Color shift printing without using special marking materials

A method comprising:

• receiving a document to be printed into a computerized device, said document including a designation of an apparent color shift region within said document, said apparent color shift region comprising a background and a design in a foreground;
• automatically, using said computerized device, selecting a first color to have a first reflectance property as said background and a second color to have a second reflectance property different from said first reflectance property as said foreground for use in said apparent color shift region;
• automatically, using said computerized device, controlling a first pixel density of said first color to be less than a second pixel density of said second color within said apparent color shift region;
• and
• printing said document to produce a printed document, using a printing device operatively connected to said computerized device,
• said selecting said first color and said second color, and said controlling said first pixel density to be less than said second pixel density causing said second color to have a greater change in brightness appearance relative to a change in brightness appearance of said first color when said printed document is viewed from different angles relative to a light source.

A system comprising:

• a processor;
• and
• a printer operatively connected to said processor,
• said processor receiving a document to be printed, said document including a designation of an apparent color shift region within said document,
• said processor automatically selecting a first color to have a first reflectance property and a second color to have a second reflectance property different from said first reflectance property for use in said apparent color shift region,
• said processor automatically controlling a first pixel density of said first color to be less than a second pixel density of said second color within said apparent color shift region,
• said printer printing said document to produce a printed document, and
• said selecting said first color and said second color, and said controlling said first pixel density to be less than said second pixel density causing said second color to have a greater change in brightness appearance relative to a change in brightness appearance of said first color when said printed document is viewed from different angles relative to a light source.

A system comprising:

• a processor;
• and
• a printer operatively connected to said processor,
• said processor receiving a document to be printed, said document including a designation of an apparent color shift region within said document, said apparent color shift region comprising a background and a design in a foreground,
• said processor automatically selecting a first color to have a first reflectance property as said background and a second color to have a second reflectance property different from said first reflectance property as said foreground for use in said apparent color shift region,
• said processor automatically controlling a first pixel density of said first color to be less than a second pixel density of said second color within said apparent color shift region,
• said printer printing said document to produce a printed document, and
• said selecting said first color and said second color, and said controlling said first pixel density to be less than said second pixel density causing said second color to have a greater change in brightness appearance relative to a change in brightness appearance of said first color when said printed document is viewed from different angles relative to a light source.