In order for an image to appear on a web page it must be in either GIF or JPEG format. Use GIF format for images that are solid colors with sharp borders. Use JPEG format for images with many colors or gradations of color. Fireworks has export features designed specifically for web graphics. (Also see Photoshop Export).

Please move your cursor over the image below to view the same options in Photoshop. (Note : the link serves no purpose).

If both images appear as GIFs, then click on any one image, and in the Format box (in the upper left hand corner) choose JPEG. Once you have observed the difference between the two images, click on the left button in the image on the left, and click Ok.

Finally, name and save the file.

Photoshop tutorial :

2. Open the file you exported above in Photoshop and choose Save As. When the Save As, window options, click on the Save As drop-down menu and choose JPEG format. (see Photoshop Export for more information about these options).

3. Open this same image again in Photoshop. This time save it as a GIF. Choose File > Save As and select Compuserve Gif in the Save As drop-down menu. This will bring up the Indexed Color window*. Click Ok, which will bring up the GIF options window, click Ok again.

*(See Photoshop Export for more information about Indexed Color options).