^Optimize WBMPs

If you're going to create any graphics to be viewed on wireless devices, such as a handheld computer or cell phone, you need to use a special file format just for wireless bitmaps, called WBMP. Wireless bitmaps don't offer any type of compression—they don't need it—because files saved as WBMPs are limited to using only black and white. (See other WBMP characteristics in Table 10-5.)

TRY IT To optimize an image as a WBMP in Photoshop, perform the following steps:

• In Photoshop choose File I Save For Web. In ImageReady choose Window I Optimize to display the Optimize palette.

• Click the 2-Up tab to display your original image on the left (or top) and the optimized file on the right (or bottom).

• If necessary, use the Slice Select tool to select the slice you want to optimize. Otherwise, if no slices exist, continue following these steps to optimize the entire image.

• From the File Type menu, select WBMP. Because WBMP files only contain two colors (black and white), you don't have any options regarding color. In fact, the only option you have is whether to use dithering in areas that previously had color to simulate a third color in the image.



Color mode

1-bit (black and white only)

Compression method



Not supported


Not supported


Not supported

File type


Table 10-5 WBMP Format Characteristics

Table 10-5 WBMP Format Characteristics

• When you're finished, in Photoshop click Save to save the slice or file using the selected optimization settings. (To save your settings without actually saving the slice or file, click Done to return to the main Photoshop window.) In ImageReady choose File I Save Optimized or Save Optimized As.

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