Communicator view PNG images inline, they still don't support all its features.

To create a PNG image:

Create an RGB image.

Choose File > Save As (Figure 4.67).

Figure 4.67. Choose File > Save As.

In the dialog box that appears, choose PNG in the Format pop-up menu and click Save (Figure 4.68). The PNG Options dialog box appears.

Figure 4.68. Give the file a name and choose PNG in the Format pop-up menu. Then click Save.

If desired, choose Adam7 to create an interlaced image (Figure 4.69).

Figure 4.69. Choose Adam7 under Interlace to have the PNG appear gradually in your visitors' browsers.

Click OK.


Unfortunately, Adobe has not made available information about the filters offered in Photoshop's PNG Options dialog box. They are for choosing different compression methods.


You can get more information about the PNG format on the PNG home page: http://www.cdrom.com/pub/png/png.html.

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