Reducing File Size with Color Reduction

All of the color reduction options are controlled through the Save tab in the Printing Preferences dialog. Close any open applications that you are printing from before making changes as not all applications will see your changes until they are re-started.

Changing the color reduction using the following steps is a global change, meaning that all applications will use these options when printing to Raster Image Printer.

See the following sections for information on color reduction and dithering methods:

Color Reduction

Dithering Methods

Step by Step Instructions

 

1.From the Start menu, go to All Programs - Raster Image Printer 11.0 - Properties...

2.Click the Save tab in the Printing Preferences dialog.

In the Color Options section:

change the Color Reduction as needed. The default setting of Reduce to optimal palette will reduce each page down to the smallest number of colors required to represent each page.

Select a Dithering Method to use when converting color to black and white (monochrome); the default is Halftone dithering.

3.Click the Apply button and then the OK button to set the changes.

4.Printing to Raster Image Printer from any application will now use the color reduction settings chosen.

Color Reduction

There are eight choices for color reduction:

 

Color Reduction

What it does...

Reduce to optimal palette

Reduces each page down to the smallest number of colors needed to represent the page.

Each page is counted separately, meaning the end result can be a JPG containing a mix of black and white, greyscale and color pages. If your pages are mixed black and white with occasional color, this method will often result in the smallest size file.

Reduce to black and white

All pages are reduced to monochrome, or black and white. This color reduction method uses the Dithering Method chosen to smooth the appearance of the text and information on the page.

Reduce to greyscale palette

Pages are reduced to a greyscale image composed exclusively of shades of neutral gray.

Reduce to 256 color palette

Reduce each page down to 256 colors.

Reduce to 16 color palette

Reduce each page down to 16 colors.

Reduce to optimal palette, max. 256  colors

Reduces each page down to the smallest number of colors needed to represent the page. Any color pages that result in more than 256 colors are reduced to 256 colors.

Reduce to optimal palette, max. 16 colors

Reduces each page down to the smallest number of colors needed to represent the page. Any color pages that result in more than 16 colors are reduced to 16 colors.

None

No color reduction is done. The color choice on the Paper/Quality tab determines if the page is rendered in full color or black and white.

Dithering Methods

The chosen Dithering Method only applies when Reduce to black and white is chosen. Dithering improves the appearance of color images that have been reduced to black and white. It is best to experiment when trying to determine the best dithering method for a given source image as the same dithering method may produce different results in different situations. An example of the different methods and the resulting images are show below.

Original image

Original image

Floyd-Steinberg

Floyd-Steinberg

Burkes

Burkes

Bayer

Bayer

Halftone

Halftone

 

 

Halftone Dithering

As halftone dithering simulates the image using black dots of varying size and spacing on a white background, it is only applied when the image is being reduced to black and white. If halftone dithering is selected and a color image is being created, Floyd-Steinberg dithering is used instead.