Lexmark C780, C782 manual Solving color quality problems, What is RGB color?

Troubleshooting

Symptom	Cause	Solution
Solid color pages	• The print cartridges are	• Replace the print cartridge that corresponds to
	defective.	the color displayed on the control panel.
	• Your printer requires servicing.	• Call for service.
The paper curls badly	• The Type, Texture, and Weight	• Change Paper Type, Paper Texture, and Paper
once it prints and exits to	settings are not appropriate for	Weight to match the paper or specialty media
a bin.	the type of paper or specialty	loaded in the printer.
	media you are using.	• Load paper from a fresh package.
	• The paper has been stored in a	• Store paper in its original wrapper until you use it.
	high humidity environment.	• For more information, see Storing paper.

Solving color quality problems

This section helps answer some basic color-related questions and describes how some of the features provided in the Quality Menu can be used to solve typical color problems.

Note: See the quick reference page entitled “Print quality and troubleshooting guide” which provides solutions for common print quality problems, some of which may affect the color quality of the printed output.

Frequently asked questions (FAQ) about color printing

What is RGB color?

Red, green, and blue light can be added together in various amounts to produce a large range of colors observed in nature. For example, red and green light can be combined to create yellow light. Televisions and computer monitors create colors in this manner. RGB color is a method of describing colors by indicating the amount of red, green, and blue light needed to reproduce a particular color.

What is CMYK color?

Cyan, magenta, yellow, and black inks or toners can be printed in various amounts to produce a large range of colors observed in nature. For example, cyan and yellow can be combined to create green. Printing presses, inkjet printers, and color laser printers create colors in this manner. CMYK color is a method of describing colors by indicating the amount of cyan, magenta, yellow, and black needed to reproduce a particular color.

How is color specified in a document to be printed?

Software applications typically specify document color using RGB or CMYK color combinations. Additionally, they commonly let users modify the color of each object in a document. Since the procedures to modify colors vary depending on the application, see the software application Help section for instruction.

How does the printer know what color to print?

When a user prints a document, information describing the type and color of each object in the document is sent to the printer. The color information is passed through color conversion tables that translate the color into appropriate amounts of cyan, magenta, yellow, and black toner needed to produce the desired color. The object type information lets different color conversion tables be used for different types of objects. For example, it is possible to apply one type of color conversion table to text while applying a different color conversion table to photographic images.

Solving color quality problems

97