The Compression options allow you to choose how to compress the images and PDF files created to reduce the amount of physical disk space needed to store the then.

 

There are two main ways to reduce the size of the image:

use the Color Options on the Save tab to reduce the number of colors used in the image.

use the Compression option to compress the image data itself so it takes up less space

JPEG Image Compression

JPEG images created by Raster Image Printer can be created as 24-bit color and 8-bit greyscale.

The image quality level can be set for each color model; the higher the image quality the larger the file. This trade off between the compression level and image quality is due to the compression algorithm used by JPEG. The algorithm used is lossy, meaning that information is removed from the image in order to compress it.

JPEG compression works best on photographic images where the human eye will fill in the missing information. It does not work well on line drawings or text-based files as its lossy compression causes blurred lines or text.

Color - select one of the following image quality settings to use when creating a color JPEG image.

High Quality

Medium Quality

Low Quality

Greyscale - select one of the following image quality settings to use when creating a greyscale  JPEG image.

High Quality

Medium Quality

Low Quality

TIFF Image Compression

TIFF compression methods, with the exception of JPEG compression, do not affect the image quality. You may need to experiment with the compression methods to find the best balance between the size of the TIFF file and the quality of the images.

See Also: Reducing File Size with Compression Options

Color - select one of the following compression methods to use when compressing color TIFF images.

Uncompressed, RGB or CMYK

Low, Medium or High Quality JPG

Packbits, RGB or CMYK

LZW, RGB or CMYK

CMYK Compression and Viewing TIFF Images

Not all image viewers understand CMYK compression, and as a result, may not display the TIFF image correctly. For example, Microsoft Document Imaging is known to have this problem, while Windows Photo Gallery (on Vista) or Windows  Picture and Fax Viewer (on XP) do display the TIFF correctly.

 

Indexed - select one of the following compression methods to use when compressing indexed images.

Low, Medium or High Quality JPG

Packbits

LZW

None

Greyscale - select one of the following compression methods to use when  compressing greyscale images

Low, Medium or High Quality JPG

Packbits

LZW

None

Monochrome - select one of the following compression methods to use when compressing monochrome images

CCITT Group 4 Fax

CCITT Group 3 2D Fax

CCITT Group 3 1D Fax

CCITT Modified Huffman

LZW

Packbits

None

PDF Compression

PDF files created by Raster Image Printer are non-searchable, or raster, PDF files very similar to PDF files created from a scanner. A non-searchable PDF file is a series of one or more TIFF images wrapped in a PDF document. PDF compression methods, with the exception of JPEG compression, will not affect the image quality of the file. You may need to experiment with the compression methods to find the best balance between the size of the PDF and the quality of the images on the pages.

See Also: Reducing File Size with Compression Options

Use Compression - optionally turn off all compression in the PDF file. Compression is enabled by default for all PDF files created. Turning the compression options off will increase the size of your document.

ASCII format - store the PDF file in ASCII format. The ASCII format compression option creates a 7-bit compressed PDF file. This option is rarely needed anymore and is only included for compatibility with older networks and e-mail systems; leave this option unchecked to create an 8-bit compressed document.

Standard - optionally create the PDF file with PDF/A-1b compliance. The default, None, will create a PDF file that makes no special effort to to comply with the PDF/A-1b specifications, while choosing PDF/A-1b will create a PDF/A-1b compliant PDF file. A PDF file created with PDF/A-1b compliance is meant for long-term archiving of electronic documents and ensures that the document is visually correct. When creating a PDF/A compliant PDF file, all security options are automatically ignored and any LZW compression is replaced with ZIP compression.

Text and Line Art - select one of the following compression methods

None

Run Length

ZIP

LZW

Color Images - select one of the following compression methods to use when compressing color images.

None

Low, Medium or High Quality JPG

Run Length

ZIP

LZW

Indexed Images - select one of the following compression methods to use when compressing indexed images.

None

Low, Medium or High Quality JPG

Run Length

ZIP

LZW

Greyscale Images - select one of the following compression methods to use when compressing greyscale images

None

Low, Medium or High Quality JPG

Run Length

ZIP

LZW

Monochrome Images - select one of the following compression methods to use when compressing monochrome images

None

CCITT Group 3 1D

CCITT Group 3 2D Fax

CCITT Group 4 Fax

License

Launches the Activation Wizard as described in the Activating Raster Image Printer section if you are in trial mode.

If you have already activated Raster Image Printer , you will see a summary of your license information (see Viewing Your Activation Status for more details)

Restore Defaults

Restores this tab's settings back to the defaults when the driver was first installed.

Help

Brings up the on-line help for this tab.