Processing full color images places great demands on both the CPU and memory. The amount of memory required to process an image is directly proportional to both the dimensions (paper size) and the resolution (DPI, or Dots Per Inch) of the image. If either of the following driver settings are used, the amount of memory required to process the image will be considerably higher:

1.The Watermark option is enabled.

2.The Color Reduction option is set to Reduce to optimal palette and you are printing in color.

As an example of the amount of memory involved, consider a standard 8.5" X 11" document printed in color at 600 DPI. In order to perform any of the operations listed above, the entire image must first be loaded into memory. The calculation of the amount of memory required is:

memory required = (number of pixels in image) X (number of bytes per pixel)

The total number of pixels in an image is equal to the (width of the image X the horizontal resolution) X (height of the image X vertical resolution). Furthermore, each pixel in a full color image uses 3 bytes to store color information. Our calculation therefore expands to:

memory required = (8.5 X 600) X (11 X 600) X 3 = 100980000 bytes = 96.3Mb

No less than 96 megabytes of memory is required to hold the image in memory. If this much physical memory (RAM) is not available for the printing process, Windows will use virtual memory. The resultant I/O (reading/writing) operations to and from the hard disk significantly slows down the entire process.

Although there are no minimum requirements (except that virtual memory must be enabled) for using Raster Image Printer to process full color images, the following are the minimum requirements in order to achieve real-time processing of an 8.5" X 11" image in full color (no swapping to disk).

Resolution

RAM Required

600 DPI

256 megabytes

300 DPI

64 megabytes

200 DPI

32 megabytes

 

If you encounter heavy disk activity during the printing process, and find that the process as a whole takes an inordinately long time to complete, you can remedy the situation in any of the following ways (choose one):

1.Lower the resolution.

2.Print in black and white.

3.Disable all of the driver options listed above.

4.Decrease the paper size.

5.Add more RAM.