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Chapter 4. Creating Web Images > Interlacing GIF Images

Interlacing GIF Images

Interlacing an image prepares it so that a browser can show it at gradually increasing resolutions. Although the initial image is blurry, the visitor does not have to wait for the finished image to appear. Instead, the visitor can scroll around the page and then return when the image is complete.

To interlace an image:

1.
Open the image in Photoshop.

2.
Choose File > Export > GIF89a Export.

3.
Check the Interlaced option in the dialog box that appears. The box is slightly different for RGB (Figure 4.47) vs. indexed-color images (Figure 4.48), but the effect is the same.

Figure 4.47. If you are exporting a GIF image from RGB mode, the Interlaced option will appear in the bottom-left corner of the GIF89a Export dialog box.


Figure 4.48. If the image was in indexed color, the Interlace option appears at the right in the center of the dialog box.


4.
Click OK.

5.
Enter a short name and extension in the dialog box that appears.

Tip

For information on creating JPEG images that appear gradually, similar to the interlacing effect in GIF images, consult Creating JPEG Images on page 76.

Figure 4.49. A browser will show the interlaced image gradually, allowing the visitor to move around the page and read the text while the image comes into full view.



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