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ptlycldy99
Participant
November 26, 2018
Answered

How can I get some RGB colors to appear

  • November 26, 2018
  • 1 reply
  • 303 views

I have not been successful in getting certain colors  using  setrgbcolor to appear.  I am trying to get a cream color to show in both GSview and on my printer, and no color appears.  For example, I can not get 238 213 183 setrgbcolor  to yield any color except the white of the screen or the paper.

Are there certain colors that postscript will not handle?

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Correct answer ptlycldy99

I found the answer and am posting it here for other newbies.  The arguments for setrgbcolor  are not in a range of  0 to 255, but rather in a range of 0.0 to 1.0.   You just have to do the math:  take your 255 range number and divide by 255 and use the result as the argument.  Thus the proper result for a cream color would be:  .9255 .8353 .7176 setrgbcolor

I guess the old adage of "read the manual" still applies.

1 reply

P
ptlycldy99AuthorCorrect answer
Participant
November 26, 2018

I found the answer and am posting it here for other newbies.  The arguments for setrgbcolor  are not in a range of  0 to 255, but rather in a range of 0.0 to 1.0.   You just have to do the math:  take your 255 range number and divide by 255 and use the result as the argument.  Thus the proper result for a cream color would be:  .9255 .8353 .7176 setrgbcolor

I guess the old adage of "read the manual" still applies.

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