Image forming device and image processing system

Abstract

For obtaining a natural image with certainly providing visibility upon printing, an image forming apparatus includes a data buffer temporarily storing a printing data input through an input terminal, a printing data converting portion active when the description of a character is contained data temporarily stored in the data buffer, for converting the printing data for enhancing visibility of the character, an output terminal for externally outputting the printing data after conversion and a process end signal output terminal for externally outputting a signal when end of printing data is detected by a data end judgment portion.

What is claimed is:  
     
         1 . An image forming apparatus comprising: 
 a data buffer storing an input printing data;    a judgment portion for making judgment whether a define statement of a predetermined character is included in data stored in said data buffer; and    a line screen value converting portion for converting a line screen definition for performing halftone printing of said predetermined character when a define statement of said predetermined character is contained in data stored in said data buffer.    
     
     
         2 . An image forming apparatus as set forth in  claim 1 , wherein said line screen value converting portion comprises: 
 a first information input terminal for receiving input of a value of line screen to be converted;    a second information input terminal receiving an input designating a font size to be conversion object;    a font size comparing portion active when a description of the font size in the data in said data buffer, for comparing the font size with a font size given from said second information input terminal;    a line screen conversion character string storage portion storing an additional character string performing line screen conversion; and    a selector for switching output between input printing data and said line screen conversion character string on the basis of result of judgment in said character string judgment portion and comparison in said font size comparing portion.    
     
     
         3 . An image forming apparatus as set forth in  claim 2 , wherein said line screen value converting portion comprises: 
 a background color information extracting portion for extracting information of a background color from the printing data; and    a line screen value determining portion for determining a line screen value for conversion with taking the extracted background color into account.    
     
     
         4 . An image forming apparatus comprising: 
 a data buffer storing an input printing data;    a character string judgment portion for making judgment whether a define statement of a predetermined character in data stored in said data buffer; and    a color information converting portion for converting a color definition of the character to be printed.    
     
     
         5 . Am image forming apparatus as set forth in  claim 4 , wherein said color information converting portion comprises: 
 a color judgment portion for extracting color information in the data in said data buffer and making judgment whether degradation of visibility can be caused upon gray scale conversion;    a color conversion character string storing portion storing the character string to perform color conversion; and    a selector for switching output between the input printing data and the character string with converted color definition on the basis of result of judgment in said character string judgment portion and comparison in said font size comparing portion.    
     
     
         6 . An image forming apparatus as set forth in  claim 5 , wherein said color information converting portion comprises: 
 a background color information extracting portion for extracting information of the background color from the printing data; and    a color information determining portion for determining color information to be converted on the basis of extracted background color information.    
     
     
         7 . An image forming apparatus comprising: 
 a data buffer temporarily storing a printing data input through an input terminal;    a printing data converting portion active when the description of a character is contained data temporarily stored in said data buffer, for converting said printing data for enhancing visibility of the character;    an output terminal for externally outputting the printing data after conversion; and    a process end signal output terminal for externally outputting a signal when end of printing data is detected by a data end judgment portion.    
     
     
         8 . An image forming apparatus as set forth in  claim 1 , wherein said printing data converting portion comprises: 
 a first information input terminal for receiving input of a value of line screen to be converted;    a second information input terminal receiving an input designating a font size to be conversion object;    a font size comparing portion active when a description of the font size in the data in said data buffer, for comparing the font size with a font size given from said second information input terminal;    a line screen conversion character string storage portion storing an additional character string performing line screen conversion; and    a selector for switching output between input printing data and said line screen conversion character string on the basis of result of judgment in said character string judgment portion and comparison in said font size comparing portion.    
     
     
         9 . An image forming apparatus as set forth in  claim 8 , wherein said line screen value converting portion comprises: 
 a background color information extracting portion for extracting information of a background color from the printing data; and    a line screen value determining portion for determining a line screen value for conversion with taking the extracted background color into account.    
     
     
         10 . Am image forming apparatus as set forth in  claim 4 , wherein said printing data converting portion comprises: 
 a color judgment portion for extracting color information in the data in said data buffer and making judgment whether degradation of visibility can be caused upon gray scale conversion;    a color conversion character string storing portion storing the character string to perform color conversion; and    a selector for switching output between the input printing data and the character string with converted color definition on the basis of result of judgment in said character string judgment portion and comparison in said font size comparing portion.    
     
     
         11 . An image forming apparatus as set forth in  claim 5 , wherein said color information converting portion comprises: 
 a background color information extracting portion for extracting information of the background color from the printing data; and    a color information determining portion for determining color information to be converted on the basis of extracted background color information.    
     
     
         12 . An image processing system comprising: 
 a printer driver converting input image data into a printing data; and    a printer apparatus performing data output using the converted image data, said printer driver including at least said image forming apparatus defined in any one of  claims 1  to  11 .    
     
     
         13 . An image processing system comprising: 
 a printer driver converting input image data into a printing data; and    a printer apparatus performing data output using the converted image data, said printer apparatus including at least said image forming apparatus defined in any one of  claims 1  to  11 .    
     
     
         14 . An image forming method comprising: 
 parsing process for parsing information of an input printing data;    converting process for converting the printing data based on said parsing process; and    output process for outputting on the basis of printing data process through said conversion process.