Downsampling bitmaps in a PDF file

You can reduce file size by downsampling bitmaps. Bitmaps are made up of pixels. When you downsample a bitmap, the number of pixels per line decreases. The decrease in pixels per line results in a decrease in file size. The Publish To PDF feature lets you downsample color, grayscale, or monochrome bitmaps individually.

To downsample color bitmaps

1 Click File, Publish To PDF.

2 Click the Objects tab.

3 Enable the Color check box.

4 Type a number in the Color box.

To downsample grayscale bitmaps

1 Follow steps 1 and 2 from the previous procedure.

2 Enable the Grayscale check box.

3 Type a number in the Grayscale box.

To downsample monochrome bitmaps

1 Follow steps 1 and 2 from the "To downsample color bitmaps" procedure.

2 Enable the Monochrome check box.

3 Type a number in the Monochrome box.

• Downsampling color, grayscale, or monochrome bitmaps is effective only when the resolution of the bitmaps is higher than the resolution specified in the Bitmap Downsampling section.

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