Note: if the fields are dimmed, click Check-Out or Local Edit button.

The below settings, except Compress pages, exists independently for color and grayscale images.

Depending on the settings you choose, compression and downsampling can significantly reduce the size of a PDF file with little or no loss of detail and precision.

If you plan to use the PDF file on the web, use downsampling to allow for higher compression. If you plan to print the PDF file at high resolution, check with your prepress service provider before setting compression and downsampling options.

Downsampling refers to decreasing the number of pixels in an image. To downsample color or grayscale images, choose an interpolation method - average downsampling, bicubic downsampling, or subsampling - and enter the desired resolution (in pixels per inch). Then enter a resolution in the For Images Above text box. All images with resolution above this threshold will be downsampled.

Color images (Downsampling method)

Available are Do not downsample, Bicubic downsampling to, Average downsampling to, and Subsampling to.

Do not downasample Do not perform any downsampling

Average Downsampling To Averages the pixels in a sample area and replaces the entire area with the average pixel color at the specified resolution.

Subsampling To Chooses a pixel in the center of the sample area and replaces the entire area with that pixel color. Subsampling significantly reduces the conversion time compared with downsampling but results in images that are less smooth and continuous.

Bicubic Downsampling To Uses a weighted average to determine pixel color, which usually yields better results than the simple averaging method of downsampling. Bicubic is the slowest but most precise method, resulting in the smoothest tonal gradations.

Downsampling amount The value to which downsample.

For images above Downsampling, if selected, applies only on images with specified (or higher) ppi.

Image quality Determines the amount of compression that is applied. Specify desired percentage. 100% means the highest quality possible.

Grayscale images (Downsampling method)

Available are Do not downsample, Bicubic downsampling to, Average downsampling to, and Subsampling to.

Do not downasample Do not perform any downsampling

Average Downsampling To Averages the pixels in a sample area and replaces the entire area with the average pixel color at the specified resolution.

Subsampling To Chooses a pixel in the center of the sample area and replaces the entire area with that pixel color. Subsampling significantly reduces the conversion time compared with downsampling but results in images that are less smooth and continuous.

Bicubic Downsampling To Uses a weighted average to determine pixel color, which usually yields better results than the simple averaging method of downsampling. Bicubic is the slowest but most precise method, resulting in the smoothest tonal gradations.

Downsampling amount The value to which downsample.

For images above Downsampling, if selected, applies only on images with specified (or higher) ppi.

Image quality Determines the amount of compression that is applied. Specify desired percentage. 100% means the highest quality possible.

Compression

None, JPEG, ZIP, JPEG2000

JPEG Is suitable for grayscale or color images. JPEG compression is lossy, which means that it removes image data and may reduce image quality; however, it attempts to reduce file size with a minimal loss of information. Because JPEG compression eliminates data, it can achieve much smaller files sizes than ZIP compression.

ZIP Works well on images with large areas of single colors or repeating patterns, and for black-and-white images that contain repeating patterns. ZIP compression can be lossless or lossy, depending on the Image Quality setting.

JPEG 2000 Is the international standard for the compression and packaging of image data. Like JPEG compression, JPEG 2000 compression is suitable for grayscale or color images. It also provides additional advantages, such as progressive display. The JPEG 2000 option is only available when Compatibility is set to Acrobat 6 (PDF 1.5) or later.

Vector (PS/EPS/PDF) objects on page

Default

Rasterize All (RGB)

Rasterize All (CMYK)

Rasterize All (Grayscale)

Resample All

Compress pages

Select whether to compress PDF pages or not.

Optimize for fast web view

Option