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Converting a number to a greyscale color in Java

I'm trying to figure out how I can convert a number between 1 and 50 to a greyscale color that could be used here:

g.setColor(MyGreyScaleColour);

1 would be lightest (white) and 50 would be darkest (black).

e.g.

Color intToCol(int colNum)  
{  
code here  
}  

Any suggestions?

like image 697
Meir Avatar asked Dec 01 '22 05:12

Meir


2 Answers

Java uses RGB colors where each component (Red, Green, Blue) ranges from 0-255. When all components have the same value, you end up with a white-black-gray color. Combinations closer to 255 would be more white and closer to 0 would be all black. The function below would return a grayish color, with the amount of white scaled accordingly with the input.

Color intToCol(int colNum)
{
  int rgbNum = 255 - (int) ((colNum/50.0)*255.0);
  return new Color (rgbNum,rgbNum,rgbNum);
}
like image 198
tschaible Avatar answered Dec 05 '22 09:12

tschaible


Something like:

float grey = (50 - colNum) / 49f;
return new Color(grey, grey, grey);
like image 41
Jon Skeet Avatar answered Dec 05 '22 09:12

Jon Skeet