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How to convert color to black & white

4 messages · OlsenN@pac.dfo-mpo.gc.ca, Uwe Ligges, Muhammad Subianto

OlsenN@pac.dfo-mpo.gc.ca
# 
Muhammad,
Here's one option:

barplot(1:5,col=gray(seq(0,1,length=5)))

Norm Olsen
Fisheries and Oceans Canada

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
To: R-help at stat.math.ethz.ch
Sent: 5/13/2005 11:40 AM
Subject: [R] How to convert color to black & white

Dear all,
Could someone please explain to me how to convert color to black &
white.
For example:
barplot(1:5,col = rainbow(5))
Because I need to print my plot to save my ink color printer.
I don't want to convert to grayscale, but keep it as an RGB.
I  would be very happy if anyone could help me.
Thank you very much in advance.

Kindly regards,
Muhammad Subianto

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2 days later
Muhammad Subianto
# 
Thank's you very much.
But I need the plot with color not gray.

Best wishes,
Muhammad Subianto
On this day 5/14/2005 3:05 AM, OlsenN at pac.dfo-mpo.gc.ca wrote:

            

      
      
      
    

        

      
      
    

  
  


  


      

    

    

      
      

        


  

        

      Uwe Ligges
    

    

      
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Muhammad Subianto wrote:

            

      
      
      
    

        
So you want a colorful rgb plot, OK, fine with your code below.

Now you want to print it black and white: This is now a question for the 
folks who wrote your printer driver, but not for R-help.

Uwe Ligges

            

      
      
      
    

        

      
      
    

            

      
      
      
    

        

      
      
    

  
  


  


      

    

    

      
      

        


  

        

      Muhammad Subianto
    

    

      
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Dear Uwe,
Thank for you advice.
Now, I know how to do with my color printer to print black and white.
James Holtman have advise me about that.
Then I use a simple color like this to use my picture.
print.bw4 <-c(blueF         = "#0000FF",
              redF          = "#FF0000",
              salmon.light  = "#dd9955",
              yellowF       = "#FFFF00")
barplot(1:4,col = print.bw4)

Best,
Muhammad Subianto

        
On this day 5/16/2005 2:42 PM, Uwe Ligges wrote: